[browser][mt] Release all proxies of C# and JS objects on WebWorker

[pavelsavara]

• all proxies are disposed at the end of the WebWorker lifetime. All proxies would throw if used.
• internal withInteropCleanupOnExit could turn on proxy disposal at the exit of program, for non MT build too.
  • Added to test-main.js
• more asserts for thread affinity and disposed objects
• s_gcHandleFromJSOwnedObject renamed to ThreadJsOwnedObjects and made ThreadStatic for MT
• dropped locks for ThreadJsOwnedObjects
• UninstallWebWorkerInterop will now dispose all proxies together with forceDisposeProxies on JS side
• mono_wasm_pthread_on_pthread_detached will assertNoProxies for all threads
• added proxy_debug_symbol to all proxies in Debug build of the runtime, for easier diagnostics
• "OperationCanceledException" throwed on JS side is now new Error not just string.
• forceDisposeProxies is on INTERNAL and is tested after each method of JSImportExportTest. We also have "keep" property on proxy which will keep it alive anyway, only good for testing.
• no longer proxy of globalThis can't be disposed from JSHandle.

Fixes#86039
Fixes#88057

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Issue Details

---

Fixes #86039

Author:	pavelsavara
Assignees:	pavelsavara
Labels:	arch-wasm, area-System.Runtime.InteropServices.JavaScript
Milestone:	8.0.0

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelsavara]

I wonder if the runtime already shut down when the timeout callback fired.

Yes, this is on worker after main thread already called mono_exit

[lambdageek]

Yes, this is on worker after main thread already called mono_exit

Ah ok. does mono_exit actually tell the runtime that things are shutting down? Do we end up calling mono_runtime_try_shutdown or System.Environment.Exit or mono_thread_manage_internal or anything like that?

If it does get called then probably the most straightforward thing is to add if (shutting_down) return; near the beginning of thread_detach.

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelsavara]

does mono_exit actually tell the runtime that things are shutting down?

we call mono_wasm_exit ->mono_jit_cleanup -> mono_thread_manage_internal -> mono_runtime_try_shutdown -> mono_threads_set_shutting_down -> shutting_down = TRUE;

If it does get called then probably the most straightforward thing is to add if (shutting_down) return; near the beginning of thread_detach.

There is mono_gc_thread_detach in thread_detach and I worry that GC could be blocked waiting on the thread to unregister.

[pavelsavara]

we call mono_wasm_exit

No we don't call it. We call mono_exit which is JS only thing.

[lambdageek]

There is mono_gc_thread_detach in thread_detach and I worry that GC could be blocked waiting on the thread to unregister.

Are you saying you worry that if we exit early from thread_detach then the GC would wait forever for the dead thread?
I don't think that will happen for two reasons:

1. There shouldn't be any more GCs once we're shutting_down
2. The GC iterates over MonoThreadInfo* info structures, which is cleaned up by unregister_thread, not by mono_thread_detach_internal. mono_thread_detach_internal is primarily about cleaning up the managed therad object. The GC doesn't look at that one - it should be pretty safe to bypass that stuff if managed code can't be running anymore.

[pavelsavara]

I'm exploring alternate exit strategy here #88387

[pavelsavara]

NodeJS strange exit, non-MT

[11:57:48] info: === TEST EXECUTION SUMMARY ===
[11:57:48] info: Total: 446, Errors: 0, Failed: 12, Skipped: 87, Time: 35.1668852s
[11:57:48] info: [11:57:48] info: MONO_WASM: {"name":"ExitStatus","message":"Program terminated with exit(1)","status":1}
[11:57:48] info: Process node exited with 1

Log

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelsavara]

CI failure is #88900

[pavelsavara]

Example how proxies are disposed on unit tests.
[10:36:43] info: MONO_WASM: forceDisposeProxies done: 19 imports, 0 exports, 7 GCHandles, 2 JSHandles.

