1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
2 #include "test.h"
3 #include <stdint.h>
4 #include <errno.h>
5 #include <sys/mman.h>
6
7 // Test for issue:
8 // https://github.com/google/sanitizers/issues/412
9
10 // MAP_32BIT flag for mmap is supported only for x86_64.
11 // XFAIL: target=mips{{.*}}
12 // XFAIL: target=aarch64{{.*}}
13 // XFAIL: target=powerpc64{{.*}}
14 // XFAIL: target=s390x{{.*}}
15 // XFAIL: target=loongarch64{{.*}}
16 // XFAIL: target=riscv64{{.*}}
17
18 // MAP_32BIT doesn't exist on OS X and NetBSD.
19 // UNSUPPORTED: darwin,target={{.*netbsd.*}}
20
Thread(void * ptr)21 void *Thread(void *ptr) {
22 *(int*)ptr = 42;
23 barrier_wait(&barrier);
24 return 0;
25 }
26
main()27 int main() {
28 barrier_init(&barrier, 2);
29 void *ptr = mmap(0, 128 << 10, PROT_READ|PROT_WRITE,
30 MAP_32BIT|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
31 fprintf(stderr, "ptr=%p\n", ptr);
32 if (ptr == MAP_FAILED) {
33 fprintf(stderr, "mmap failed: %d\n", errno);
34 return 1;
35 }
36 if ((uintptr_t)ptr >= (1ull << 32)) {
37 fprintf(stderr, "ptr is too high\n");
38 return 1;
39 }
40 pthread_t t;
41 pthread_create(&t, 0, Thread, ptr);
42 barrier_wait(&barrier);
43 *(int*)ptr = 42;
44 pthread_join(t, 0);
45 munmap(ptr, 128 << 10);
46 fprintf(stderr, "DONE\n");
47 }
48
49 // CHECK: WARNING: ThreadSanitizer: data race
50 // CHECK: DONE
51