| // RUN: %clangxx_asan -O0 -mllvm -asan-instrument-allocas %s -o %t | 
 | // RUN: not %run %t 2>&1 | FileCheck %s | 
 | // | 
 |  | 
 | #include <assert.h> | 
 |  | 
 | __attribute__((noinline)) void foo(int index, int len) { | 
 |   volatile char str[len] __attribute__((aligned(32))); | 
 |   assert(!(reinterpret_cast<long>(str) & 31L)); | 
 |   str[index] = '1'; // BOOM | 
 | // CHECK: ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]] | 
 | // CHECK: WRITE of size 1 at [[ADDR]] thread T0 | 
 | } | 
 |  | 
 | int main(int argc, char **argv) { | 
 |   foo(33, 10); | 
 |   return 0; | 
 | } |