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
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