Panic on PHP request startup

[Javdu10]

Hello!

I was happily testing frankenphp, but I figured that sometimes if I run a K6 load test, the docker container crashes and the last message in the console I have is :

panic: error during PHP request startup

goroutine 183 [running, locked to thread]:
github.com/dunglas/frankenphp.go_execute_script(0xc0006e5801?)
        /go/src/app/frankenphp.go:470 +0x2a5

and sometimes :

<br />
<b>Fatal error</b>:  Could not create timer: Resource temporarily unavailable (11) in <b>Unknown</b> on line <b>0</b><br />

K6 script ran with k6 run --vus 10000 --duration 30s script.js

import http from 'k6/http';
import { check } from 'k6';

export default function () {
  let res = http.get('https://xxxxxxx');
  check(res, {
    "is status 200": (r) => r.status === 200
  });
}

I am running the docker container from dunglas/frankenphp:sha-b04326e-php8.2-alpine behind cloudflare tunnels, my /app/public/index.php is :

<?php

use Illuminate\Contracts\Http\Kernel;
use Illuminate\Http\Request;

define('LARAVEL_START', microtime(true));
echo 'hello world';
exit;

During load test the machine seems to be stable in resource usage, then boom

Please let me know if any other information is needed

[dunglas]

System timers used by PHP to handle max_execution_time etc are a limited resource, and it looks like the stress test reached the limit.

Can you try to increase the limit using ulimit -i?

It should also be possible to improve timer management directly in PHP. It's on my todo list!

[Javdu10]

Thank you for your reply, indeed changing to unlimited prevents the container from crashing and sends the container to 100% CPU, requests correcly timeout on the stress test