[compiler-rt] r317363 - Correct detection of a thread termination
Kamil Rytarowski via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 3 13:48:19 PDT 2017
Author: kamil
Date: Fri Nov 3 13:48:19 2017
New Revision: 317363
URL: http://llvm.org/viewvc/llvm-project?rev=317363&view=rev
Log:
Correct detection of a thread termination
Summary:
Stop using the Linux solution with pthread_key_create(3).
This approach does not work on NetBSD, because calling
the thread destructor is not the latest operation on a POSIX
thread entity. NetBSD's libpthread still calls at least
pthread_mutex_lock and pthread_mutex_unlock.
Detect _lwp_exit(2) call as it is really the latest operation
called from a detaching POSIX thread.
This resolves one set of crashes observed in
the Thread Sanitizer execution.
Sponsored by <The NetBSD Foundation>
Reviewers: joerg, kcc, vitalybuka, dvyukov, eugenis
Reviewed By: vitalybuka
Subscribers: llvm-commits, kubamracek, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D39618
Modified:
compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc
Modified: compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc?rev=317363&r1=317362&r2=317363&view=diff
==============================================================================
--- compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc (original)
+++ compiler-rt/trunk/lib/tsan/rtl/tsan_interceptors.cc Fri Nov 3 13:48:19 2017
@@ -265,7 +265,7 @@ static ThreadSignalContext *SigCtx(Threa
return ctx;
}
-#if !SANITIZER_MAC
+#if !SANITIZER_MAC && !SANITIZER_NETBSD
static unsigned g_thread_finalize_key;
#endif
@@ -869,7 +869,7 @@ void DestroyThreadState() {
}
} // namespace __tsan
-#if !SANITIZER_MAC
+#if !SANITIZER_MAC && !SANITIZER_NETBSD
static void thread_finalize(void *v) {
uptr iter = (uptr)v;
if (iter > 1) {
@@ -899,7 +899,7 @@ extern "C" void *__tsan_thread_start_fun
ThreadState *thr = cur_thread();
// Thread-local state is not initialized yet.
ScopedIgnoreInterceptors ignore;
-#if !SANITIZER_MAC
+#if !SANITIZER_MAC && !SANITIZER_NETBSD
ThreadIgnoreBegin(thr, 0);
if (pthread_setspecific(g_thread_finalize_key,
(void *)GetPthreadDestructorIterations())) {
@@ -2448,6 +2448,17 @@ TSAN_INTERCEPTOR(void *, __tls_get_addr,
}
#endif
+#if SANITIZER_NETBSD
+TSAN_INTERCEPTOR(void, _lwp_exit) {
+ SCOPED_TSAN_INTERCEPTOR(_lwp_exit);
+ REAL(_lwp_exit)();
+ DestroyThreadState();
+}
+#define TSAN_MAYBE_INTERCEPT__LWP_EXIT TSAN_INTERCEPT(_lwp_exit)
+#else
+#define TSAN_MAYBE_INTERCEPT__LWP_EXIT
+#endif
+
namespace __tsan {
static void finalize(void *arg) {
@@ -2616,6 +2627,8 @@ void InitializeInterceptors() {
TSAN_INTERCEPT(__tls_get_addr);
#endif
+ TSAN_MAYBE_INTERCEPT__LWP_EXIT;
+
#if !SANITIZER_MAC && !SANITIZER_ANDROID
// Need to setup it, because interceptors check that the function is resolved.
// But atexit is emitted directly into the module, so can't be resolved.
@@ -2627,7 +2640,7 @@ void InitializeInterceptors() {
Die();
}
-#if !SANITIZER_MAC
+#if !SANITIZER_MAC && !SANITIZER_NETBSD
if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
Printf("ThreadSanitizer: failed to create thread key\n");
Die();
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