1 files changed, 36 insertions, 0 deletions
diff --git a/lib/tsan/lit_tests/mop_with_offset.cc b/lib/tsan/lit_tests/mop_with_offset.cc
new file mode 100644
index 000000000000..0c11ef6b9187
--- /dev/null
+++ b/lib/tsan/lit_tests/mop_with_offset.cc
@@ -0,0 +1,36 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+
+void *Thread1(void *x) {
+  int *p = (int*)x;
+  p[0] = 1;
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  sleep(1);
+  char *p = (char*)x;
+  p[2] = 1;
+  return NULL;
+}
+
+int main() {
+  int *data = new int(42);
+  fprintf(stderr, "ptr1=%p\n", data);
+  fprintf(stderr, "ptr2=%p\n", (char*)data + 2);
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, data);
+  pthread_create(&t[1], NULL, Thread2, data);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  delete data;
+}
+
+// CHECK: ptr1=[[PTR1:0x[0-9,a-f]+]]
+// CHECK: ptr2=[[PTR2:0x[0-9,a-f]+]]
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 1 at [[PTR2]] by thread T2:
+// CHECK:   Previous write of size 4 at [[PTR1]] by thread T1: