1 // RUN: %clangxx_tsan -O1 %s -o %t
2 // `handle_sigbus=0` is required because when the rdar://problem/58789439 bug was
3 // present TSan's runtime could derefence bad memory leading to SIGBUS being raised.
4 // If the signal was caught TSan would deadlock because it would try to run the
5 // symbolizer again.
6 // RUN: %env_tsan_opts=handle_sigbus=0,symbolize=1 %run %t 2>&1 | FileCheck %s
7 // RUN: %env_tsan_opts=handle_sigbus=0,symbolize=1 __check_mach_ports_lookup=some_value %run %t 2>&1 | FileCheck %s
8 #include <sanitizer/common_interface_defs.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11
12 const char *kEnvName = "__UNLIKELY_ENV_VAR_NAME__";
13
main()14 int main() {
15 if (getenv(kEnvName)) {
16 fprintf(stderr, "Env var %s should not be set\n", kEnvName);
17 abort();
18 }
19
20 // This will set an environment variable that isn't already in
21 // the environment array. This will cause Darwin's Libc to
22 // malloc() a new array.
23 if (setenv(kEnvName, "some_value", /*overwrite=*/1)) {
24 fprintf(stderr, "Failed to set %s \n", kEnvName);
25 abort();
26 }
27
28 // rdar://problem/58789439
29 // Now trigger symbolization. If symbolization tries to call
30 // to `setenv` that adds a new environment variable, then Darwin
31 // Libc will call `realloc()` and TSan's runtime will hit
32 // an assertion failure because TSan's runtime uses a different
33 // allocator during symbolization which leads to `realloc()` being
34 // called on a pointer that the allocator didn't allocate.
35 //
36 // CHECK: #{{[0-9]}} main {{.*}}no_call_setenv_in_symbolize.cpp:[[@LINE+1]]
37 __sanitizer_print_stack_trace();
38
39 // CHECK: DONE
40 fprintf(stderr, "DONE\n");
41
42 return 0;
43 }
44