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(ptr: mem); |
11 | } |
12 | |
13 | __attribute__((noinline)) void baz(void *mem) { |
14 | free(ptr: 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(size: 100); |
23 | baz(mem); |
24 | mem = malloc(size: 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 |
38 | |