Using EventListener to listen on TplEventSource can result in a deadlock #45571

Closed
Closed
Using EventListener to listen on TplEventSource can result in a deadlock#45571
Assignees
sywhang
Labels
area-Tracing-coreclrbug
Milestone
6.0.0

Description

@sywhang
sywhang
opened on Dec 3, 2020

EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.

When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.

For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.

An example of this can be seen in the callstack below:

Thread 1:

06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

Thread 2:

09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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    Skip to content
    Using EventListener to listen on TplEventSource can result in a deadlock #45571
    Closed
    Closed
    Using EventListener to listen on TplEventSource can result in a deadlock#45571
    Assignees
    sywhang
    Labels
    area-Tracing-coreclrbug
    Milestone
    6.0.0
    Description
    @sywhang
    sywhang
    opened on Dec 3, 2020
    EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
    When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
    For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
    An example of this can be seen in the callstack below:
    Thread 1:
    06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

    Thread 2:
    09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      Using EventListener to listen on TplEventSource can result in a deadlock #45571
      Closed
      Closed
      Using EventListener to listen on TplEventSource can result in a deadlock#45571
      Assignees
      sywhang
      Labels
      area-Tracing-coreclrbug
      Milestone
      6.0.0
      Description
      @sywhang
      sywhang
      opened on Dec 3, 2020
      EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
      When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
      For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
      An example of this can be seen in the callstack below:
      Thread 1:
      06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

      Thread 2:
      09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        Using EventListener to listen on TplEventSource can result in a deadlock #45571
        Closed
        Closed
        Using EventListener to listen on TplEventSource can result in a deadlock#45571
        Assignees
        sywhang
        Labels
        area-Tracing-coreclrbug
        Milestone
        6.0.0
        Description
        @sywhang
        sywhang
        opened on Dec 3, 2020
        EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
        When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
        For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
        An example of this can be seen in the callstack below:
        Thread 1:
        06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

        Thread 2:
        09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

        Metadata
        Metadata
        Assignees
        Labels
        area-Tracing-coreclrbug
        Type
        No type
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          None yet
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          Using EventListener to listen on TplEventSource can result in a deadlock #45571
          Closed
          Closed
          Using EventListener to listen on TplEventSource can result in a deadlock#45571
          Assignees
          sywhang
          Labels
          area-Tracing-coreclrbug
          Milestone
          6.0.0
          Description
          @sywhang
          sywhang
          opened on Dec 3, 2020
          EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
          When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
          For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
          An example of this can be seen in the callstack below:
          Thread 1:
          06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

          Thread 2:
          09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            Using EventListener to listen on TplEventSource can result in a deadlock #45571
            Closed
            Closed
            Using EventListener to listen on TplEventSource can result in a deadlock#45571
            Assignees
            sywhang
            Labels
            area-Tracing-coreclrbug
            Milestone
            6.0.0
            Description
            @sywhang
            sywhang
            opened on Dec 3, 2020
            EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
            When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
            For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
            An example of this can be seen in the callstack below:
            Thread 1:
            06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

            Thread 2:
            09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

            Metadata
            Metadata
            Assignees
            Labels
            area-Tracing-coreclrbug
            Type
            No type
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            No projects
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              None yet
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              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Using EventListener to listen on TplEventSource can result in a deadlock #45571
              Closed
              Closed
              Using EventListener to listen on TplEventSource can result in a deadlock#45571
              Assignees
              sywhang
              Labels
              area-Tracing-coreclrbug
              Milestone
              6.0.0
              Description
              @sywhang
              sywhang
              opened on Dec 3, 2020
              EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
              When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
              For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
              An example of this can be seen in the callstack below:
              Thread 1:
              06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

