1 files changed, 26 insertions, 0 deletions
diff --git a/test/tsan/free_race2.c b/test/tsan/free_race2.c
new file mode 100644
index 000000000000..de6b2ae1fcbb
--- /dev/null
+++ b/test/tsan/free_race2.c
@@ -0,0 +1,26 @@
+// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include <stdlib.h>
+
+void __attribute__((noinline)) foo(int *mem) {
+  free(mem);
+}
+
+void __attribute__((noinline)) bar(int *mem) {
+  mem[0] = 42;
+}
+
+int main() {
+  int *mem = (int*)malloc(100);
+  foo(mem);
+  bar(mem);
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: heap-use-after-free
+// CHECK:   Write of size 4 at {{.*}} by main thread:
+// CHECK:     #0 bar
+// CHECK:     #1 main
+// CHECK:   Previous write of size 8 at {{.*}} by main thread:
+// CHECK:     #0 free
+// CHECK:     #{{1|2}} foo
+// CHECK:     #{{2|3}} main