[10:36:43] info: Finished: System.Net.Http.Functional.Tests.dll
[10:36:43] info: [10:36:43] info: === TEST EXECUTION SUMMARY ===
[10:36:43] info: Total: 800, Errors: 0, Failed: 0, Skipped: 86, Time: 11.3293999s
[10:36:43] info: [10:36:43] info: Received expected 406821 of C:\helix\work\workitem\uploads\xharness-output\testResults.xml
[10:36:43] info: Finished writing 406821 bytes of RESULTXML
[10:36:43] info: Xml file was written to the provided writer.
[10:36:43] info: Tests run: 800 Passed: 714 Inconclusive: 0 Failed: 0 Ignored: 0 Skipped: 86
[10:36:43] info: test-main.js exiting WasmTestRunner.dll System.Net.Http.Functional.Tests.dll with result 0
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 678 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 1142 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 1158 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 1222 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 1302 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# function with GCHandle 566 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of C# object with GCHandle 662 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of JS object with JSHandle 36 was still alive. disposing.
[10:36:43] warn: MONO_WASM: Proxy of JS object with JSHandle 73 was still alive. disposing.
[10:36:43] info: MONO_WASM: forceDisposeProxies done: 19 imports, 0 exports, 7 GCHandles, 2 JSHandles.
[10:36:43] fail: MONO_WASM: Assert failed: mono runtime already exited with 0
[10:36:43] info: WASM EXIT 0

Log

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

No commit pushedDate could be found for PR 88052 in repo dotnet/runtime

[pavelsavara]

/azp run runtime-wasm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[pavelsavara]

Unrelated AOT failure Log

is #89398

[18:12:23] info: Starting: System.Runtime.CompilerServices.Unsafe.Tests.dll
[18:12:23] info: Error: [MONO] /__w/1/s/src/mono/mono/metadata/object.c:926 <disabled>
[18:12:23] info: at at (/root/helix/work/workitem/e/wasm_build/AppBundle/_framework/dotnet.runtime.js:3:18041)
[18:12:23] info: at it (/root/helix/work/workitem/e/wasm_build/AppBundle/_framework/dotnet.runtime.js:3:18298)
[18:12:23] info: at wasm_trace_logger (wasm_trace_logger (wasm://wasm/0854332a:wasm-function[55016]:0xae04cc))
[18:12:23] info: at eglib_log_adapter (eglib_log_adapter (wasm://wasm/0854332a:wasm-function[42767]:0x8cc6d1))
[18:12:23] info: at monoeg_g_logv_nofree (monoeg_g_logv_nofree (wasm://wasm/0854332a:wasm-function[42640]:0x8c80bb))
[18:12:23] info: at monoeg_g_log (monoeg_g_log (wasm://wasm/0854332a:wasm-function[42642]:0x8c818b))
[18:12:23] info: at g_log_disabled (g_log_disabled (wasm://wasm/0854332a:wasm-function[42643]:0x8c81c1))
[18:12:23] info: at compute_class_bitmap (compute_class_bitmap (wasm://wasm/0854332a:wasm-function[45972]:0x975581))
[18:12:23] info: at mono_class_compute_gc_descriptor (mono_class_compute_gc_descriptor (wasm://wasm/0854332a:wasm-function[45970]:0x9750d5))
[18:12:23] info: at instantiate_info (instantiate_info (wasm://wasm/0854332a:wasm-function[47390]:0x9bd144))
[18:12:23] info: at mini_instantiate_gshared_info (mini_instantiate_gshared_info (wasm://wasm/0854332a:wasm-function[47389]:0x9bd002))
[18:12:23] info: at mini_init_method_rgctx (mini_init_method_rgctx (wasm://wasm/0854332a:wasm-function[47172]:0x9ab48b))
[18:12:23] info: at aot_instances_System_Runtime_CompilerServices_UnsafeTests__WriteUnaligned_ByRef_StructManagedg__Write_56_0_T_INST_byte__T_INST (aot_instances_System_Runtime_CompilerServices_UnsafeTests__WriteUnaligned_ByRef_StructManagedg__Write_56_0_T_INST_byte__T_INST (wasm://wasm/0854332a:wasm-function[29876]:0x5da7a8))
[18:12:23] info: at System_Runtime_CompilerServices_Unsafe_Tests_System_Runtime_CompilerServices_UnsafeTests_WriteUnaligned_ByRef_StructManaged (System_Runtime_CompilerServices_Unsafe_Tests_System_Runtime_CompilerServices_UnsafeTests_WriteUnaligned_ByRef_StructManaged (wasm://wasm/0854332a:wasm-f

[pavelsavara]

ENOENT: no such file or directory, open 'http://127.0.0.1:46507/' is #88900, Log

[pavelsavara]

Timeout of AOT Microsoft.Extensions.Options.SourceGeneration.Unit.TestsLog

Is #89402