PHP-FPM 8.2 SIGSEGV

[jruston]

Description

I am encountering an issue where very rarely, one of the child processes of PHP-FPM crashes like this:

[13-Oct-2024 21:37:31] WARNING: [pool www] child 3668047 exited on signal 11 (SIGSEGV) after 6678.827466 seconds from start

When this happens, not only does the child process exit, but PHP-FPM stops responding to all requests completely. This creates a massive server load as the requests are queued indefinitely, and is only resolved by restarting the PHP-FPM service.

I have periodically experienced this in various versions of PHP 8.2, including in the current 8.2.24.

PHP Version

PHP 8.2.24

Operating System

AlmaLinux 8.9

[devnexen]

Hi and thanks for your report, would you be able to provide a backtrace ? e.g. attaching gdb to the relevant process then typing bt full.

$ gdb -p <fpm process id>
<requests>
(gdb) <crash>
(gdb) bt full