[Sun Feb 01 11:39:32.464302 2015] [mpm_prefork:notice] [pid 14428] AH00171: Graceful restart requested, doing restart
[Sun Feb 01 11:39:32.475487 2015] [core:trace3] [pid 14428] core.c(3051): Setting LogLevel for all modules to trace8
[Sun Feb 01 11:39:32.502279 2015] [core:notice] [pid 14428] AH00060: seg fault or similar nasty error detected in the parent process
From /var/log/ apache2/ error.log
[Sun Feb 01 11:39:32.464302 2015] [mpm_prefork: notice] [pid 14428] AH00171: Graceful restart requested, doing restart
[Sun Feb 01 11:39:32.475487 2015] [core:trace3] [pid 14428] core.c(3051): Setting LogLevel for all modules to trace8
[Sun Feb 01 11:39:32.502279 2015] [core:notice] [pid 14428] AH00060: seg fault or similar nasty error detected in the parent process