[hwasan] fix pthread_exit

llvm-svn: 341594

compiler-rt/lib/hwasan/hwasan_thread.cc

@@ -44,7 +44,7 @@ void Thread::InsertIntoThreadList(Thread *t) {
 }
 
 void Thread::RemoveFromThreadList(Thread *t) {
-  CHECK_NE(t, main_thread);
+  if (t == main_thread) return;  // Do nothing (happens due to pthread_exit).
   SpinMutexLock l(&thread_list_mutex);
   thread_stats.n_live_threads--;
   thread_stats.total_stack_size -= t->stack_size();

compiler-rt/test/hwasan/TestCases/pthread_exit.c

@@ -0,0 +1,5 @@
+// Tests pthread_exit.
+// RUN: %clang_hwasan %s -o %t && %run %t
+// REQUIRES: stable-runtime
+#include <pthread.h>
+int main() { pthread_exit(NULL); }