I have Apache 2.4 set up on a VPS serving 2 virtual hosts (one http and one https) for the same domain. Everything seems to be working fine except for these consistent lines in my apache error log (different pid's of course):
[mpm_itk:error] [pid 31830] child died with signal 11
These mpm_itk errors seem to occur in groups of 5 or 6 roughly every hour and every so often this happens:
[Fri Aug 07 06:25:14.440874 2015] [mpm_prefork:notice] [pid 470] AH00171: Graceful restart requested, doing restart [Fri Aug 07 06:25:14.513782 2015] [mpm_prefork:notice] [pid 470] AH00163: Apache/2.4.10 (Debian) mpm-itk/2.4.7-02 OpenSSL/1.0.1k configured — resuming normal operations
Both Apache modules mpm_itk and mpm_prefork are enabled in my settings (or is this a problem in itself?).I am wondering if it is safe just to disable mpm_itk and restart Apache? Its a live ecommerce site and I need to be sure before I do anything that may make the problem worse. If anyone has any advice how to safely proceed it would be greatly appreciated.
Ok, I have disabled mpm_itk and restarted apache using mpm_prefork. The "mpm_itk errors" are now gone but I am getting these core notices instead :"AH00052: child pid xxxxx exit signal Segmentation fault (11)". Does anyone know what I should be looking at to finally fix this?