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php7.3-fpm segfaults


I'm running buster/sid on my notebook and on a desktop pc. I'd like to use both for PHP software development, so I've setup Apache2 and php7.3-fpm to create a devel env similar to the real production servers.

On the destop pc it works. On the notebook it segfaults. Please note that the two systems are not exactly the same, with the notebook being a older debian install, upgraded several releases since the first install.

Here is what i get in the logs:

# cat /var/log/php7.3-fpm.log | tail -n 7
[12-Jan-2019 08:57:36] NOTICE: fpm is running, pid 815
[12-Jan-2019 08:57:36] NOTICE: ready to handle connections
[12-Jan-2019 08:57:36] NOTICE: systemd monitor interval set to 10000ms
[12-Jan-2019 08:59:45] WARNING: [pool lucio] child 1635 exited on signal 11 (SIGSEGV) after 129.612030 seconds from start
[12-Jan-2019 08:59:45] NOTICE: [pool lucio] child 3635 started
[12-Jan-2019 09:09:44] WARNING: [pool lucio] child 3635 exited on signal 11 (SIGSEGV) after 598.434794 seconds from start
[12-Jan-2019 09:09:44] NOTICE: [pool lucio] child 23618 started

The last 2 lines repeat each time I load a page in the browser. The page obviously displays only a "Service Unavailable" message from Apache.

How do I get more details about what's going on with PHP-FPM?