[Koha-devel] Bug (or something) repeatedly loading the same URL over and over.

[Barry Cannon]

This has just starting happening to one of our sites. While I can recreate
a server crash by holding down the enter key on certain pages I am not
certain this is the issue. When holding down the enter key and forcing a
crash I can see the apache logs showing multiple posts. The kernel log
shows the end result of a server crash and OOM starts picking off
processes, as expected.
However, when the event happens in the wild, so to speak, there isn't
anything unusual about the apache logs. The syslog show the details below
suggesting opac-main.pl is the culprit but I am struggling to find any form
that posts to opac-main.pl in order to cause multipl form submissions.

/var/log/syslog.1:Oct  1 11:49:26 srv1 kernel: opac-main.pl invoked
oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
/var/log/syslog.1:Oct  1 11:49:26 srv1 kernel: [<c10a3408>]
oom_kill_process+0x68/0x220
/var/log/syslog.1:Oct  1 11:49:26 srv1 kernel: Out of memory: Kill process
6774 (mysqld) score 42 or sacrifice child
/var/log/syslog.1:Oct  1 11:49:26 srv1 kernel: Killed process 6774 (mysqld)
total-vm:335720kB, anon-rss:183608kB, file-rss:0kB
/var/log/syslog.1:Oct  1 11:49:26 srv1 kernel: init: mysql main process
(6774) killed by KILL signal


Regards
Barry




On Sat, Sep 28, 2013 at 6:16 AM, Robin Sheat <robin at catalyst.net.nz> wrote:

> op 28-09-13 07:45, Galen Charlton schreef:
> > Adapting a JavaScript technique [1] to disable multiple form submission
> > prevented holding down on the enter key from spamming patron searches
> > for me.  Of course, that's not a bulletproof technique for various
> > reasons, but something like it should probably be part of Koha's toolkit.
>
> I'm not completely convinced that it's someone holding down enter on the
> search form. However, if it is, or if it's something that has that
> effect, blocking multiple submits seems like a good defensive approach
> anyway.
>
> Robin.
>
>
>
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