https://github.com/vitalybuka updated https://github.com/llvm/llvm-project/pull/228794
>From b8cc242bf96eb036f42c58c3d3c256897cb9be72 Mon Sep 17 00:00:00 2001 From: Vitaly Buka <[email protected]> Date: Sat, 3 Oct 2026 15:11:02 -0700 Subject: [PATCH] [NFC][TSan] Move ObtainCurrentStack out of ThreadRegistryLock scope ObtainCurrentStack only reads the current thread's shadow stack and allocates a VarSizeStackTrace buffer, which does not require ThreadRegistryLock (and already runs outside ThreadRegistryLock in ReportRace, SignalUnsafeCall, ReportErrnoSpoiling, and ReportDestroyLocked). Move ObtainCurrentStack (and dummy_pc in ReportDeadlock) before ScopedReport in ReportMutexHeldWrongContext, ReportMutexMisuse, and ReportDeadlock so the stack trace buffers also outlive ScopedReport and OutputReport. Assisted-by: Gemini Pull Request: https://github.com/llvm/llvm-project/pull/228794 --- compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp | 4 ++-- compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp b/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp index e280f5b91b61d..11311ce8e901f 100644 --- a/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp +++ b/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp @@ -441,6 +441,8 @@ void __tsan_mutex_post_divert(void *addr, unsigned flagz) { } static void ReportMutexHeldWrongContext(ThreadState *thr, uptr pc) { + VarSizeStackTrace trace; + ObtainCurrentStack(thr, pc, &trace); ScopedReport rep(ReportTypeMutexHeldWrongContext); // Release locks before symbolizing and outputting the report to avoid // deadlocks. @@ -450,8 +452,6 @@ static void ReportMutexHeldWrongContext(ThreadState *thr, uptr pc) { MutexSet::Desc desc = thr->mset.Get(i); rep.AddMutex(desc.addr, desc.stack_id); } - VarSizeStackTrace trace; - ObtainCurrentStack(thr, pc, &trace); rep.AddStack(trace, true); } OutputReport(thr, rep); diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp b/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp index 47dd013b7bf86..8ae9c1f4b20e9 100644 --- a/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp +++ b/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp @@ -55,14 +55,14 @@ static void ReportMutexMisuse(ThreadState *thr, uptr pc, ReportType typ, return; if (!ShouldReport(thr, typ)) return; + VarSizeStackTrace trace; + ObtainCurrentStack(thr, pc, &trace); ScopedReport rep(typ); // Release locks before symbolizing and outputting the report to avoid // deadlocks. { ThreadRegistryLock l(&ctx->thread_registry); rep.AddMutex(addr, creation_stack_id); - VarSizeStackTrace trace; - ObtainCurrentStack(thr, pc, &trace); rep.AddStack(trace, true); rep.AddLocation(addr, 1); } @@ -532,6 +532,7 @@ void AfterSleep(ThreadState *thr, uptr pc) { void ReportDeadlock(ThreadState *thr, uptr pc, DDReport *r) { if (r == 0 || !ShouldReport(thr, ReportTypeDeadlock)) return; + uptr dummy_pc = 0x42; ScopedReport rep(ReportTypeDeadlock); // Release locks before symbolizing and outputting the report to avoid // deadlocks. @@ -542,7 +543,6 @@ void ReportDeadlock(ThreadState *thr, uptr pc, DDReport *r) { rep.AddUniqueTid((int)r->loop[i].thr_ctx); rep.AddThread((int)r->loop[i].thr_ctx); } - uptr dummy_pc = 0x42; for (int i = 0; i < r->n; i++) { for (int j = 0; j < (flags()->second_deadlock_stack ? 2 : 1); j++) { u32 stk = r->loop[i].stk[j]; _______________________________________________ llvm-branch-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
