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Message: #07843

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Re: [EP-tech] Apache crashes with a segmentation fault

Hi Janusz,

In the past I have noted that running EPrints using Apache's MPM Event
module rather than Prefork can cause Apache segfault in some scenarios.
 An update of Debian could have led Apache to switch to MPM Event
rather than Prefork but you should still be able to use the latter, by

a2dismod mpm_event
a2enmod mpm_prefork

Then I would advise running:

apache2ctl configtest

This will check that the first two commands have not created any
issues.  Then run apache2ctl restart to restart Apache.  If this does
not help let me know with any additional log information that you think
might be useful.  Also, it would be useful to know the versions of
Debian you were upgrading from and to and the version of Apache you now
have installed.


David Newman

On Fri, 2019-05-17 at 11:51 +0200, Janusz S. Bień via Eprints-tech
> Hi!
> In its 10th year of being in use, our digital library (harvested in
> particular by Europeana) was hit by the problem causes by the
> automatic
> upgrade of Debian stable. It may be the very problem described at
>          https://eur03.safelinks.protection.outlook.com/?url=http%3A%
> 2F%2Fwiki.eprints.org%2Fw%2FTroubleshooting&amp;data=01%7C01%7Cdrn%40
> ecs.soton.ac.uk%7Cd218a58e024948397b2908d6daad65b9%7C4a5378f929f44d3e
> be89669d03ada9d8%7C0&amp;sdata=LWRoW2OjIxproH0e2QEoOIjuR6ljy0PFm8FsLh
> JiS2s%3D&amp;reserved=0
>          Possible cause: apache linked against "expat" library. If
> you
>          did not install apache from source then it is possible it
> was
>          linked against the "expat" library. The problem arrises that
> it
>          is also linked against mod_perl and when we use the
> XML::Parser
>          module, that is also linked against expat. 2 expat's in one
>          apache make it seg-fault.
> What is the best way to proceed?
> We will appreciate very much your help.
> Best regards
> Janusz