--- /dev/null
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <errno.h>
+
+volatile int X;
+
+static void handler(int sig) {
+ (void)sig;
+ if (X != 0)
+ printf("bad");
+}
+
+static void* thr(void *p) {
+ return 0;
+}
+
+int main() {
+ struct sigaction act = {};
+ act.sa_handler = &handler;
+ if (sigaction(SIGPROF, &act, 0)) {
+ perror("sigaction");
+ exit(1);
+ }
+
+ itimerval t;
+ t.it_value.tv_sec = 0;
+ t.it_value.tv_usec = 10;
+ t.it_interval = t.it_value;
+ if (setitimer(ITIMER_PROF, &t, 0)) {
+ perror("setitimer");
+ exit(1);
+ }
+
+ for (int i = 0; i < 10000; i++) {
+ pthread_t th;
+ pthread_create(&th, 0, thr, 0);
+ pthread_join(th, 0);
+ }
+
+ fprintf(stderr, "DONE\n");
+ return 0;
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer:
+// CHECK: DONE
+// CHECK-NOT: WARNING: ThreadSanitizer: