1 // RUN: %clangxx_msan -O0 -g %s -o %t && not %run %t
2 //
3 #include <signal.h>
4 #include <assert.h>
5 
6 #include <sanitizer/msan_interface.h>
7 
8 int main(void) {
9   stack_t old_ss;
10 
11   assert(sigaltstack(nullptr, &old_ss) == 0);
12   __msan_check_mem_is_initialized(&old_ss, sizeof(stack_t));
13 
14   stack_t ss;
15   sigaltstack(&ss, nullptr);
16 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
17 // CHECK:    in main {{.*}}sigaltstack.cpp:15
18 
19   return 0;
20 }
21