1 files changed, 74 insertions, 0 deletions
diff --git a/test/tsan/signal_reset.cc b/test/tsan/signal_reset.cc
new file mode 100644
index 000000000000..aec98dc399e9
--- /dev/null
+++ b/test/tsan/signal_reset.cc
@@ -0,0 +1,74 @@
+// 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;
+int stop;
+
+static void handler(int sig) {
+  (void)sig;
+  if (X != 0)
+    printf("bad");
+}
+
+static void* busy(void *p) {
+  while (__atomic_load_n(&stop, __ATOMIC_RELAXED) == 0) {
+  }
+  return 0;
+}
+
+static void* reset(void *p) {
+  struct sigaction act = {};
+  for (int i = 0; i < 1000000; i++) {
+    act.sa_handler = &handler;
+    if (sigaction(SIGPROF, &act, 0)) {
+      perror("sigaction");
+      exit(1);
+    }
+    act.sa_handler = SIG_IGN;
+    if (sigaction(SIGPROF, &act, 0)) {
+      perror("sigaction");
+      exit(1);
+    }
+  }
+  return 0;
+}
+
+int main() {
+  struct sigaction act = {};
+  act.sa_handler = SIG_IGN;
+  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);
+  }
+
+  pthread_t th[2];
+  pthread_create(&th[0], 0, busy, 0);
+  pthread_create(&th[1], 0, reset, 0);
+
+  pthread_join(th[1], 0);
+  __atomic_store_n(&stop, 1, __ATOMIC_RELAXED);
+  pthread_join(th[0], 0);
+
+  fprintf(stderr, "DONE\n");
+  return 0;
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer:
+// CHECK: DONE
+// CHECK-NOT: WARNING: ThreadSanitizer: