Cyrus 2.5.9 imapd children count grows and exceeds limit

[Konrad Mauz]

Am 12.09.2016 um 05:01 schrieb Andy Dorman via Info-cyrus:
> Hi everyone.  We have 14 Debian servers running the current Debian
> release of Cyrus imap 2.5.9.
>
> We upgraded from 2.4.18 to 2.5.9 on Aug 28, upgraded the cyrus.conf &
> imapd.conf to rename the deprecated options and switch from skiplist to
> twoskip for all our dbs. Our cyrus.conf and imapd.con (minus comments)
> is at the end of this email.
>
> We now have 4 of the 14 servers where the number of imapd processes
> slowly grows and usually within 12-14 hours reaches the imapd process
> limit (currently set to 100).  From what we can tell watching the
> process list, the old processes are never shut down after reaching their
> usage limit (which is the default).
>
> The difference between the 4 with the problem and the others have to be
> the mail clients.  Each server supports a different group of mail
> domains and users, so I suspect some of the users on the problem servers
> are using one or more mail clients that are not well behaved, but I have
> no indication of what they are doing wrong.
>
> While we had this problem intermittently with 2.4.18 (once or twice a
> month on a random server), it is much worse since the update to 2.5.9.
> We now have to restart imapd on all the problem servers almost twice a day.
>
> If it matters, we have tried both idled and polling and have not seen
> any difference.
>
> So has anyone else seen an issue like this?  Does anyone have any
> suggestions on how to debug?
>
> We have examined syslog and do not see any strange reports outside of
> the normal berkeley DBERROR messages we always see due to bdb compiled
> into the debian Cyrus release.


Hi Andy,

try to set

tcp_keepalive: 1

in imapd.conf.

Regards,

Konrad




-- 
Hochschule Konstanz - Rechenzentrum
Konrad Mauz kmauz at htwg-konstanz.de
Tel: +497531206-472, Fax: -153
http://www.htwg-konstanz.de/rz.html

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5443 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.andrew.cmu.edu/pipermail/info-cyrus/attachments/20160912/092f4b55/attachment.p7s>