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

[Piper Andreas]

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
> 
-------------- next part --------------
# 2.2.25 (7be1766): /etc/opt/csw/dovecot/dovecot.conf
# OS: SunOS 5.11 i86pc  
auth_cache_negative_ttl = 0
auth_cache_size = 10 M
auth_master_user_separator = *
auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_
auth_username_format = %u
auth_worker_max_count = 1024
base_dir = /var/run/dovecot/
default_vsz_limit = 2 G
first_valid_gid = 30000
first_valid_uid = 30000
mail_location = maildir:%h/.maildir
mail_plugins = " mail_log notify"
mail_privileged_group = mail
namespace {
  hidden = no
  inbox = yes
  list = yes
  location = maildir:%h/.maildir
  prefix = 
  separator = /
  subscriptions = yes
  type = private
}
namespace inbox {
  hidden = yes
  inbox = no
  list = no
  location = maildir:%h/.maildir
  prefix = mail/
  separator = /
  subscriptions = no
  type = private
}
passdb {
  args = /etc/dovecot.deny
  deny = yes
  driver = passwd-file
}
passdb {
  args = /etc/opt/csw/dovecot/private/passwd.masterusers
  driver = passwd-file
  master = yes
}
passdb {
  args = blocking=yes cache_key=%u%s *
  driver = pam
}
pop3_uidl_format = %08Xv%08Xu
postmaster_address = postmaster at staff.uni-marburg.de
protocols = imap pop3
service auth-worker {
  user = $default_internal_user
}
service auth {
  client_limit = 6000
}
service imap-login {
  process_min_avail = 64
  service_count = 0
}
service imap {
  process_limit = 6000
}
ssl_cert = </etc/opt/csw/ssl/certs/imap.staff.uni-marburg.de.pem
ssl_key = </etc/opt/csw/ssl/private/imap.staff.uni-marburg.de.key
userdb {
  driver = passwd
}
protocol imap {
  mail_max_userip_connections = 25
  ssl_cert = </etc/opt/csw/ssl/certs/imap.staff.uni-marburg.de.pem
  ssl_key = </etc/opt/csw/ssl/private/imap.staff.uni-marburg.de.key
}
protocol pop3 {
  ssl_cert = </etc/opt/csw/ssl/certs/pop.staff.uni-marburg.de.pem
  ssl_key = </etc/opt/csw/ssl/private/pop.staff.uni-marburg.de.key
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5176 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://dovecot.org/pipermail/dovecot/attachments/20160901/918cf409/attachment-0001.p7s>