I applied SLES/OES updates on June 1 to my SLES 11 SP4 / OES 2015 SP1 server. Since that time I have had problems with iPrint failing. After some troubleshooting, the problem appears to be that Apache dies. Looking at the apache error_log file I see:

[Fri Jun 02 16:15:01 2017] [notice] Graceful restart requested, doing restart
[Fri Jun 02 16:15:02 2017] [notice] seg fault or similar nasty error detected in the parent process ALL Simias Threads are stopped, Exiting from Simias process

After that, nothing happens until I restart apache. When I do, I get the message on the console:

Warning: found stale pidfile (unclean shutdown?)
Starting httpd2 (prefork) [Tue Jun 06 07:39:33 2017] [warn] module rewrite_module is already loaded, skipping
[Tue Jun 06 07:39:33 2017] [warn] module rewrite_module is already loaded, skipping

Then apache seems to run for a while and then die again. What is causing this? How do I troubleshoot it?

Thanks,
Dan