[Dovecot] imap crash "Message count decreased" (1.1.4)

[Heiko Schlichting]

During crash coredumpsize was set to 0, so there is no dump and no gdb
backtrace. Maybe the log entry is still helpful:

Oct 10 16:10:41 b6:Uruguay dovecot: imap[21184]: user=<yayo at 87.77.208.77>, Disconnected for inactivity in reading our output bytes=339/191358
Oct 10 16:10:41 b2:Uruguay dovecot: Panic: imap[21184]: user=<yayo at 87.77.208.77>, Message count decreased
Oct 10 16:10:41 b3:Uruguay dovecot: imap[21184]: user=<yayo at 87.77.208.77>, Raw backtrace: imap [yayo at 87.77.208.77 130.133.4.83] [0x80cf615] -> imap [yayo at 87.77.208.77 130.133.4.83] [0x80cfe6e] -> imap [yayo at 87.77.208.77 130.133.4.83](i_fatal+0) [0x80cf78f] -> imap [yayo at 87.77.208.77 130.133.4.83](imap_sync_deinit+0xec) [0x8068e9a] -> imap [yayo at 87.77.208.77 130.133.4.83] [0x805a9fa] -> imap [yayo at 87.77.208.77 130.133.4.83] [0x805ad26] -> imap [yayo at 87.77.208.77 130.133.4.83](client_command_cancel+0x83) [0x805f6a0] -> imap [yayo at 87.77.208.77 130.133.4.83](client_destroy+0xed) [0x805f904] -> imap [yayo at 87.77.208.77 130.133.4.83] [0x806053d] -> imap [yayo at 87.77.208.77 130.133.4.83] [0x80d823b] -> imap [yayo at 87.77.208.77 130.133.4.83](io_loop_handle_timeouts+0x19) [0x80d8295] -> imap [yayo at 87.77.208.77 130.133.4.83](io_loop_handler_run+0x94) [0x80d8f2a] -> imap [yayo at 87.77.208.77 130.133.4.83](io_loop_run+0x35) [0x80d82d7] -> imap [yayo at 87.77.208.77 130.133.4.83](main+0xbc) [0x806be4c] -> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xc8) [0xb7dcaea8] -> imap [yayo at 87.77.208.77 130.
Oct 10 16:10:41 b3:Uruguay dovecot: imap[21184]: user=<yayo at 87.77.208.77>, 133.4.83] [0x8058461]
Oct 10 16:10:41 b3:Uruguay dovecot: child 21184 (imap) killed with signal 6

Yes, the second last log line seems to be corrupted. This is not
a cut&paste error.

dovecot -n (exact version is dovecot-1-1-0329dc4df5ed)

# 1.1.4: /server/dovecot/server/etc/dovecot.conf
base_dir: /server/dovecot/server/var/run/
syslog_facility: local6
protocols: imap pop3
listen(default): 130.133.4.86:8143
listen(imap): 130.133.4.86:8143
listen(pop3): 130.133.4.86:8110
ssl_disable: yes
disable_plaintext_auth: no
shutdown_clients: no
nfs_check: no
login_dir: /server/dovecot/server/var/logindir
login_executable(default): /server/dovecot/server/libexec/dovecot/imap-login
login_executable(imap): /server/dovecot/server/libexec/dovecot/imap-login
login_executable(pop3): /server/dovecot/server/libexec/dovecot/pop3-login
login_greeting: mail.zedat.fu-berlin.de ready.
login_chroot: no
login_processes_count: 16
login_max_processes_count: 512
max_mail_processes: 1500
verbose_proctitle: yes
mail_uid: 865
mail_gid: 865
mail_location: maildir:/server/dovecot/spool/%2Ln/%Ln/maildir
maildir_copy_preserve_filename: yes
mail_executable(default): /server/dovecot/bin/wrapper imap
mail_executable(imap): /server/dovecot/bin/wrapper imap
mail_executable(pop3): /server/dovecot/bin/wrapper pop3
mail_plugins(default): acl quota imap_quota listescape
mail_plugins(imap): acl quota imap_quota listescape
mail_plugins(pop3): quota
mail_plugin_dir(default): /server/dovecot/server/lib/dovecot/imap
mail_plugin_dir(imap): /server/dovecot/server/lib/dovecot/imap
mail_plugin_dir(pop3): /server/dovecot/server/lib/dovecot/pop3
mail_log_prefix: %Ls[%p]: user=<%u>, 
mail_log_max_lines_per_sec: 50
imap_client_workarounds(default): delay-newmail netscape-eoh
imap_client_workarounds(imap): delay-newmail netscape-eoh
imap_client_workarounds(pop3): 
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): %u
pop3_client_workarounds(default): 
pop3_client_workarounds(imap): 
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
namespace:
  type: private
  separator: /
  inbox: yes
  list: yes
  subscriptions: yes
auth default:
  mechanisms: plain login
  user: dovecot
  username_format: %Lu
  failure_delay: 1
  passdb:
    driver: checkpassword
    args: /server/dovecot/bin/checkpassword-zedat
  userdb:
    driver: prefetch
plugin:
  quota: maildir
  quota_rule: *:bytes=5G
  acl: vfile:/server/dovecot/server/etc/acls

Heiko Schlichting          Freie Universität Berlin
heiko at FU-Berlin.DE         Zentraleinrichtung für Datenverarbeitung (ZEDAT)
Telefon +49 30 838-54327   Fabeckstraße 32
Telefax +49 30 838454327   14195 Berlin