Make sure all new GCDacVars are reported only for v2 - #90043

Merged
cshung merged 1 commit into
dotnet:mainfrom
cshung:public/fix-dac-vars
Aug 4, 2023
Merged

Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom
cshung:public/fix-dac-vars

Conversation

@cshung

@cshungcshung commented Aug 4, 2023•
edited
Loading

Copy link
Copy Markdown
Contributor

In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.

In particular, this line:

gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:

GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung self-assigned this Aug 4, 2023
@ghost

ghost commented Aug 4, 2023

Copy link
Copy Markdown

Tagging subscribers to this area: @dotnet/gc
See info in area-owners.md if you want to be subscribed.

Issue Details

In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.

Author:cshung
Assignees:cshung
Labels:

area-GC-coreclr

Milestone:-

Maoni0
Maoni0 approved these changes Aug 4, 2023
View reviewed changes

@Maoni0Maoni0 left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!

@mrsharm

mrsharm commented Aug 4, 2023

Copy link
Copy Markdown
Member

Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.

@mangod9

mangod9 commented Aug 4, 2023

Copy link
Copy Markdown
Member

@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.

@cshung
cshung merged commit 25f2f62 into dotnet:mainAug 4, 2023
@cshung
cshung deleted the public/fix-dac-vars branch August 4, 2023 22:53
@mrsharm

mrsharm commented Aug 5, 2023•
edited
Loading

Copy link
Copy Markdown
Member

@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).

Steps

  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.

@ghostghost locked as resolved and limited conversation to collaborators Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub. Already have an account? Sign in.

Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0

, '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); }
})();
})();

Skip to content
Make sure all new GCDacVars are reported only for v2 - #90043
Merged
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Aug 4, 2023
Merged
Make sure all new GCDacVars are reported only for v2#90043
cshung merged 1 commit into
dotnet:mainfrom 
cshung:public/fix-dac-vars
Conversation
@cshung
@cshungcshung
commented
Aug 4, 2023•

edited

Loading

Copy link


Copy Markdown

Contributor
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
In particular, this line:
gcDacVars->global_free_huge_regions = reinterpret_cast<dac_region_free_list**>(&gc_heap::global_free_huge_regions);

, which should not be run on .NET 6, is accidentally overwriting the variable g_sw_ww_table defined below:
GcDacVars g_gc_dac_vars;
GPTR_IMPL(GcDacVars, g_gcDacGlobals);
#ifdef FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP
uint8_t* g_sw_ww_table = nullptr;
bool g_sw_ww_enabled_for_gc_heap = false;

That leads the write-barrier to write to a bad location and got AV with this output (The user program is a the simple HelloWorld template):
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryInsert(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo, System.Collections.Generic.InsertionBehavior)
at System.Collections.Generic.Dictionary`2[[System.ReadOnlyMemory`1[[System.Char, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.ConsoleKeyInfo, System.Console, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].set_Item(System.ReadOnlyMemory`1<Char>, System.ConsoleKeyInfo)
at System.ConsolePal+TerminalFormatStrings..ctor(Database)
at System.ConsolePal+TerminalFormatStrings+<>c.<.cctor>b__28_0()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Value()
at System.ConsolePal+TerminalFormatStrings.get_Instance()
at System.ConsolePal.EnsureInitializedCore()
at System.ConsolePal.Write(Microsoft.Win32.SafeHandles.SafeFileHandle, System.ReadOnlySpan`1<Byte>, Boolean)
at System.ConsolePal+UnixConsoleStream.Write(System.ReadOnlySpan`1<Byte>)
at System.IO.StreamWriter.Flush(Boolean, Boolean)
at System.IO.StreamWriter.WriteLine(System.String)
at System.IO.TextWriter+SyncTextWriter.WriteLine(System.String)
at System.Console.WriteLine(System.String)
at Program.<Main>$(System.String[])
Aborted

@cshungcshung
self-assigned this
Aug 4, 2023
@ghost
ghost
commented
Aug 4, 2023

Copy link


Copy Markdown

Tagging subscribers to this area: @dotnet/gc

See info in area-owners.md if you want to be subscribed.
Issue Details
In my earlier PR #88457, I missed a few extra fields in the GcDacVars population which should be v2 as well. This is causing a crash on Linux when a .NET 8 clrgc with regions turned on is loaded in a .NET 6 process.
Author:cshung
Assignees:cshung
Labels:
area-GC-coreclr
Milestone:-
Maoni0
Maoni0
approved these changes
Aug 4, 2023
View reviewed changes
@Maoni0Maoni0
left a comment


Copy link


Copy Markdown

Member
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

LGTM!
@mrsharm
mrsharm
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
Adding setting the GCName as libclrgcexp built from .NET8 Release in .NET6 and .NET7 works successfully on a simple GCPerfSim scenario.
@mangod9
mangod9
commented
Aug 4, 2023

Copy link


Copy Markdown

Member
@mrsharm, can you ascertain whether clrgc with regions was actually working with 6? From looking at the change seems like it should be failing too.
@cshung
cshung
merged commit 25f2f62
into
dotnet:mainAug 4, 2023
@cshung
cshung
deleted the

public/fix-dac-vars

branch
August 4, 2023 22:53
@mrsharm
mrsharm
commented
Aug 5, 2023•

edited

Loading

Copy link


Copy Markdown

Member
@mangod9, yes, this seems to be working with libclrgc.so (which, is regions for 6.0).
Steps
  1. Checkout 3b204ac.
  2. Build GCPerfSim for .NET 6.
  3. Create a Corerun using 3b204ac.
  4. export DOTNET_GCName=libclrgc.so
  5. Invoke: ~/runtime/artifacts/tests/coreclr/Linux.x64.Debug/Tests/Core_Root/corerun /home/mrsharm/performance/artifacts/bin/GCPerfSim/Release/net6.0/GCPerfSim.dll -tc 18 -tagb 100 -tlgb 2 -lohar 0 -pohar 0 -sohsr 100-4000 -lohsr 102400-204800 -pohsr 100-204800 -sohsi 50 -lohsi 0 -pohsi 0 -sohpi 0 -lohpi 0 -sohfi 0 -lohfi 0 -pohfi 0 -allocType reference -testKind time
  6. The repro doesn't fail on initialize as before.
@ghostghost
locked as resolved and limited conversation to collaborators
Sep 4, 2023
Sign up for freeto subscribe to this conversation on GitHub.
Already have an account?
Sign in.


Reviewers

@Maoni0Maoni0Maoni0 approved these changes
@mrsharmmrsharmmrsharm approved these changes

Assignees

@cshungcshung

Labels

area-GC-coreclr

Projects


None yet


Milestone


No milestone


Development

Successfully merging this pull request may close these issues.

4 participants

@cshung@mrsharm@mangod9@Maoni0