compiler-rt/test/tsan/free_race2.c

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 // RUN: %clang_tsan -O1 -DACCESS_OFFSET=4 %s -o %t && %deflake %run %t | FileCheck %s
   3 #include <stdlib.h>
   4
   5 #ifndef ACCESS_OFFSET
   6 #define ACCESS_OFFSET 0
   7 #endif
   8
   9 __attribute__((noinline)) void foo(void *mem) {
  10   free(mem);
  11 }
  12
  13 __attribute__((noinline)) void baz(void *mem) {
  14   free(mem);
  15 }
  16
  17 __attribute__((noinline)) void bar(void *mem) {
  18   *(long*)((char*)mem + ACCESS_OFFSET) = 42;
  19 }
  20
  21 int main() {
  22   void *mem = malloc(100);
  23   baz(mem);
  24   mem = malloc(100);
  25   foo(mem);
  26   bar(mem);
  27   return 0;
  28 }
  29
  30 // CHECK: WARNING: ThreadSanitizer: heap-use-after-free
  31 // CHECK:   Write of size {{.*}} at {{.*}} by main thread:
  32 // CHECK:     #0 bar
  33 // CHECK:     #1 main
  34 // CHECK:   Previous write of size 8 at {{.*}} by main thread:
  35 // CHECK:     #0 free
  36 // CHECK:     #{{1|2}} foo
  37 // CHECK:     #{{2|3}} main