Hi,

I think I found a bug in the auth module. It can be triggered when the userdb is in LDAP and an user is found multiple times in LDAP.

Dovecot version 2.2.10 (from ATrpms Testing) running on CentOS 6.5 x64.

Jun 27 10:34:34 server dovecot: auth: Debug: ldap(USER): user search: base=dc=linguamatics,dc=com scope=subtree filter=( & (uid=user) (| (&(objectClass=posixAccount)(|(employeeType=staff)(employeeType=guest))) (objectClass=account) ) ) fields=uid Jun 27 10:34:34 server kernel: auth[15916]: segfault at 8 ip 00007f45e5aa9bef sp 00007fff5b17e210 error 4 in libauthdb_ldap.so[7f45e5aa4000+a000] Jun 27 10:34:34 server dovecot: auth: Error: ldap(user): LDAP search returned multiple entries Jun 27 10:34:34 server dovecot: auth: Debug: ldap(user): no fields returned by the server Jun 27 10:34:35 server abrtd: Directory 'ccpp-2014-06-27-10:34:34-15916' creation detected Jun 27 10:34:35 server abrt[16137]: Saved core dump of pid 15916 (/usr/libexec/dovecot/auth) to /var/spool/abrt/ccpp-2014-06-27-10:34:34-15916 (2863104 bytes) Jun 27 10:34:35 server dovecot: doveadm(user): Error: userdb lookup(user): Disconnected unexpectedly Jun 27 10:34:35 server dovecot: doveadm(user): Error: sync: User lookup failed: Internal error occurred. Refer to server log for more information. Jun 27 10:34:35 server dovecot: auth: Fatal: master: service(auth): child 15916 killed with signal 11 (core dumped)

If more information is needed just let me know. I have the core dump but I was not able to find the debuginfo package for the installed Dovecot packages to extract the trace.

Thanks, Laszlo

-- Laszlo Toth Systems administrator Linguamatics 324 Cambridge Science Park Milton Road Cambridge CB4 0WG UK Telephone number: +44 (0)1223 651910 www.linguamatics.com