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

[Andreas Roussos]

Hi Michael,

> 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)

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

HTH,
Andreas