Thanks for your reply!
On 02/02/2018 02:26 AM, Sebastian Hagedorn wrote:
[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?
I think I've seen this once or maybe twice, I don't recall details. I
wasn't able to determine a cause. I haven't seen it in years.
Did you look at the out queue, and if so was there a .bak file there.
This would be the entry currently being processed.
I looked at the out queue, and there was no .bak file.
Also, the TCP connection to the MTA being ESTABLISHED says the
OutgoingRunner has called SMTPDirect.process() and it in turn is
somewhere in its delivery loop of sending SMTP transactions.
Are there any clues in the MTA logs?
I just found this in Mailman's smtp-failures log:
Feb 01 14:28:49 2018 (1674) Low level smtp error: [Errno 111] Connection
refused, msgid:
<b51ba08829f27146a07699f58b941234a2739...@ex10dag2.intern.xxx>
Feb 01 14:28:49 2018 (1674) delivery to x...@uni-koeln.de failed with code
-1: [Errno 111] Connection refused
I can't prove it, but this time stamp seems to coincide with the moment the
OutgoingRunner got stuck, based on the age of the queue files. The
receiving SMTP server was under heavy load at that moment, so it is
possible that it might have refused the connection.
The message was delivered successfully after I killed the stuck runner and
restarted the service. I wasn't able to find anything pertinent on the
receiving server.
If this should happen again, what should we look for? Would a gdb backtrace
be helpful?
--
Sebastian Hagedorn - Weyertal 121, Zimmer 2.02
Regionales Rechenzentrum (RRZK)
Universität zu Köln / Cologne University - Tel. +49-221-470-89578
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