tsan: don't pass bogus PCs to __tsan_symbolize_external

See the added comment for an explanation.

Reviewed in https://reviews.llvm.org/D37107



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@311768 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 52 insertions, 0 deletions

diff --git a/test/tsan/double_race.cc b/test/tsan/double_race.cc
new file mode 100644
index 000000000..76b017428
--- /dev/null
+++ b/test/tsan/double_race.cc
@@ -0,0 +1,52 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
+#include "test.h"
+#include <memory.h>
+
+// A reproducer for a known issue.
+// See reference to double_race.cc in tsan_rtl_report.cc for an explanation.
+
+char buf[16];
+volatile int nreport;
+
+void __sanitizer_report_error_summary(const char *summary) {
+  nreport++;
+}
+
+const int kEventPCBits = 61;
+
+extern "C" bool __tsan_symbolize_external(unsigned long pc, char *func_buf,
+                                          unsigned long func_siz,
+                                          char *file_buf,
+                                          unsigned long file_siz, int *line,
+                                          int *col) {
+  if (pc >> kEventPCBits) {
+    printf("bad PC passed to __tsan_symbolize_external: %lx\n", pc);
+    _exit(1);
+  }
+  return true;
+}
+
+void *Thread(void *arg) {
+  barrier_wait(&barrier);
+  memset(buf, 2, sizeof(buf));
+  return 0;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  pthread_t t;
+  pthread_create(&t, 0, Thread, 0);
+  memset(buf, 1, sizeof(buf));
+  barrier_wait(&barrier);
+  pthread_join(t, 0);
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 8 at {{.*}} by thread T1:
+// CHECK:     #0 memset
+// CHECK:     #1 Thread
+// CHECK-NOT: bad PC passed to __tsan_symbolize_external
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 8 at {{.*}} by thread T1:
+// CHECK:     #0 Thread