compiler-rt/test/tsan/free_race.c

   1 // RUN: %clang_tsan -O1 %s -o %t
   2 // RUN: %deflake %run %t | FileCheck %s --check-prefix=CHECK-NOZUPP
   3 // RUN: %env_tsan_opts=suppressions='%s.supp':print_suppressions=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUPP
   4
   5 #include "test.h"
   6
   7 int *mem;
   8 pthread_mutex_t mtx;
   9
  10 void *Thread1(void *x) {
  11   pthread_mutex_lock(&mtx);
  12   free(mem);
  13   pthread_mutex_unlock(&mtx);
  14   barrier_wait(&barrier);
  15   return NULL;
  16 }
  17
  18 __attribute__((noinline)) void *Thread2(void *x) {
  19   barrier_wait(&barrier);
  20   pthread_mutex_lock(&mtx);
  21   mem[0] = 42;
  22   pthread_mutex_unlock(&mtx);
  23   return NULL;
  24 }
  25
  26 int main() {
  27   barrier_init(&barrier, 2);
  28   mem = (int*)malloc(100);
  29   pthread_mutex_init(&mtx, 0);
  30   pthread_t t;
  31   pthread_create(&t, NULL, Thread1, NULL);
  32   Thread2(0);
  33   pthread_join(t, NULL);
  34   pthread_mutex_destroy(&mtx);
  35   return 0;
  36 }
  37
  38 // CHECK-NOZUPP: WARNING: ThreadSanitizer: heap-use-after-free
  39 // CHECK-NOZUPP:   Write of size 4 at {{.*}} by main thread{{.*}}:
  40 // CHECK-NOZUPP:     #0 Thread2
  41 // CHECK-NOZUPP:     #1 main
  42 // CHECK-NOZUPP:   Previous write of size 8 at {{.*}} by thread T1{{.*}}:
  43 // CHECK-NOZUPP:     #0 free
  44 // CHECK-NOZUPP:     #{{(1|2)}} Thread1
  45 // CHECK-NOZUPP: SUMMARY: ThreadSanitizer: heap-use-after-free{{.*}}Thread2
  46 // CHECK-SUPP:   ThreadSanitizer: Matched 1 suppressions
  47 // CHECK-SUPP:    1 race:^Thread2$