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From: Jesus Cea on 23 Jul 2010 14:16
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I have spend the last months trying to debug an sporadic milter hang.
Finally, a few days ago I found a (brittle) reproductible case.

After a couple of days I determined that the problem was in postfix, not
my milter filter. I was running postfix 2.6.5, and reading the change
list, there is a milter fix in 2.6.6, so I upgraded directly to 2.6.7.

My problem is still there.

Details:

1. Sending a *specific* message TO a SPECIFIC address fails with a
timeout (in the mail client). If I send the same message to other
addresses in the server, everything works. I can send other messages to
that address without any issue.

2. Diagnosing the issue, I see the milter operation over that specific
message doesn't complete, so the timeout in the client.

3. Debugging the milter filter with Solaris "truss" (similar to linux
"strace") and dtrace (amazing tool), I see my milter sends a "CONTINUE"
to postfix, and postfix... doesn't send anything more until the client
disconnect because the timeout. In that event, it send a milter ABORT,
as it should.

4. Modifying the milter sourcecode to print tons of information I see
that, with this particular message, I get an "ENVRCPT" milter
notification, my milter accepts it and... nothing else. No headers, no
EOH, no body, no EOB.

I have a 100% reproducible case under 2.6.7, but the problem goes away
if I send the email to any other address, so I don't know if it can be
useful to you. The text message is around 70KB long (an attachment).

How can I help you to diagnose & solve the error?.


- --
Jesus Cea Avion _/_/ _/_/_/ _/_/_/
jcea(a)jcea.es - http://www.jcea.es/ _/_/ _/_/ _/_/ _/_/ _/_/
jabber / xmpp:jcea(a)jabber.org _/_/ _/_/ _/_/_/_/_/
.. _/_/ _/_/ _/_/ _/_/ _/_/
"Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/
"My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/
"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
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From: Wietse Venema on 23 Jul 2010 14:29
>
> How can I help you to diagnose & solve the error?.

With POSTFIX "smtpd -v" and "cleanup -v" logging for:

- One message that demonstrates the problem.

- The EXACT SAME MESSAGE with one letter changed in the recipient
address, so that it does not demonstrate the problem.

Do not send verbose logging with more then one "-v".

Wietse

From: Jesus Cea on 23 Jul 2010 14:37
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On 23/07/10 20:29, Wietse Venema wrote:
> - The EXACT SAME MESSAGE with one letter changed in the recipient
> address, so that it does not demonstrate the problem.

Only one letter?. Then would be a non existant account. Is this test
useful to you?. I could create a valid email alias. Should I?

- --
Jesus Cea Avion _/_/ _/_/_/ _/_/_/
jcea(a)jcea.es - http://www.jcea.es/ _/_/ _/_/ _/_/ _/_/ _/_/
jabber / xmpp:jcea(a)jabber.org _/_/ _/_/ _/_/_/_/_/
.. _/_/ _/_/ _/_/ _/_/ _/_/
"Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/
"My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/
"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
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From: Wietse Venema on 23 Jul 2010 14:49
Jesus Cea:
> On 23/07/10 20:29, Wietse Venema wrote:
> > - The EXACT SAME MESSAGE with one letter changed in the recipient
> > address, so that it does not demonstrate the problem.
>
> Only one letter?. Then would be a non existant account. Is this test
> useful to you?. I could create a valid email alias. Should I?

You wrote that changing the address makes the problem go away,
so I suggest that you provide evidence of that.

If this requires adding a temporary alias, just do it.

The fewer changes between "good" and "failure", the less time
it will take to solve the puzzle.

Wietse

From: Jesus Cea on 23 Jul 2010 15:33
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The email filesize is around 300Kbytes. The mailing list rejects it.

Should I send it to your personal email?. Send a ZIP file?

- --
Jesus Cea Avion _/_/ _/_/_/ _/_/_/
jcea(a)jcea.es - http://www.jcea.es/ _/_/ _/_/ _/_/ _/_/ _/_/
jabber / xmpp:jcea(a)jabber.org _/_/ _/_/ _/_/_/_/_/
.. _/_/ _/_/ _/_/ _/_/ _/_/
"Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/
"My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/
"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
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