1 files changed, 29 insertions, 0 deletions
diff --git a/test/tsan/race_on_fputs.cc b/test/tsan/race_on_fputs.cc
new file mode 100644
index 000000000..53042e3d3
--- /dev/null
+++ b/test/tsan/race_on_fputs.cc
@@ -0,0 +1,29 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include "test.h"
+
+char s[] = "abracadabra";
+
+void *Thread0(void *p) {
+  fputs(s, stdout);
+  barrier_wait(&barrier);
+  return 0;
+}
+
+void *Thread1(void *p) {
+  barrier_wait(&barrier);
+  s[3] = 'z';
+  return 0;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  pthread_t th[2];
+  pthread_create(&th[0], 0, Thread0, 0);
+  pthread_create(&th[1], 0, Thread1, 0);
+  pthread_join(th[0], 0);
+  pthread_join(th[1], 0);
+  fprintf(stderr, "DONE");
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK: DONE