Bug #79755 [Fbk->NoF]: 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: php-bugs@lists.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: Feedback +Status: No Feedback Type: Bug Package: Scripting Engine problem Operating System: Windows PHP Version: 7.4.7 Assigned To: cmb Private report: N New Comment: No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Re-Opened". Thank you. Previous Comments: ------------------------------------------------------------------------ [2020-06-30 10:50:24] cmb@php.net 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> ------------------------------------------------------------------------ [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