Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/thread_leak5.c

@@ -0,0 +1,22 @@
+// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include "test.h"
+
+void *Thread(void *x) {
+  barrier_wait(&barrier);
+  return 0;
+}
+
+int main() {
+  volatile int N = 5;  // prevent loop unrolling
+  barrier_init(&barrier, N + 1);
+  for (int i = 0; i < N; i++) {
+    pthread_t t;
+    pthread_create(&t, 0, Thread, 0);
+  }
+  barrier_wait(&barrier);
+  sleep(1);  // wait for the threads to finish and exit
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: thread leak
+// CHECK:   And 4 more similar thread leaks