gcc/testsuite/c-c++-common/asan/alloca_safe_access.c

/* { dg-do run } */

#include <assert.h>

__attribute__((noinline)) void foo(int index, int len) {
  volatile char str[len] __attribute__((aligned(32)));
  assert(!((long)str & 31L));
  str[index] = '1';
}

int main(int argc, char **argv) {
  foo(4, 5);
  foo(39, 40);
  return 0;
}