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Fix NativeAOT GC hang on single-core systems by preventing RT signal queue overflow #121772

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Merged
merged 3 commits into from
Nov 20, 2025
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Merged

Fix NativeAOT GC hang on single-core systems by preventing RT signal queue overflow #121772

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9a15334
Initial plan
Copilot Nov 19, 2025
1cd6434
Fix NativeAOT GC hang by preventing signal queue overflow
Copilot Nov 19, 2025
0894b8b
reset activation pending flag if suspending (in case the signal was l…
VSadov Nov 20, 2025
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3 changes: 3 additions & 0 deletions src/coreclr/nativeaot/Runtime/thread.cpp
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Expand Up @@ -92,6 +92,9 @@ void Thread::WaitForGC(PInvokeTransitionFrame* pTransitionFrame)
ClearState(TSF_Redirected);
#endif //FEATURE_SUSPEND_REDIRECTION

// make sure this is cleared - in case a signal is lost or somehow we did not act on it
SetActivationPending(false);

GCHeapUtilities::GetGCHeap()->WaitUntilGCComplete();

// must be in cooperative mode when checking the trap flag
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5 changes: 5 additions & 0 deletions src/coreclr/nativeaot/Runtime/unix/PalUnix.cpp
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Expand Up @@ -1088,6 +1088,11 @@ HijackFunc* PalGetHijackTarget(HijackFunc* defaultHijackTarget)

void PalHijack(Thread* pThreadToHijack)
{
if (pThreadToHijack->IsActivationPending())
{
return;
}

pThreadToHijack->SetActivationPending(true);

int status = pthread_kill(pThreadToHijack->GetOSThreadHandle(), INJECT_ACTIVATION_SIGNAL);
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