compiler-rt/test/tsan/Linux/double_race.cpp

   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