[Dovecot] Fatal: listen(143) failed: Interrupted system call

[Sandro Tosi]

Hi Timo,
thanks for replying :)

Timo Sirainen wrote:
> On Tue, 2009-07-14 at 14:52 +0200, Sandro Tosi wrote:
>   
>> dovecot: 2009-07-14 04:05:04 Warning: SIGHUP received - reloading
>> configuration
>> dovecot: 2009-07-14 04:05:04 Error: Temporary failure in creating login
>> processes, slowing down for now
>>     
>
> Does it say elsewhere why this temporary failure happened?
>   
There is nothing relevant in the other logs in /var/log - is there a
logfile you're expecting to contain interesting messages (other than
/var/log/dovecot of course ;) )?
>> dovecot: 2009-07-14 04:05:04 Fatal: listen(143) failed: Interrupted
>> system call
>>
>> we can reproduce this error with this tight loop:
>>
>> while date ; do kill -HUP $(cat /var/run/dovecot/master.pid) ; sleep 15s
>> ; done
>>     
>
> Yeah. listen() can be made to fail by sending a signal at the same time
> it's running. But if a signal is sent only once every 15 seconds, that's
> a bit strange.. If you run
>   
ok, so that's a known behavior, but there are other situations apart
that "stress" busy loop that can result in a crash of dovecot?
> strace -tt -p `pidof dovecot`
>
> what does it say between the last two HUPs before failing?
Ok, so I was able to replicate the problem:

$ while date ; do kill -HUP $(cat /var/run/dovecot/master.pid) ; sleep
15s ; done
...
Wed Jul 15 09:04:55 CEST 2009
Wed Jul 15 09:05:10 CEST 2009
Wed Jul 15 09:05:25 CEST 2009
cat: /var/run/dovecot/master.pid: No such file or directory
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ...
or kill -l [sigspec]

so it's dead.

Attached the strace file from 09.04 to 09.05 , the time frame where the
issue happened.

If you want me to do something else, I'm happy to :)

Thanks,
Sandro
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