Sounds like some apache/php/opcode cache interaction. I’d usually guess rrdtool, but since this is effecting the ui and not specifically graph generation, it’s more likely to be a php issue.

Never seen this issue specifically before though, what is it running on?

Adam.

From: observium [mailto:observium-bounces@observium.org] On Behalf Of Beulen, Klaus via observium
Sent: 09 April 2020 10:09
To: observium@observium.org
Cc: Beulen, Klaus <Klaus.Beulen@thyssenkrupp.com>
Subject: [Observium] Apache dies with Segmentation Fault

Hi,

we are currently using Observium CE 19.8.10000 as a test installation to monitor part of our switch/router infrastructure (currently about 290 devices, mostly Cisco). From time to time we have problems accessing the UI, the web browser just answers “Page does not work – observium did not send an answer – ERR_EMPTY_RESPONSE”. When I check the error.log in /var/logs/apache, I find lots of lines like

…

[Wed Apr 08 14:44:44.362412 2020] [core:notice] [pid 1367] AH00051: child pid 27005 exit signal Segmentation fault (11), possible coredump in /etc/apache2

[Wed Apr 08 14:44:44.362479 2020] [core:notice] [pid 1367] AH00051: child pid 1696 exit signal Segmentation fault (11), possible coredump in /etc/apache2

[Wed Apr 08 14:44:53.366005 2020] [core:notice] [pid 1367] AH00051: child pid 7903 exit signal Segmentation fault (11), possible coredump in /etc/apache2

…

Is this a known bug/error in this version, or did I eventually configure something wrong? All packages are up to date (“apt update; apt upgrade”).

Regards,

    Klaus.