1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
2 #include "../test.h"
3 #include <memory.h>
4 
5 // A reproducer for a known issue.
6 // See reference to double_race.cpp in tsan_rtl_report.cpp for an explanation.
7 
8 long long buf[2];
9 volatile int nreport;
10 
11 __attribute__((disable_sanitizer_instrumentation)) void
12 __sanitizer_report_error_summary(const char *summary) {
13   nreport++;
14 }
15 
16 const int kEventPCBits = 61;
17 
18 extern "C" __attribute__((disable_sanitizer_instrumentation)) bool
19 __tsan_symbolize_external(unsigned long pc, char *func_buf,
20                           unsigned long func_siz, char *file_buf,
21                           unsigned long file_siz, int *line, int *col) {
22   if (pc >> kEventPCBits) {
23     printf("bad PC passed to __tsan_symbolize_external: %lx\n", pc);
24     _exit(1);
25   }
26   return true;
27 }
28 
29 void *Thread(void *arg) {
30   barrier_wait(&barrier);
31   memset(buf, 2, sizeof(buf));
32   return 0;
33 }
34 
35 int main() {
36   barrier_init(&barrier, 2);
37   pthread_t t;
38   pthread_create(&t, 0, Thread, 0);
39   memset(buf, 1, sizeof(buf));
40   barrier_wait(&barrier);
41   pthread_join(t, 0);
42   return 0;
43 }
44 
45 // CHECK: WARNING: ThreadSanitizer: data race
46 // CHECK:   Write of size 8 at {{.*}} by thread T1:
47 // CHECK:     #0 memset
48 // CHECK:     #{{[12]}} Thread
49 // CHECK-NOT: bad PC passed to __tsan_symbolize_external
50 // CHECK-NOT: __sanitizer_report_error_summary
51 // CHECK-NOT: WARNING: ThreadSanitizer: data race
52