Bug #79755 [Opn->Fbk]: Php process might hang on fatal error if proc from proc_open is not closed

Edit report at https://bugs.php.net/bug.php?id=79755&edit=1 ID: 79755 Updated by: cmb@php.net Reported by: michael dot vorisek at email dot cz Summary: Php process might hang on fatal error if proc from proc_open is not closed -Status: Open +Status: Feedback Type: Bug Package: Scripting Engine problem Operating System: Windows PHP Version: 7.4.7 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Well, without more detailed information this is unlikely to be actionable. I mean there are certainly ways to cause a the parent process to hang, which would not be a bug in PHP, but rather in the userland script, e.g. <?php $descs = [['pipe', 'r'], ['pipe', 'w'], ['pipe', 'w']]; $proc = proc_open('php -r "echo str_repeat(\'*\', 10000);"', $descs, $pipes); set_error_handler(function () use ($pipes) { fwrite($pipes[0], str_repeat('*', 10000)); }); trigger_error('error', E_USER_ERROR); ?> The point is that anonymous pipes are always blocking on Windows, what manifests if there is more data in the pipe than the pipe manager is able to buffer[1]. [1] <https://devblogs.microsoft.com/oldnewthing/20110707-00/?p=10223> Previous Comments: ------------------------------------------------------------------------ [2020-06-28 13:57:51] michael dot vorisek at email dot cz Description: ------------ reproducible with quote complex code on Windows platform with PHP 7.4.7 NTS issue has gone if processes were stopped properly in the script before a fatal error is thrown php code needs to be checked, it seems, that after a fatal error not all child processes are terminated properly Test script: --------------- // start several processes with proc_open and keep them running // now throw some fatal error like with class with invalid method signature // notice, that PHP process will not finish Expected result: ---------------- php process finishes and there are no child processes left Actual result: -------------- php process hang ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79755&edit=1