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

[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
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