main process exited, code=killed, status=9/KILL

hi
i create a service with php 8.2 on centos 7 64 bit

PHP 8.2.20 (cli) (built: Jun  4 2024 13:22:51) (NTS gcc x86_64)
Copyright (c) The PHP Group
Zend Engine v4.2.20, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.20, Copyright (c), by Zend Technologies

but after some minute or some hour my service stop and i have no error or log to find what happend only main process exited, code=killed, status=9/KILL

i add some memory log and only see

 Memory: 4.00MB / Peak: 4.00MB

<?php
ignore_user_abort(true);
@set_time_limit(0);
error_reporting(E_ALL);
ini_set('display_errors', '1');
ini_set('memory_limit', '-1');
@session_write_close();
gc_enable();
use Revolt\EventLoop;
use function Amp\async;
use function Amp\Future\await;
use Amp\Process\Process;
use function Amp\delay;
try {
    Revolt\EventLoop::setDriver(new Revolt\EventLoop\Driver\EvDriver());
  //  Revolt\EventLoop::setDriver(new Revolt\EventLoop\Driver\UvDriver());
   // Revolt\EventLoop::setDriver(new Revolt\EventLoop\Driver\EventDriver());
} catch (Throwable $e) {
    PrintLog($e->getMessage());//Class "EventBase" not found
}


try{
    Revolt\EventLoop::run();
} catch (Throwable $e) {
    PrintLog("Unhandled exception in EventLoop: " . $e->getMessage());
    PrintLog("File: " . $e->getFile() . ' on line ' . $e->getLine());
    PrintLog("Trace: " . $e->getTraceAsString());
}

in main function i have this

            Amp\async(function () use ($args , $atomicrunningCoroutines,$atomicSendingCoroutines, $pm_pid) {
                try {
                PrintLog( 'add ' . $pm_pid );
                $context = Amp\Parallel\Context\contextFactory()->start(__DIR__ . '/child/sms_send_select.php');
                $context->send($args);

please help me to find what cause exit main process

i check ```
[root@nginx2 davari]# ulimit -n # soft limit (open files)
1024000
[root@nginx2 davari]# ulimit -Hn # hard limit
1024000

Start by reviewing the service configuration and the PHP entry points shown in the report, especially Revolt\EventLoop::run() and the Amp\Parallel context startup. Check the service and system logs for the source of status 9/KILL, then determine whether the failure is reproducible and document the cause and any relevant diagnostic guidance.