[Koha] "Segmentation fault (11)" with Apache 2.4.51 on Debian 11

[Michael Kuhn]

Hi Andreas

You wrote:

 >> Has anyone ever seen this before? Can anyone maybe confirm this on
 >> his own host with Debian 11 and Apache 2.4.51?
 >
 > Yes, I've seen this before when I tried to set up a Koha 21.05
 > instance for testing purposes on a Debian 11 VM. I can confirm
 > it is still happening with Koha 21.11.00 on Debian 11.1.0 with
 > Apache 2.4.51-1~deb11u1 and Plack enabled (mod_itk enabled too
 > which is on version 2.4.7-04-1+b1).
 >
 > Sometimes the segmentation faults arrive "in batches" like the
 > 5 entries in the log file below:
 >
 > ==> /var/log/apache2/error.log <==
 > [Fri Dec 10 11:14:02.082457 2021] [core:notice] [pid 1915] AH00052:
 > child pid 2108 exit signal Segmentation fault (11)
 > [Fri Dec 10 11:14:02.082696 2021] [core:notice] [pid 1915] AH00052:
 > child pid 2116 exit signal Segmentation fault (11)
 > [Fri Dec 10 11:14:02.082733 2021] [core:notice] [pid 1915] AH00052:
 > child pid 2120 exit signal Segmentation fault (11)
 > [Fri Dec 10 11:14:02.082760 2021] [core:notice] [pid 1915] AH00052:
 > child pid 2124 exit signal Segmentation fault (11)
 > [Fri Dec 10 11:14:02.082786 2021] [core:notice] [pid 1915] AH00052:
 > child pid 2128 exit signal Segmentation fault (11)

Yes, that's exactly the behaviour. Thanks for confirming it!

 > The following report from the Debian bug tracking system seems
 > to be referring to similar findings:
 >
 > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995961
 >
 > The earliest report of this issue seems to be from Gentoo's Bugzilla:
 >
 > https://bugs.gentoo.org/816258
 >
 > And here's the entry filed upstream (currently in Status "NEW"):
 >
 > https://bz.apache.org/bugzilla/show_bug.cgi?id=65627

Meanwhile via https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256729 I 
had also found https://bz.apache.org/bugzilla/show_bug.cgi?id=65627 and 
I was happy I was not seeing ghosts. Because at first I thought I had 
done something wrong with the configuration.

This output in the logfile looks very ugly but even if this is a severe 
problem with this continued stopping/starting of processes I'm happy 
that the normal user doesn't even notice it is there (as far as I know).

Best wishes: Michael
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