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@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@87.77.208.77, Message count decreased Oct 10 16:10:41 b3:Uruguay dovecot: imap[21184]: user=yayo@87.77.208.77, Raw backtrace: imap [yayo@87.77.208.77 130.133.4.83] [0x80cf615] -> imap [yayo@87.77.208.77 130.133.4.83] [0x80cfe6e] -> imap yayo@87.77.208.77 130.133.4.83 [0x80cf78f] -> imap yayo@87.77.208.77 130.133.4.83 [0x8068e9a] -> imap [yayo@87.77.208.77 130.133.4.83] [0x805a9fa] -> imap [yayo@87.77.208.77 130.133.4.83] [0x805ad26] -> imap yayo@87.77.208.77 130.133.4.83 [0x805f6a0] -> imap yayo@87.77.208.77 130.133.4.83 [0x805f904] -> imap [yayo@87.77.208.77 130.133.4.83] [0x806053d] -> imap [yayo@87.77.208.77 130.133.4.83] [0x80d823b] -> imap yayo@87.77.208.77 130.133.4.83 [0x80d8295] -> imap yayo@87.77.208.77 130.133.4.83 [0x80d8f2a] -> imap yayo@87.77.208.77 130.133.4.83 [0x80d82d7] -> imap yayo@87.77.208.77 130.133.4.83 [0x806be4c] -> /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xc8) [0xb7dcaea8] -> imap [yayo@87.77.208.77 130. Oct 10 16:10:41 b3:Uruguay dovecot: imap[21184]: user=yayo@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@FU-Berlin.DE Zentraleinrichtung für Datenverarbeitung (ZEDAT) Telefon +49 30 838-54327 Fabeckstraße 32 Telefax +49 30 838454327 14195 Berlin