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On a Linux system with apache2 are several vhosts served.

Some weeks ago there was for the first time messages in /var/log/httpd/error_log like

[Wed Jun 26 10:09:29 2013] [notice] child pid 9841 exit signal Segmentation fault (11)
[Wed Jun 26 10:09:29 2013] [notice] child pid 9846 exit signal Segmentation fault (11)
[Wed Jun 26 10:09:29 2013] [notice] child pid 9996 exit signal Segmentation fault (11)
[Wed Jun 26 10:09:29 2013] [notice] child pid 9998 exit signal Segmentation fault (11)
[Wed Jun 26 10:09:29 2013] [notice] child pid 10127 exit signal Segmentation fault (11)

Only one vhost is effected when that happens. That particular vhost is an up-to-date wordpress site.

During outage serves Apache still static content for that vhost and also for other vhost completely (static and dynamic content).

Recovery is done by /etc/init.d/httpd reload.

There is APC, Alternative PHP Cache, in use. Even months before the first segfault occured.

A websearch learnt me to enable core dumping. But I'm afraid that my server will collapse while writing core files.

What options do I have to pin-out what causes these segfaults?

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Check apache's access.log and error.log for the affected virtualhost. –  blau Jun 27 '13 at 12:34
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