1 files changed, 40 insertions, 0 deletions
diff --git a/test/tsan/fork_multithreaded3.cc b/test/tsan/fork_multithreaded3.cc
new file mode 100644
index 0000000000000..a651b3c18b4e7
--- /dev/null
+++ b/test/tsan/fork_multithreaded3.cc
@@ -0,0 +1,40 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+static void *racer(void *p) {
+  *(int*)p = 42;
+  return 0;
+}
+
+int main() {
+  switch (fork()) {
+  default:  // parent
+    while (wait(0) < 0) {}
+    break;
+  case 0:  // child
+    {
+      int x = 0;
+      pthread_t th1, th2;
+      pthread_create(&th1, 0, racer, &x);
+      pthread_create(&th2, 0, racer, &x);
+      pthread_join(th1, 0);
+      pthread_join(th2, 0);
+      exit(0);
+      break;
+    }
+  case -1:  // error
+    fprintf(stderr, "failed to fork (%d)\n", errno);
+    exit(1);
+  }
+  fprintf(stderr, "OK\n");
+}
+
+// CHECK: ThreadSanitizer: data race
+// CHECK: OK
+