lmtpd gets stuck when started under load

[Sebastian Hagedorn]

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. +49-221-478-5587
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