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"):
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 -- Geschäftsführer · Diplombibliothekar BBS, Informatiker eidg. Fachausweis Admin Kuhn GmbH · Pappelstrasse 20 · 4123 Allschwil · Schweiz T 0041 (0)61 261 55 61 · E mik@adminkuhn.ch · W www.adminkuhn.ch