Re: [Mimedefang] "cmd read returned"

[Joseph Brennan]

>From two weeks ago:

> The error message: cmd read returned 0, expecting 5
> 
> means that the Sendmail end of the milter state machine expected to read
> 5 characters from mimedefang, but got EOF instead.


Solved. Or at least, explained.

It finally happened again yesterday, and this time I noticed the following
lines in /var/log/messages:

Jun  1 15:58:20 sendprodmail01 rsyslogd-2177: imuxsock begins to drop
messages from pid 2032 due to rate-limiting

Jun  1 15:58:20 sendprodmail01 kernel: mimedefang.pl invoked oom-killer:
gfp_mask=0x200da, order=0, oom_adj=0, oom_score_adj=0


So we lost mimedefang.sock because the system killed mimedefang. I now
believe that "cmd read returned 0, expecting 5" was just sendmail getting
no response, which makes sense when the milter has disappeared.

Why was imuxsock so busy? SELinux defaults (which are new to me). Imagine
trying to record in audit.log every time a file is created and deleted in
/var/spool, on a busy mail server. Dear readers, I hope you come no closer
to it than your imagination.

--Joseph Brennan
Columbia University




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Re: [Mimedefang] "cmd read returned"

[Joseph Brennan]

Dianne Skoll  wrote:

> The error message: cmd read returned 0, expecting 5
> 
> means that the Sendmail end of the milter state machine expected to read
> 5 characters from mimedefang, but got EOF instead.
> 
> I would try fixing the SpamAssassin problem to see if that fixes
> everything. There's no point in trying to debug two problems at once.


We did fix the Spamassassin error. If we see the rest of this again then I
agree we would have a cleaner example of the problem to check.

--Joe Brennan


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Re: [Mimedefang] "cmd read returned"

[Dianne Skoll]

On Tue, 24 May 2016 15:12:59 +0100
Dave Osbourne  wrote:

> I'm not a great help, but I think that I've seen that if there is any 
> STDOUT in anything (either the PERL or anything it calls) ... any
> errors or debugging have to go to a file...

Yes, anything going to STDOUT will mess things up royally... but probably
by causing a complaint from the multiplexor and not the milter.

The error message: cmd read returned 0, expecting 5

means that the Sendmail end of the milter state machine expected to read
5 characters from mimedefang, but got EOF instead.

I would try fixing the SpamAssassin problem to see if that fixes everything.
There's no point in trying to debug two problems at once.

Regards,

Dianne.
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Re: [Mimedefang] "cmd read returned"

[Dave Osbourne]

On 2016-05-23 17:59, Joseph Brennan wrote:

  Is there any other cause we can look for?


I'm not a great help, but I think that I've seen that if there is any 
STDOUT in anything (either the PERL or anything it calls) ... any errors 
or debugging have to go to a file...


I'm going to wait to get "disciplined" for this, but I think I'm right...

D


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