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 char buf[16];
9 volatile int nreport;
10
__sanitizer_report_error_summary(const char * summary)11 void __sanitizer_report_error_summary(const char *summary) {
12 nreport++;
13 }
14
15 const int kEventPCBits = 61;
16
__tsan_symbolize_external(unsigned long pc,char * func_buf,unsigned long func_siz,char * file_buf,unsigned long file_siz,int * line,int * col)17 extern "C" bool __tsan_symbolize_external(unsigned long pc, char *func_buf,
18 unsigned long func_siz,
19 char *file_buf,
20 unsigned long file_siz, int *line,
21 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
Thread(void * arg)29 void *Thread(void *arg) {
30 barrier_wait(&barrier);
31 memset(buf, 2, sizeof(buf));
32 return 0;
33 }
34
main()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: WARNING: ThreadSanitizer: data race
51 // CHECK: Write of size 8 at {{.*}} by thread T1:
52 // CHECK: #0 Thread
53