[release/10.0] Clear TS_GCSuspendRedirected at the end of thread redirection#119168
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jeffschwMSFT merged 1 commit intorelease/10.0from Aug 28, 2025
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TS_GCSuspendRedirected is normally cleared in the slow path of pulsing GC mode (RareDisablePreemptiveGC). The problem is that we may not even get to that slow path if the thread gets rescheduled right after we switch to preemptive mode and gets scheduled back only after the GC completes and resumes execution. This change clears it explicitly. Fixes #119149
mangod9
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Aug 28, 2025
jeffschwMSFT
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Aug 28, 2025
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approved. we can merge when ready
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Backport of #119164 to release/10.0
/cc @jkotas
Customer Impact
Intermittent hang during GC suspension on machines under heavy load running Windows 10 era OSes.
Regression
.NET 8 -> .NET 9 regression introduced by #101782.
Testing
CI tests
Risk
Low
IMPORTANT: If this backport is for a servicing release, please verify that:
release/X.0-staging, notrelease/X.0.Package authoring no longer needed in .NET 9
IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.
Keep in mind that we still need package authoring in .NET 8 and older versions.