free_race2.c   [plain text]

// RUN: %clang_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
#include <stdlib.h>

void __attribute__((noinline)) foo(int *mem) {
  free(mem);
}

void __attribute__((noinline)) bar(int *mem) {
  mem[0] = 42;
}

int main() {
  int *mem = (int*)malloc(100);
  foo(mem);
  bar(mem);
  return 0;
}

// CHECK: WARNING: ThreadSanitizer: heap-use-after-free
// CHECK:   Write of size 4 at {{.*}} by main thread:
// CHECK:     #0 bar
// CHECK:     #1 main
// CHECK:   Previous write of size 8 at {{.*}} by main thread:
// CHECK:     #0 free
// CHECK:     #1 foo
// CHECK:     #2 main