              Thread 2:
              09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                Using EventListener to listen on TplEventSource can result in a deadlock #45571
                Closed
                Closed
                Using EventListener to listen on TplEventSource can result in a deadlock#45571
                Assignees
                sywhang
                Labels
                area-Tracing-coreclrbug
                Milestone
                6.0.0
                Description
                @sywhang
                sywhang
                opened on Dec 3, 2020
                EventListener and TplEventSource with managed threadpool doesn't seem to play nicely together.
                When an EventListener tries to enable TplEventSource while TplEventSource is being created, it's possible for that to deadlock with EventListnersLock + a lock within the runtime / user-defined lock in EventListener instance.
                For example, a thread can try to initialize TplEventSource (which tries to grab the EventListener lock in EventSource ctor) while holding the AppDomain class init lock while another thread that's enabling EventListener for TplEventSource tries to start the Task for dispatching the events to EventListeners which then tries to get the AppDomain class init lock while holding the EventListener lock.
                An example of this can be seen in the callstack below:
                Thread 1:
                06 00000034`41f7b910 00007ff8`04c33d01 coreclr!CrstBase::Enter+0x26b [F:\workspace\_work\1\s\src\coreclr\src\vm\crst.cpp @ 327] 07 00000034`41f7b980 00007ff8`04d941e0 coreclr!ListLockEntryBase<void *>::FinishDeadlockAwareEnter+0x21 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 209] 08 (Inline Function) --------`-------- coreclr!ListLockEntryBase<void *>::LockHolder::DeadlockAwareAcquire+0x34 [F:\workspace\_work\1\s\src\coreclr\src\vm\listlock.h @ 234] 09 00000034`41f7b9b0 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x2f0 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3316] 0a 00000034`41f7c5a0 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 0b 00000034`41f7c6f0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 0c 00000034`41f7ca90 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 0d 00000034`41f7cc70 00007ff8`0475719a coreclr!DelayLoad_Helper+0x7a
0e 00000034`41f7cd30 00007ff8`04756a11 System_Private_CoreLib!System.Threading.Tasks.Task.ScheduleAndStart(Boolean)+0xea [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1671] 0f 00000034`41f7cd90 00007ff8`04863e77 System_Private_CoreLib!System.Threading.Tasks.Task.InternalStartNew(System.Threading.Tasks.Task, System.Delegate, System.Object, System.Threading.CancellationToken, System.Threading.Tasks.TaskScheduler, System.Threading.Tasks.TaskCreationOptions, System.Threading.Tasks.InternalTaskOptions)+0x71 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs @ 1148] 10 00000034`41f7ce10 00007ff8`04863d11 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.StartDispatchTask()+0x127 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 148] 11 00000034`41f7cf00 00007ff8`048639e6 System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.CommitDispatchConfiguration()+0x1e1 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 135] 12 00000034`41f7d000 00007ff8`04873e5c System_Private_CoreLib!System.Diagnostics.Tracing.EventPipeEventDispatcher.SendCommand(System.Diagnostics.Tracing.EventListener, System.Diagnostics.Tracing.EventCommand, Boolean, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0xc6 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs @ 59] 13 00000034`41f7d060 00007ff8`04873dc1 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords, System.Collections.Generic.IDictionary`2<System.String,System.String>)+0x8c [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3881] 14 00000034`41f7d0e0 00007ff7`a5827f01 System_Private_CoreLib!System.Diagnostics.Tracing.EventListener.EnableEvents(System.Diagnostics.Tracing.EventSource, System.Diagnostics.Tracing.EventLevel, System.Diagnostics.Tracing.EventKeywords)+0x11 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 3853] 15 00000034`41f7d110 000001d3`d53d9ce0 BinderTracingTest_ResolutionFlow!Unknown+0x61

