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[release/10.0] Implement out-of-process SetThreadContext support for debugger detach - #119904
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…er creation and desctruction and DispatchPatchOrSingleStep
…Controller creation and desctruction and DispatchPatchOrSingleStep" This reverts commit 367c638.
This reverts commit 240b372.
This reverts commit d80b6c4.
Debugger events are tracked out of process to determine which threads have outstanding SetThreadContextNeeded flares
…eadContextNeeded for improved readability
…lable on the platform
JulieLeeMSFT
commented
Sep 19, 2025
Member
Please get code review and check test pipelines. |
JulieLeeMSFT
approved these changes
Sep 19, 2025
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Tagging subscribers to this area: @steveisok, @dotnet/dotnet-diag |
tommcdon
commented
Sep 19, 2025
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noahfalk
approved these changes
Sep 19, 2025
JulieLeeMSFT
commented
Sep 19, 2025
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CC @jeffschwMSFT. |
agocke
commented
Sep 22, 2025
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/ba-g android failure is unrelated |
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Backport of #118849 to release/10.0
/cc @tommcdon
Customer Impact
Fixes customer reported issue #116870 in .NET 10
.NET support for CET was enabled by default in .NET 9, which uses out-of-process SetThreadContext in the debugger.. If there are any outstanding debug events in the application at detach, then the app could crash with an 0x80000003 exit code.
Regression
Customers that have CET-enabled hardware will see this issue when upgrading from a previous version of .NET 8 to .NET 9/10.
Testing
Visual Studio debugger testing
Risk
Low - the code changes are primarily designed to only impact detach. There was some refactoring in the out-of-process SetThreadContext but we have extensively tested the change.