dovecot - Oct 2010 - Command died with signal 11: "/usr/libexec/dovecot/dovecot-lda"

Hi..

after upating from 2.0.1 to 2.0.4 postfix often reports errors when
deliveing mails to dovecot:

"Undelivered Mail Returned to Sender" ->
Command died with signal 11: "/usr/libexec/dovecot/dovecot-lda"

anyone seens this before ?

On Mon, 2010-10-04 at 14:36 +0200, spamvoll at googlemail.com wrote:
> "Undelivered Mail Returned to Sender" ->
> Command died with signal 11: "/usr/libexec/dovecot/dovecot-lda"
Difficult to do anything about this without a gdb backtrace. Can you
reproduce it by manually running dovecot-lda? If not, getting a core
dump would be the next best way to get a backtrace.
http://dovecot.org/bugreport.html

Am 04.10.2010 16:41, schrieb Timo Sirainen:
> On Mon, 2010-10-04 at 14:36 +0200, spamvoll at googlemail.com wrote:
>
>> "Undelivered Mail Returned to Sender" ->
>> Command died with signal 11:
"/usr/libexec/dovecot/dovecot-lda"
>
> Difficult to do anything about this without a gdb backtrace. Can you
> reproduce it by manually running dovecot-lda? If not, getting a core
> dump would be the next best way to get a backtrace.
> http://dovecot.org/bugreport.html
>
>
Hi,

I become aware this error today too. I checked my log, first time it 
ocourrs was Sep. 28, should be with version 2.0.3.

Every time a core file is generated at ~account. (maildir)
Can I do something with that file?

After postfix is killed it starts again and delivers this message. I 
think the message was still queued by postfix. Additionally the sender 
gets a non delivery.

regards
-- 
Mit freundlichen Gruessen --- Burckhard Schmidt

On 10/04/2010 09:38 PM, Schmidt wrote:
> Am 04.10.2010 16:41, schrieb Timo Sirainen:
>> On Mon, 2010-10-04 at 14:36 +0200, spamvoll at googlemail.com wrote:
>>
>>> "Undelivered Mail Returned to Sender" ->
>>> Command died with signal 11:
"/usr/libexec/dovecot/dovecot-lda"
>>
>> Difficult to do anything about this without a gdb backtrace. Can you
>> reproduce it by manually running dovecot-lda? If not, getting a core
>> dump would be the next best way to get a backtrace.
>> http://dovecot.org/bugreport.html
>>
>>
>
> Hi,
>
> I become aware this error today too. I checked my log, first time it 
> ocourrs was Sep. 28, should be with version 2.0.3.
>
> Every time a core file is generated at ~account. (maildir)
> Can I do something with that file?
>
> After postfix is killed it starts again and delivers this message. I 
> think the message was still queued by postfix. Additionally the sender 
> gets a non delivery.
>
> regards
Please make a gdb backtrace as described here:

http://www.dovecot.org/bugreport.htm

Regards,

Stephan

On 10/4/2010 11:42 PM, spamvoll at googlemail.com wrote:
> ok i can reproduce it,
>
> it happens when a mail should be delivered to 2 mailadresses of the same
user
>
Could you elaborate a little? I don't quite understand what you mean.

Regards,

Stephan.

dovecot-lda is called via transport

master.cf:
dovecot unix    -       n       n       -       10      pipe
  flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/dovecot-lda -f
${sender} -d ${recipient}

im currently trying to get a core dump postfix.. but no luck so far

2010/10/5 Stephan Bosch <stephan at rename-it.nl>:
> ?On 10/4/2010 11:56 PM, spamvoll at googlemail.com wrote:
>>
>> my userdb is LDAP
>>
>> each uid has multiple email adresses like lastname@ and
>> firstname.lastname@
>>
>> if you send a mail to lastname@ and firstname.lastname@ that happens
>
> Hmm, so then it is triggered at the MTA level. Perhaps it has something to
> do with the new -r argument to dovecot-lda (and similar changes in LMTP).
> How does your MTA offer mail to Dovecot ? How is dovecot-lda called?
>
> Can you produce a gdb backtrace?
>
> http://www.dovecot.org/bugreport.html
>
> Regards,
>
> Stephan.
>
>
>
>
>
>

Stephan Bosch <stephan <at> rename-it.nl> writes:
> 
> On 10/04/2010 09:38 PM, Schmidt wrote:
> > Am 04.10.2010 16:41, schrieb Timo Sirainen:
> >> On Mon, 2010-10-04 at 14:36 +0200, spamvoll <at>
googlemail.com wrote:
> >>
> >>> "Undelivered Mail Returned to Sender" ->
> >>> Command died with signal 11:
"/usr/libexec/dovecot/dovecot-lda"
> >>
> >> Difficult to do anything about this without a gdb backtrace. Can
you
> >> reproduce it by manually running dovecot-lda? If not, getting a
core
> >> dump would be the next best way to get a backtrace.
> >> http://dovecot.org/bugreport.html
> >>
> >>
> >
> > Hi,
> >
> > I become aware this error today too. I checked my log, first time it 
> > ocourrs was Sep. 28, should be with version 2.0.3.
> >
> > Every time a core file is generated at ~account. (maildir)
> > Can I do something with that file?
> >
> > After postfix is killed it starts again and delivers this message. I 
> > think the message was still queued by postfix. Additionally the sender
> > gets a non delivery.
> >
> > regards
> 
> Please make a gdb backtrace as described here:
> 
> http://www.dovecot.org/bugreport.htm
> 
> Regards,
> 
> Stephan
> 
> 

This has happened to me too. After a bit of investigation I believe I found what
causes it, and I have successfully managed to reproduce it.

This seems to happen when dovecot-lda attempts to deliver a mail to multiple
aliases resolving to the same user. For example:

# /etc/aliases
xiiph:  xiiph at example.com
admin:  xiiph at example.com

Sending a mail to both xiiph and admin (for example as to and cc) will result in
one mail being delivered, and one mail bounced with signal 11 from dovecot-lda.

The server behaves as I would want it to, only deliver one mail and not two to
the same user, but I would wish for it to silently ignore the error and suppress
the warning mail, as it may confuse senders.


/X

On Tue, 2010-10-12 at 18:42 +0000, Xiiph wrote:
> This has happened to me too. After a bit of investigation I believe I found
what
> causes it, and I have successfully managed to reproduce it.
> 
> This seems to happen when dovecot-lda attempts to deliver a mail to
multiple
> aliases resolving to the same user. For example:
> 
> # /etc/aliases
> xiiph:  xiiph at example.com
> admin:  xiiph at example.com
> 
> Sending a mail to both xiiph and admin (for example as to and cc) will
result in
> one mail being delivered, and one mail bounced with signal 11 from
dovecot-lda.
I think that simply causes two dovecot-ldas to be executed at the same
time. And that probably causes a race condition that causes the crash.
Did you already try patched with
http://hg.dovecot.org/dovecot-2.0/raw-rev/e2f9baa436f2 ?

Timo Sirainen <tss <at> iki.fi> writes:
> 
> I think that simply causes two dovecot-ldas to be executed at the same
> time. And that probably causes a race condition that causes the crash.
> Did you already try patched with
> http://hg.dovecot.org/dovecot-2.0/raw-rev/e2f9baa436f2 ?
> 
> 
I updated the server to 2.0.6 today, which I noticed already contained the above
mentioned patch. Unfortunatenly, it did not solve the problem :(

Is there any workaround I could apply in the mean time, in order to prevent a
bounce?

Best regards

/X