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 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
-- 
________________________________________________________________________
Dr. Andreas Piper, Hochschulrechenzentrum der Philipps-Univ. Marburg
          Hans-Meerwein-Straße, 35032 Marburg, Germany
Phone: +49 6421 28-23521  Fax: -26994  E-Mail: piper at HRZ.Uni-Marburg.DE

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