1 files changed, 41 insertions, 0 deletions
diff --git a/lib/tsan/lit_tests/fd_stdout_race.cc b/lib/tsan/lit_tests/fd_stdout_race.cc
new file mode 100644
index 000000000000..6581fc503a1b
--- /dev/null
+++ b/lib/tsan/lit_tests/fd_stdout_race.cc
@@ -0,0 +1,41 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int X;
+
+void *Thread1(void *x) {
+  sleep(1);
+  int f = open("/dev/random", O_RDONLY);
+  char buf;
+  read(f, &buf, 1);
+  close(f);
+  X = 42;
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  X = 43;
+  write(STDOUT_FILENO, "a", 1);
+  return NULL;
+}
+
+int main() {
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 4
+// CHECK:     #0 Thread1
+// CHECK:   Previous write of size 4
+// CHECK:     #0 Thread2
+
+