Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117832

tommcdon · 2025-07-18T18:28:01Z

SOS supports a feature that is able to read a serialized exception embedded in a NativeAOT mini-dump, known as !crashinfo. This feature was added in the .NET 8 timeframe, but only worked when executing NativeAOT's internal crash dump code path. #114392 added the ability for hosts to notify the runtime of an impending unhandled exception through the ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent API.

0:000> !crashinfo
Loading extension C:\Program Files\WindowsApps\Microsoft.WinDbg.Fast_1.2507.17002.0_x64__8wekyb3d8bbwe\amd64\winext\sos\extensions\Microsoft.Diagnostics.DataContractReader.dll
Loading extension C:\Program Files\WindowsApps\Microsoft.WinDbg.Fast_1.2507.17002.0_x64__8wekyb3d8bbwe\amd64\winext\sos\extensions\Microsoft.Diagnostics.DataContractReader.Extension.dll
Loading extension C:\Program Files\WindowsApps\Microsoft.WinDbg.Fast_1.2507.17002.0_x64__8wekyb3d8bbwe\amd64\winext\sos\extensions\Microsoft.Diagnostics.DebuggerCommands.dll
CrashReason:        UnhandledException
ThreadId:           F2C4C
HResult:            80131509
RuntimeType:        NativeAOT
RuntimeBaseAddress: 00007FF677250000
RuntimeVersion:     10.0.0-dev
Message:            Recursion complete. Terminating process.

** Current Exception **

-----------------------------------------------
Exception object:   0000025B9C80BDD8
Exception type:     System.InvalidOperationException
HResult:            80131509
Message:            Recursion complete. Terminating process.
StackTrace:
    IP               Function
    00007FF677371CA9 test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x229
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372756 test!Program.<<<Main>$>g__Method5|0_4>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773724A6 test!Program.<<<Main>$>g__Method4|0_3>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773721F6 test!Program.<<<Main>$>g__Method3|0_2>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371F46 test!Program.<<<Main>$>g__Method2|0_1>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371C7B test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x1FB
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372A13 test!Program.<<Main>$>d__0.MoveNext() + 0x203

** Thread 994380 Exception **

-----------------------------------------------
Exception object:   0000025B9C80BDD8
Exception type:     System.InvalidOperationException
HResult:            80131509
Message:            Recursion complete. Terminating process.
StackTrace:
    IP               Function
    00007FF677371CA9 test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x229
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372756 test!Program.<<<Main>$>g__Method5|0_4>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773724A6 test!Program.<<<Main>$>g__Method4|0_3>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773721F6 test!Program.<<<Main>$>g__Method3|0_2>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371F46 test!Program.<<<Main>$>g__Method2|0_1>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371C7B test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x1FB
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372A13 test!Program.<<Main>$>d__0.MoveNext() + 0x203

** Nested Exceptions **

-----------------------------------------------
Exception object:   0000025B9C80BDD8
Exception type:     System.InvalidOperationException
HResult:            80131509
Message:            Recursion complete. Terminating process.
StackTrace:
    IP               Function
    00007FF677371CA9 test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x229
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372756 test!Program.<<<Main>$>g__Method5|0_4>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773724A6 test!Program.<<<Main>$>g__Method4|0_3>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF6773721F6 test!Program.<<<Main>$>g__Method3|0_2>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371F46 test!Program.<<<Main>$>g__Method2|0_1>d.MoveNext() + 0x1F6
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677371C7B test!Program.<<<Main>$>g__Method1|0_0>d.MoveNext() + 0x1FB
    00007FF677307D93 test!System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x33
    00007FF67730D557 test!System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0xE7
    00007FF67730D450 test!System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task, ConfigureAwaitOptions) + 0x80
    00007FF67730D3C2 test!System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task, ConfigureAwaitOptions) + 0x32
    00007FF67730D37D test!System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0x1D
    00007FF677372A13 test!Program.<<Main>$>d__0.MoveNext() + 0x203

…andler.RaiseUnhandledExceptionEvent is called

Copilot

Pull Request Overview

This PR extends the NativeAOT crash dump analysis feature to work with host-notified unhandled exceptions by adding exception serialization when ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent is called. Previously, the SOS !crashinfo command only worked for NativeAOT's internal crash dump code path.

