[horde] Sessions consuming CPU

[lst_hoe02 at kwsoft.de]

Zitat von Simon Wilson <simon at simonandkate.net>:

>
>
> Simon Wilson
> M: 0400 12 11 16
>
> On 04/11/2011, at 5:51 PM, LALOT Dominique <dom.lalot at gmail.com> wrote:
>
>> 2011/11/4 Simon Wilson <simon at simonandkate.net>
>> Over the last few weeks I have noticed periods of time where the  
>> virtual server running Horde climbs to 100% CPU utilisation. This  
>> can last for hours.
>>
>> Last time was 6 days ago, but then it did it again at 00:41am this  
>> morning, so I jumped into some troubleshooting.
>>
>> Stop httpd and the CPU drops to 0. Start it again, and within a  
>> minute or two it hits 100% again, and stays there.
>>
>> So I emptied the logs, stopped httpd, and set to monitoring it.
>>
>> iPhones / iPads turned off, Imp logged out.
>> Started httpd.
>> httpd access_log for Horde remains empty, with ZERO incoming requests.
>> After about 15 seconds this time - httpd hits 100%. AT THE SAME  
>> TIME, this message hits the horde log:
>>
>> 2011-11-04T01:04:11+10:00 ERR: HORDE [imp] Server does not support  
>> TLS connections. [pid 22050 on line 340 of  
>> "/var/www/horde4/imp/lib/Imap.php"]
>>
>> This message hits /var/log/horde up to 25 times per second, during  
>> which CPU usage remains at 100%.
>>
>> Still no incoming requests for httpd in httpd/access_log, or errors  
>> in httpd/error_log.
>>
>> The exact second that Horde logs that error, CPU hits 100%. Stop  
>> httpd, restart it, reproduce it. Did this several times over an  
>> hour, producing the exact same result - still ZERO http requests  
>> made of horde, 100% CPU at the same point the error gets logged.
>>
>> So I logged in to Horde, and looked in "Sessions". About 30  
>> sessions sitting in there, dating back up to a week old, across  
>> iPhone, Ipad, Mozilla, IE.
>>
>> As soon as I deleted the session files from /var/lib/php/session  
>> (kicked me out of Horde as expected), CPU usage immediately  
>> dropped, and the IMAP TLS message stopped.
>>
>> It hasn't done it this morning since, and clearing the old sessions  
>> has stopped both the errors in the log and brought CPU usage down  
>> to about 3%.
>>
>> Is there any way I can stop this reoccurring (other than monitoring  
>> for 100% CPU load and triggering a session file delete!)
>>
>> Thanks
>> Simon.
>>
>> --
>> Simon Wilson
>> M: 0400 12 11 16
>>
>> --
>> Horde mailing list
>> Frequently Asked Questions: http://horde.org/faq/
>> To unsubscribe, mail: horde-unsubscribe at lists.horde.org
>>
>> There was a bug in imp 5.0.13. For some search, IE9 is looping and  
>> leads to 100% CPU. The new version 5.0.14 should be better. You  
>> don't tell your version..
>>
>>
>> --
>> Dominique LALOT
>> Ingénieur Systèmes et Réseaux
>> http://annuaire.univmed.fr/showuser.php?uid=lalot
>
> Thanks Dom.
>
> Fully current and updated as at yesterday evening so not that tho.

That might be your problem. Have a look at imp/config/backends.php,  
the first entry is ENABLED by default and uses TLS. I have not yet  
figured out for which updates it overides backends.php but it might be  
considered as a bug.

Regards

Andreas


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