1  // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
 2  // RUN:     MSAN_OPTIONS=store_context_size=1 not %run %t 2>&1 | FileCheck %s
 3  
 4  // Test that stack trace for the intermediate store is not empty.
 5  
 6  // CHECK: MemorySanitizer: use-of-uninitialized-value
 7  // CHECK:   #0 {{.*}} in main
 8  
 9  // CHECK: Uninitialized value was stored to memory at
10  // CHECK:   #0 {{.*}} in fn_g
11  // CHECK-NOT: #1
12  
13  // CHECK: Uninitialized value was created by an allocation of 'z' in the stack frame of function 'main'
14  // CHECK:   #0 {{.*}} in main
15  
16  #include <stdio.h>
17  
18  volatile int x;
19  
20  __attribute__((noinline))
21  void fn_g(int a) {
22    x = a;
23  }
24  
25  __attribute__((noinline))
26  void fn_f(int a) {
27    fn_g(a);
28  }
29  
30  int main(int argc, char *argv[]) {
31    int volatile z;
32    fn_f(z);
33    return x;
34  }