                Thread 2:
                09 00000034`42a3ce80 00007ff8`04fa7a3b coreclr!AwareLock::Enter+0x20f [F:\workspace\_work\1\s\src\coreclr\src\vm\syncblk.cpp @ 2403] 0a (Inline Function) --------`-------- coreclr!Object::EnterObjMonitor+0x9 [F:\workspace\_work\1\s\src\coreclr\src\vm\object.h @ 277] 0b 00000034`42a3cf70 00007ff8`04fae250 coreclr!JIT_MonEnter_Helper+0x157 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3665] 0c 00000034`42a3d190 00007ff8`0486bb41 coreclr!JIT_MonReliableEnter_Portable+0x560 [F:\workspace\_work\1\s\src\coreclr\src\vm\jithelpers.cpp @ 3713] 0d 00000034`42a3d3d0 00007ff8`04767385 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.Initialize(System.Guid, System.String, System.String[])+0x201 [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1490] 0e 00000034`42a3d470 00007ff8`04768127 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..ctor()+0xd5 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 51] 0f 00000034`42a3d4e0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.Tasks.TplEventSource..cctor()+0x17 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TplEventSource.cs @ 48] 10 00000034`42a3d510 00007ff8`04e8a447 coreclr!CallDescrWorkerInternal+0x83
11 00000034`42a3d550 00007ff8`04e89f48 coreclr!`DispatchCallDebuggerWrapper'::`6'::__Body::Run+0x7b [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 160] 12 00000034`42a3d5a0 00007ff8`04e8a0e0 coreclr!DispatchCallDebuggerWrapper+0x20 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 164] 13 00000034`42a3d600 00007ff8`04da64a7 coreclr!DispatchCallSimple+0x148 [F:\workspace\_work\1\s\src\coreclr\src\vm\callhelpers.cpp @ 222] 14 00000034`42a3d730 00007ff8`04d942b7 coreclr!MethodTable::RunClassInitEx+0x483 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3154] 15 00000034`42a3d990 00007ff8`04d8ff15 coreclr!MethodTable::DoRunClassInitThrowing+0x3c7 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3341] 16 00000034`42a3e580 00007ff8`04dd22f4 coreclr!MethodTable::CheckRunClassInitThrowing+0x3b5 [F:\workspace\_work\1\s\src\coreclr\src\vm\methodtable.cpp @ 3481] 17 00000034`42a3e6d0 00007ff8`04dd900b coreclr!DynamicHelperFixup+0xb2c [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3234] 18 00000034`42a3ea70 00007ff8`0527e8da coreclr!DynamicHelperWorker+0x1ab [F:\workspace\_work\1\s\src\coreclr\src\vm\prestub.cpp @ 3542] 19 00000034`42a3ec50 00007ff8`0485f30e coreclr!DelayLoad_Helper+0x7a
1a 00000034`42a3ed10 00007ff8`0486b08f System_Private_CoreLib!System.Diagnostics.Tracing.ActivityTracker.OnStart(System.String, System.String, Int32, System.Guid ByRef, System.Guid ByRef, System.Diagnostics.Tracing.EventActivityOptions, Boolean)+0x6e [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs @ 64] 1b 00000034`42a3edc0 00007ff8`0474ca15 System_Private_CoreLib!System.Diagnostics.Tracing.EventSource.WriteEventWithRelatedActivityIdCore(Int32, System.Guid*, Int32, EventData*)+0x17f [/_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventSource.cs @ 1231] 1c 00000034`42a3eef0 00007ff8`0474bdf0 System_Private_CoreLib!System.Threading.PortableThreadPoolEventSource.WriteThreadEvent(Int32, UInt32)+0x95 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPoolEventSource.cs @ 103] 1d 00000034`42a3ef70 00007ff8`0472cdf1 System_Private_CoreLib!System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()+0x90 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs @ 42] 1e 00000034`42a3eff0 00007ff8`04738ed0 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0xa1 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 49] 1f 00000034`42a3f030 00007ff8`0472cf58 System_Private_CoreLib!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x80 [/_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs @ 188] 20 00000034`42a3f0a0 00007ff8`0527d503 System_Private_CoreLib!System.Threading.ThreadHelper.ThreadStart()+0x58 [/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs @ 99] 21 00000034`42a3f0e0 00007ff8`04e89e74 coreclr!CallDescrWorkerInternal+0x83

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