File: stack-underflow.c

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// RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s

// Stack histories currently are not recorded on x86.
// XFAIL: target=x86_64{{.*}}

__attribute((noinline)) void buggy() {
  char c[64];
  char *volatile p = c;
  p[-2] = 0;
}

int main() {
  buggy();
  // CHECK: WRITE of size 1 at
  // CHECK: #0 {{.*}} in buggy{{.*}}stack-underflow.c:[[@LINE-6]]
  // CHECK: Cause: stack tag-mismatch
  // CHECK: is located in stack of thread
  // CHECK: Potentially referenced stack objects:
  // CHECK: Cause: stack-buffer-overflow
  // CHECK-NEXT: 0x{{.*}} is located 2 bytes before a 64-byte local variable c [0x{{.*}},0x{{.*}}) in buggy {{.*}}stack-underflow.c:
  // CHECK: Memory tags around the buggy address

  // CHECK: SUMMARY: HWAddressSanitizer: tag-mismatch {{.*}} in buggy
}