"Segmentation fault (11)" with Apache 2.4.51 on Debian 11
Hi I have the same problem on two different hosts, both use Debian GNU/Linux 11 with Apache HTTP Server 2.4.51. * one is a productive machine using Koha 21.05.02 * the other one is my demo installation using Koha 21.11.00 Both work as you would expect on the surface, but both show lots and lots of lines like the following in logfile "/var/log/apache2/error.log": [Mon Dec 06 22:48:51.598100 2021] [core:notice] [pid 3741] AH00052: child pid 4169 exit signal Segmentation fault (11) [Mon Dec 06 22:48:51.598225 2021] [core:notice] [pid 3741] AH00052: child pid 4170 exit signal Segmentation fault (11) [Mon Dec 06 22:48:51.598262 2021] [core:notice] [pid 3741] AH00052: child pid 4212 exit signal Segmentation fault (11) Even after hours of searching I couldn't find the reason for this behaviour, least of all the solution to it... Has anyone ever seen this before? Can anyone maybe confirm this on his own host with Debian 11 and Apache 2.4.51? 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
Are you using Plack there? Is it all the time? Some pages? El lun., 6 dic. 2021 20:17, Michael Kuhn <mik@adminkuhn.ch> escribió:
Hi
I have the same problem on two different hosts, both use Debian GNU/Linux 11 with Apache HTTP Server 2.4.51.
* one is a productive machine using Koha 21.05.02 * the other one is my demo installation using Koha 21.11.00
Both work as you would expect on the surface, but both show lots and lots of lines like the following in logfile "/var/log/apache2/error.log":
[Mon Dec 06 22:48:51.598100 2021] [core:notice] [pid 3741] AH00052: child pid 4169 exit signal Segmentation fault (11) [Mon Dec 06 22:48:51.598225 2021] [core:notice] [pid 3741] AH00052: child pid 4170 exit signal Segmentation fault (11) [Mon Dec 06 22:48:51.598262 2021] [core:notice] [pid 3741] AH00052: child pid 4212 exit signal Segmentation fault (11)
Even after hours of searching I couldn't find the reason for this behaviour, least of all the solution to it...
Has anyone ever seen this before? Can anyone maybe confirm this on his own host with Debian 11 and Apache 2.4.51?
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 _______________________________________________
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Hi Tomas
Are you using Plack there?
Yes, we are always using Plack.
Is it all the time? Some pages?
Yes it happens all the time - at least if someone uses the OPAC and/or the staff client. But until now it is not possible to find out what exact page triggers that message - sometimes I call a page and the message appears, sometimes not. Sometimes five or more of these messages appear at once. There are usually only a few seconds between one or more of these messages. And the logfile contains thousands of them. 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
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
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
participants (3)
-
Andreas Roussos -
Michael Kuhn -
Tomas Cohen Arazi