Hi,

we've been running Mailman for many years and have never had stability issues, but about a month ago we moved the server from RHEL 5 to RHEL 6 and to the current version (2.1.25), and since then it has already happened twice that one of our four OutgoingRunners got "stuck" and stopped handling mail. When that happens a simple restart of the service does not work. These processes remained:


mailman 1663 0.0 0.0 233860 2204 ? Ss Jan16 0:00 /usr/bin/python2.7 /usr/lib/mailman/bin/mailmanctl -s -q start mailman 1677 0.1 0.9 295064 73284 ? S Jan16 35:35 /usr/bin/python2.7 /usr/lib/mailman/bin/qrunner --runner=OutgoingRunner:3:4 -s

root@mailman3/usr/lib/mailman/bin]$ strace -p 1677
Process 1677 attached
recvfrom(10, ^CProcess 1677 detached

[root@mailman3/usr/lib/mailman/bin]$ lsof -p 1677
COMMAND    PID    USER   FD   TYPE   DEVICE SIZE/OFF   NODE NAME
python2.7 1677 mailman  cwd    DIR    253,0     4096 173998 /usr/lib/mailman
python2.7 1677 mailman  rtd    DIR    253,0     4096      2 /
...
python2.7 1677 mailman 10u IPv6 46441320 0t0 TCP mailman3.rrz.uni-koeln.de:55764->smtp-out.rrz.uni-koeln.de:smtp (ESTABLISHED)

In both instances the OutgoingRunner was stuck on an SMTP connection. I had to use "kill -9" to get rid of it.

Any ideas what might be causing that?

Cheers
Sebastian
--
   .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                .:.Regionales Rechenzentrum (RRZK).:.
  .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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