diff options
author | Dmitry Vyukov <dvyukov@google.com> | 2014-04-25 08:21:30 +0000 |
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committer | Dmitry Vyukov <dvyukov@google.com> | 2014-04-25 08:21:30 +0000 |
commit | 2a10d45fc5321f31c5a0cb8ccf8e17c5d2a67ed2 (patch) | |
tree | 97dcc561ac3314b58491159cb504fb816ea363db /lib/tsan/rtl/tsan_rtl_mutex.cc | |
parent | 087f9f66700726d1f4e6a70cdac3b9202c857f9f (diff) |
tsan: improve "read unlock of a write locked mutex" report
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207208 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/tsan/rtl/tsan_rtl_mutex.cc')
-rw-r--r-- | lib/tsan/rtl/tsan_rtl_mutex.cc | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/lib/tsan/rtl/tsan_rtl_mutex.cc b/lib/tsan/rtl/tsan_rtl_mutex.cc index 4f6a2d09b..ae6e4f798 100644 --- a/lib/tsan/rtl/tsan_rtl_mutex.cc +++ b/lib/tsan/rtl/tsan_rtl_mutex.cc @@ -249,18 +249,32 @@ void MutexReadUnlock(ThreadState *thr, uptr pc, uptr addr) { SyncVar *s = ctx->synctab.GetOrCreateAndLock(thr, pc, addr, true); thr->fast_state.IncrementEpoch(); TraceAddEvent(thr, thr->fast_state, EventTypeRUnlock, s->GetId()); + bool report_bad_unlock = false; if (s->owner_tid != SyncVar::kInvalidTid) { - Printf("ThreadSanitizer WARNING: read unlock of a write locked mutex %p\n", - addr); - PrintCurrentStack(thr, pc); + if (flags()->report_mutex_bugs && !s->is_broken) { + s->is_broken = true; + report_bad_unlock = true; + } } ReleaseImpl(thr, pc, &s->read_clock); if (flags()->detect_deadlocks && s->recursion == 0) { Callback cb(thr, pc); ctx->dd->MutexBeforeUnlock(&cb, &s->dd, false); } + u64 mid = s->GetId(); s->mtx.Unlock(); - thr->mset.Del(s->GetId(), false); + // Can't touch s after this point. + thr->mset.Del(mid, false); + if (report_bad_unlock) { + ThreadRegistryLock l(ctx->thread_registry); + ScopedReport rep(ReportTypeMutexBadReadUnlock); + rep.AddMutex(mid); + StackTrace trace; + trace.ObtainCurrent(thr, pc); + rep.AddStack(&trace); + rep.AddLocation(addr, 1); + OutputReport(ctx, rep); + } if (flags()->detect_deadlocks) { Callback cb(thr, pc); ReportDeadlock(thr, pc, ctx->dd->GetReport(&cb)); |