Re: lmtpd gets stuck when started under load

From: Patrick Boutilier (no email)
Date: Thu Nov 14 2002 - 11:38:54 EST


Try duplicate.db = skiplist

Solved all of my lmtpd hanging problems.

I see you are using RPMs so I guess you would have to compile from
source to make the change.

Sebastian Hagedorn wrote:
> Hi,
>
> while testing our server setup we've found a (to me) strange behavior of
> lmtpd. Here's the setup:
>
> name : Cyrus IMAPD
> version : v2.1.9-Invoca-RPM-2.1.9-10 2002/08/30 18:40:23
> vendor : Project Cyrus
> support-url: http://asg.web.cmu.edu/cyrus
> os : Linux
> os-version : 2.4.18-4SGI_XFS_1.1bigmem
> environment: Cyrus SASL 2.1.5
> Sleepycat Software: Berkeley DB 3.3.11: (July 12, 2001)
> OpenSSL 0.9.6b [engine] 9 Jul 2001
> CMU Sieve 2.2
> TCP Wrappers
> mmap = shared
> lock = fcntl
> nonblock = fcntl
> auth = unix
> idle = poll
> dirhash = full
> mboxlist.db = skiplist
> subs.db = flat
> seen.db = skiplist
> duplicate.db = db3-nosync
> tls.db = db3-nosync
> [root at lvr1 raddb]# rpm -q cyrus-sasl
> cyrus-sasl-2.1.7-2
>
> (This is the RedHat 8.0 RPM that I installed under RedHat 7.3)
>
> First off, I'm a bit surprised that 'version' only shows the version of
> SASL that IMAPD was compiled against, not the current version ... that's
> just cosmetic, I guess.
>
> Anyway, we are also running sendmail 8.12.6 with the cyrusv2 mailer. All
> seems to be fine if we launch cyrus-imapd first and sendmail second.
> However, if we stop cyrus-imapd for whatever reason without stopping
> sendmail first, we end up in a situation where the lmtpd gets stuck upon
> a restart of cyrus-imapd. To be precise, it doesn't accept connections
> from sendmail and if we strace it all we see is:
>
> accept(4,
>
> That's it. The workaround then is to stop both sendmail and cyrus-imapd
> and to wait for several minutes. After that, if we start the processes
> in the right order, everything is fine again.
>
> Is this behavior to be expected or is it a bug?
>
> Thanks, Sebastian Hagedorn
> --
> Sebastian Hagedorn M.A. - RZKR-R1 (Flachbau), Zi. 18, Robert-Koch-Str. 10
> Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
> Universität zu Köln / Cologne University - Tel. +49-221-478-55
> 87








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