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tsan: improve "read unlock of a write locked mutex" report 

llvm-svn: 207208
This commit is contained in:
Dmitry Vyukov 2014-04-25 08:21:30 +00:00
parent 66dbbbc47b
commit e296164f77
4 changed files with 41 additions and 4 deletions
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2
compiler-rt/lib/tsan/rtl/tsan_report.cc
View File

@ -78,6 +78,8 @@ static const char *ReportTypeString(ReportType typ) {
return "double lock of a mutex";
if (typ == ReportTypeMutexBadUnlock)
return "unlock of an unlocked mutex (or by a wrong thread)";
if (typ == ReportTypeMutexBadReadUnlock)
return "read unlock of a write locked mutex";
if (typ == ReportTypeSignalUnsafe)
return "signal-unsafe call inside of a signal";
if (typ == ReportTypeErrnoInSignal)

1
compiler-rt/lib/tsan/rtl/tsan_report.h
View File

@ -26,6 +26,7 @@ enum ReportType {
ReportTypeMutexDestroyLocked,
ReportTypeMutexDoubleLock,
ReportTypeMutexBadUnlock,
ReportTypeMutexBadReadUnlock,
ReportTypeSignalUnsafe,
ReportTypeErrnoInSignal,
ReportTypeDeadlock

22
compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cc
View File

@ -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));

20
compiler-rt/test/tsan/mutex_bad_read_unlock.cc Normal file
View File

@ -0,0 +1,20 @@
// RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
extern "C" void AnnotateRWLockAcquired(const char *f, int l, void *m, long rw);
extern "C" void AnnotateRWLockReleased(const char *f, int l, void *m, long rw);
int main() {
int m = 0;
AnnotateRWLockAcquired(__FILE__, __LINE__, &m, 1);
AnnotateRWLockReleased(__FILE__, __LINE__, &m, 0);
return 0;
}
// CHECK: WARNING: ThreadSanitizer: read unlock of a write locked mutex
// CHECK: #0 AnnotateRWLockReleased
// CHECK: #1 main
// CHECK: Location is stack of main thread.
// CHECK: Mutex {{.*}}) created at:
// CHECK: #0 AnnotateRWLockAcquired
// CHECK: #1 main
// CHECK: SUMMARY: ThreadSanitizer: read unlock of a write locked mutex