[Dovecot] Segmentation fault in dovecot director lmtp service

[Thierry de Montaudry]

On 17 Aug 2011, at 13:42, Reinhard Vicinus wrote:

> Hi,
> 
> 
>    the lmtp service of our dovecot director installation quits with a
>    segmentation fault if a lot of mails are simultaneously delivered.
>    For example if the postfix mailqueue is filled (for whatever reason)
>    and postqueue -f is run the lmtp service quits with a segmentation
>    fault:
> 
> 
>    Program terminated with signal 11, Segmentation fault.
> 
>    #0  o_stream_cork (stream=0x0) at ostream.c:75
> 
>    75              if (unlikely(stream->closed))
> 
>    (gdb) backtrace
> 
>    #0  o_stream_cork (stream=0x0) at ostream.c:75
> 
>    #1  0x00007fa6e6af45d9 in lmtp_client_send_more (client=0x2435870)
>    at lmtp-client.c:596
> 
>    #2  0x0000000002434170 in ?? ()
> 
>    #3  0x00000000004070d9 in proxy_send_more (proxy=0x2435870) at
>    lmtp-proxy.c:390
> 
>    #4  lmtp_proxy_data_input (proxy=0x2435870) at lmtp-proxy.c:444
> 
>    #5  0x00007fa6e6af456f in lmtp_client_send_data (client=0x24347a0)
>    at lmtp-client.c:306
> 
>    #6  0x0000000002434f98 in ?? ()
> 
>    #7  0xffffffffe6af73c5 in ?? ()
> 
>    #8  0x0000000002434840 in ?? ()
> 
>    #9  0x0000000000000000 in ?? ()
> 
> 
>    I don't have any ideas why the stream is 0. The configuration of the
>    dovecot director installation is attached. Please let me know if i
>    shall provide any more information or test something.
> 
> 
>    Kind regards
> 
>    Reinhard
> <dovecot-director-conf.txt>


Hi,

You might need to limit the concurrent deliveries from postfix.
Check the maxproc parameter in your master.conf, which is 100 by default. You should reduce it to some lower value, I would say between 10 and 40 depending on your system. That would allow your queues to grow without putting too much stress on the deliveries, even when forcing it with postqueue -f.

Regards,

	Thierry