Adds crash info serialization to the OnUnhandledException method in AppContext.cs
Refactors crash info handling in RuntimeExceptionHelpers.cs to enable reuse across different crash scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/libraries/System.Private.CoreLib/src/System/AppContext.cs	Adds call to serialize crash info for unhandled exceptions in NativeAOT builds
src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs	Refactors crash info creation into reusable method and adds thread-safe caching

src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs

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src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs

Co-authored-by: Jan Kotas <[email protected]>

…erialized (prevents early process exit)

src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs

…eExceptionHelpers.cs

src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs

…eExceptionHelpers.cs

jkotas

Thanks

tommcdon · 2025-07-19T13:03:31Z

/ba-g failures are unrelated

…andler.RaiseUnhandledExceptionEvent is called (dotnet#117832) * Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called * Use cheaper locking mechanism for SerializeCrashInfo * Remove superfluous assignment * Apply suggestions from code review Co-authored-by: Jan Kotas <[email protected]> * Block secondary calls to SerializeCrashInfo until the data has been serialized (prevents early process exit) * Update src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs * Update src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs --------- Co-authored-by: Jan Kotas <[email protected]>

…andler.RaiseUnhandledExceptionEvent is called (#117832) (#117913) * Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called * Use cheaper locking mechanism for SerializeCrashInfo * Remove superfluous assignment * Apply suggestions from code review * Block secondary calls to SerializeCrashInfo until the data has been serialized (prevents early process exit) * Update src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs * Update src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs --------- Co-authored-by: Jan Kotas <[email protected]> Co-authored-by: Jeff Schwartz <[email protected]>

SOS supports reading NAOT crash information using a JSON encoding mechanism. The mechanism relies on passing the serialized exception address via a [FailFast exception parameter](https://github.com/dotnet/runtime/blob/67837792faa88beb3f44105dfa7a3a430961ff12/src/coreclr/nativeaot/System.Private.CoreLib/src/System/RuntimeExceptionHelpers.cs#L322-L332) along with a special code. SOS can read this data via `!crashinfo` as well as `!clrma`. As of dotnet/runtime#117832, NAOT can serialize exception data when `ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent` is called. This PR adds the corresponding SOS functionality to locate the [g_CrashInfoBuffer](https://github.com/dotnet/runtime/blob/67837792faa88beb3f44105dfa7a3a430961ff12/src/coreclr/nativeaot/Runtime/DebugHeader.cpp#L261) global as an alternate mechanism in the event the exception does not contain the address of the buffer. Since this requires reading module exports, this change introduces a configurable module enumeration mechanism via the `!crashinfo` command. --------- Co-authored-by: Michal Strehovský <[email protected]>

Serialize unhandled exception for crash dump analysis when ExceptionH…

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…andler.RaiseUnhandledExceptionEvent is called

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Use cheaper locking mechanism for SerializeCrashInfo

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Remove superfluous assignment

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tommcdon and others added 2 commits July 18, 2025 17:49

Apply suggestions from code review

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Co-authored-by: Jan Kotas <[email protected]>

Block secondary calls to SerializeCrashInfo until the data has been s…

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…erialized (prevents early process exit)

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jkotas mentioned this pull request Jul 18, 2025

ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent: Prevent handlers from being invoked multiple times #117840

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tommcdon mentioned this pull request Jul 18, 2025

Add concurrency checks to ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent #117841

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tommcdon enabled auto-merge (squash) July 18, 2025 22:36

This was referenced Jul 19, 2025

The Operation will be canceled. The next steps may not contain expected logs. dotnet/dnceng#3008

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TimeZoneInfoTests.NoBackwardTimeZones tests are failing on Android #117731

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[WASM] Hundreds of tests failing without log #117772

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Merge branch 'main' into dev/tommcdon/aot_crash_diagnostics

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build-analysis bot mentioned this pull request Jul 19, 2025

System.Diagnostics.Tests.ProcessTests.TestCheckChildProcessUserAndGroupIds fails on Alpine jobs with "Operation not permitted" #117811

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tommcdon merged commit ea721e7 into dotnet:main Jul 19, 2025
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AaronRobinsonMSFT mentioned this pull request Jul 19, 2025

Make ExceptionHandling.RaiseAppDomainUnhandledExceptionEvent() thread safe. #117844

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tommcdon mentioned this pull request Jul 22, 2025

[10.0-preview7] Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117913

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tommcdon mentioned this pull request Jul 25, 2025

Support reading naot crashinfo via module export dotnet/diagnostics#5528

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Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117832

Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117832

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Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117832

Serialize unhandled exception for crash dump analysis when ExceptionHandler.RaiseUnhandledExceptionEvent is called #117832

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Pull Request Overview

Reviewed Changes

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