2.2.25 dumps core with "Panic: file imap-client.c: line 837 (client_check_command_hangs): assertion failed: (client->io != NULL)"

[Piper Andreas]

Am 12.09.2016 um 08:16 schrieb Aki Tuomi:
> 
> 
> On 12.09.2016 09:02, Piper Andreas wrote:
>> Am 01.09.2016 um 14:17 schrieb Aki Tuomi:
>>>
>>> On 01.09.2016 14:20, Piper Andreas wrote:
>>>> Hello Timo,
>>>>
>>>> with the newly build CSW-package the crashes still occur, today already
>>>> twice within two hours. The log shows always the same:
>>>>
>>>> Sep  1 11:50:13 surz113 dovecot: [ID 583609 mail.crit] imap(user):
>>>> Panic: file imap-client.c: line 837 (client_check_command_hangs):
>>>> assertion failed: (client->io != NULL)
>>>> Sep  1 11:50:13 surz113 dovecot: [ID 583609 mail.error] imap(user):
>>>> Error: Raw backtrace: 0xffff80ffb633d88d -> 0xffff80ffb636ae82 ->
>>>> 0x41eba0 -> 0x41ecf3 -> 0xffff80ffb635d248 -> 0xffff80ffb6350d2f ->
>>>> 0xffff80ffb63519e0 -> 0xffff80ffb6350dce -> 0xffff80ffb6350f90 ->
>>>> 0xffff80ffb62e3ebb -> 0x42f169 -> 0x41292c
>>>> Sep  1 11:50:13 surz113 dovecot: [ID 583609 mail.crit] imap(user):
>>>> Fatal: master: service(imap): child 11227 killed with signal 6 (core not
>>>> dumped - set service imap { drop_priv_before_exec=yes })
>>>>
>>>> This happens with different users, the last one with a relatively small
>>>> mailbox of 600MB.
>>>>
>>>> doveconf -n is attached.
>>>>
>>>> Dovecot 2.2.25
>>>> OS: Solaris 11 (SunOS 5.11 11.3 i86pc i386 i86pc)
>>>> Virtualization: VMware
>>>> Filesystem: ZFS
>>>> active users: ~4000
>>>>
>>>> The system was transferred at beginning of last week from an old
>>>> SPARC-station with Solaris 10 running dovecot-2.2.15 to this virtualized
>>>> platform under VMware. The mailboxes (maildir-format) were transferred
>>>> without change by switching the storage-hardware to the new server. I
>>>> had to remove all dovecot.index*-files for errors of "CPU Architecture
>>>> changed", but after doing this all seemed to work ok except for these
>>>> occasional crashes.
>>>>
>>>> If you need more information, please let me know.
>>>>
>>>> Thanks for any help,
>>>> Andreas
>>>>
>>>>> Hi Jake,
>>>>>
>>>>> thanks for fixing this. I have installed now the newly built package on
>>>>> my production system and will report, if any more core dumps occur.
>>>>>
>>>>> Regards,
>>>>> Andreas
>>>>>
>>> Hi!
>>>
>>> Is it possible for you test out a small patch (attached) to see if it
>>> fixes this issue?
>>>
>>> Aki
>>>
>> Hello Aki,
>>
>> your patch missed a trailing '{', which was corrected by the
>> OpenCSW-maintainer, who implemented the patch into a test-version of
>> dovecot-2.2.25 for me.
>>
>> I started this version on my production system on Friday morning (09.
>> Sep, 07:30). After that the server crashed once on Sunday evening
>> (11.Sep, 20:40), but with a completely different error message:
>>
>> Sep 11 20:40:37 surz113 dovecot: [ID 583609 mail.crit] imap(user1):
>> Panic: file imap-fetch.c: line 555 (imap_fetch_more): assertion failed:
>> (ctx->client->output_cmd_lock == NULL || ctx->client->output_cmd_lock ==
>> cmd)
>> Sep 11 20:40:37 surz113 dovecot: [ID 583609 mail.error] imap(user1):
>> Error: Raw backtrace: 0xffff80ffb5fcd88d -> 0xffff80ffb5ffae82 ->
>> 0x4225c1 -> 0x4153e5 -> 0x41ffae -> 0x41e4bf -> 0x41e865 -> 0x41ede4 ->
>> 0xffff80ffb5fe0d2f -> 0xffff80ffb5fe19e0 -> 0xffff80ffb5fe0dce ->
>> 0xffff80ffb5fe0f90 -> 0xffff80ffb5f73ebb -> 0x42f169 -> 0x41292c
>> Sep 11 20:40:37 surz113 dovecot: [ID 583609 mail.crit] imap(user1):
>> Fatal: master: service(imap): child 12150 killed with signal 6 (core not
>> dumped - set service imap { drop_priv_before_exec=yes })
>>
>> May this be related to your patch, or is it something completely different?
>>
>> Thanks and best regards,
>> Andreas
> Hi!
> 
> Apologies, I forgot to send you an email about this, it should be fixed with
> https://github.com/dovecot/core/commit/cd9cf45dcf9fcabc89e156117c4dcf464ec4eb85
> 
> Aki
> 

Hello and thanks for this information,

the OpenCSW-maintainer has implemented this fix into another test
version, which is now running on my production system. I'll report, if
there are any more problems.

Best regards,
Andreas


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