I keep getting the follow error in my Apache log:
[Wed Sep 18 17:59:20 2013] [notice] Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.8 with Suhosin-Patch configured
In my case the error appeared, whenever I accessed my site from iOS / MacOS Safari. After the first access from one of those devices, apache kept craching with segmentation faults on any request from any device, until the next restart.
The problem disappeared after disabling Google`s mod_spdy module.