[Mailman-Users] Strange errors

[Dan Szkola]

Mark Sapiro wrote:

>Dan Szkola wrote:
>  
>
>>I am running a Solaris 10 box, with mailman-2.1.6rc4 and sendmail
>>version 8.13.3. Python version is 2.4.1.
>>
>>I run sendmail in the following ways:
>>
>>
>>A normal sendmail daemon listening on port 25:
>>
>>/usr/lib/sendmail -bd -q15m
>>
>>A persistent queue runner:
>>
>>/usr/lib/sendmail -qp1m -OPidFile=/var/run/sendmail-qrun.pid
>>
>>A sendmail with submit.cf config:
>>
>>/usr/lib/sendmail -Ac -q5m
>>
>>A sendmail for smtp-auth listening on port 587:
>>
>>/usr/lib/sendmail -bd -C/etc/mail/sendmail-auth.cf -q15m
>>
>>
>>Anyway, the problem we are having is this:
>>
>> After running for several days with no errors, we suddenly start
>> seeing this error:
>>
>>    
>>
>>>>>Mail Delivery Subsystem <MAILER-DAEMON at xxxxxxx.xxx.xxx.xxx>
>>>>>          
>>>>>
>>10/17/2005 9:18:52 AM >>>
>>The original message was received at Mon, 17 Oct 2005 09:18:21 -0500
>>(CDT)
>>    
>>
>>from xxxxxxxx.xxx.xxx.xxx [131.156.xxx.xxx]
>  
>
>>  ----- The following addresses had permanent fatal errors -----
>>"|/usr/local/mailman/mail/mailman post testlist"
>>   (reason: 1)
>>   (expanded from: <testlist at xxxxx.xxx.xxx>)
>>
>>  ----- Transcript of session follows -----
>>Traceback (most recent call last):
>> File "/usr/local/mailman/scripts/post", line 35, in ?
>>   from Mailman.Queue.sbcache import get_switchboard
>> File "/usr/local/mailman/Mailman/Queue/sbcache.py", line 19, in ?
>>   from Mailman.Queue.Switchboard import Switchboard
>> File "/usr/local/mailman/Mailman/Queue/Switchboard.py", line 47, in
>>?
>>   from Mailman.Logging.Syslog import syslog
>> File "/usr/local/mailman/Mailman/Logging/Syslog.py", line 22, in ?
>>   from Mailman.Logging.StampedLogger import StampedLogger
>> File "/usr/local/mailman/Mailman/Logging/StampedLogger.py", line 20,
>>in ?
>>   from Mailman.Logging.Logger import Logger
>> File "/usr/local/mailman/Mailman/Logging/Logger.py", line 25, in ?
>>   from Mailman.Logging.Utils import _logexc
>> File "/usr/local/mailman/Mailman/Logging/Utils.py", line 18, in ?
>>   import traceback
>>ImportError: No module named traceback
>>554 5.3.0 unknown mailer error 1
>>
>>Has anyone seen this? Should I file a bug on this or send it along
>>to the developers list?
>>
>>Restarting sendmail seems to get rid of the problem for a day or two.
>>All sendmail configs have the mailman alias file included and we run
>>newaliases to update it on every new list creation.
>>    
>>
>
>
>This is curious indeed for at least two reasons.
>
>It is not a sendmail alias problem, nor does it seem on the face to be
>a sendmail problem at all. The post is received by sendmail and piped
>to the wrapper with the appropriate arguments. The wrapper invokes the
>post script as it should.
>
>The post script then does some imports one of which is
>    from Mailman.Queue.sbcache import get_switchboard
>
>sbcache does
>    from Mailman.Queue.Switchboard import Switchboard
>
>and so on until Mailman.Logging.Utils does
>    import traceback
>
>which results in ImportError: No module named traceback
>
>Now this is really strange because traceback is a Python library module
>and this chain of imports leading to 'import traceback' occurs with
>every post, so why does it fail now and why does restarting sendmail
>fix it?
>
>What happens if you restart Mailman (bin/mailmanctl restart) without
>restarting sendmail? Does that fix it? Or do all the qrunners die with
>the same ImportError?
>  
>
I restarted only the mailman processes using bin/mailmanctl restart and 
post still
generate the error above. I will put the line below into the mm_cfg.py 
file and
restart sendmail and watch what happens.

>I have no reason other than superstition for the following suggestion,
>but try
>
>SMTP_MAX_SESSIONS_PER_CONNECTION = 1
>
>in mm_cfg.py and see if that helps. This will cause Mailman to close
>the SMTP connection to sendmail after each transaction. This might
>avoid the problem, but since I have no idea what the problem is, I
>have no idea if this will help.
>
>  
>

--
Dan Szkola
Sr Unix Systems Programmer
Northern Illinois University