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      1 // RUN: %clangxx_asan -O0 -mllvm -asan-instrument-allocas %s -o %t
      2 // RUN: not %run %t 2>&1 | FileCheck %s
      3 //
      4 
      5 #include <assert.h>
      6 
      7 __attribute__((noinline)) void foo(int index, int len) {
      8   volatile char str[len] __attribute__((aligned(32)));
      9   assert(!(reinterpret_cast<long>(str) & 31L));
     10   str[index] = '1'; // BOOM
     11 // CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
     12 // CHECK: WRITE of size 1 at [[ADDR]] thread T0
     13 }
     14 
     15 int main(int argc, char **argv) {
     16   foo(10, 10);
     17   return 0;
     18 }
     19