[Dovecot] Odd error message

[Steven F Siirila]

We are running Dovecot 1.0-rc27 and have run across what seems to be a
fatal error (SIGSEGV) in the past few days (4 times total in past 6 days).
It appears to have been 5 separate users, 5 separate remote IP addresses.
Two of these have this format:

Mar 26 15:13:10 myhostname dovecot: imap-login: Authenticate PLAIN failed: Don't send unrequested data: user=<rmtuser>, method=PLAIN, rip=10.9.9.9, lip=10.1.1.1, TLS

The other three have this format:

Mar 26 09:41:45 myhostname dovecot: imap-login: Authenticate PLAIN failed: Don't send unrequested data: method=PLAIN, rip=10.9.9.9, lip=10.1.1.1, TLS

Here's the first one a bit more expanded, showing the SIGSEGV (signal 11):

Mar 26 15:13:10 myhostname dovecot: auth(default): client in: AUTH	1	PLAIN	service=IMAP	secured	lip=10.1.1.1	rip=10.9.9.9
Mar 26 15:13:10 myhostname dovecot: auth(default): client out: CONT	1	
Mar 26 15:13:10 myhostname dovecot: auth(default): client in: CONT<hidden>
Mar 26 15:13:10 myhostname dovecot: auth(default): pam(rmtuser,10.9.9.9): lookup service=IMAP
Mar 26 15:13:10 myhostname dovecot: auth(default): client out: OK	1	user=rmtuser
Mar 26 15:13:10 myhostname dovecot: auth(default): master in: REQUEST	675645	3333	1
Mar 26 15:13:10 myhostname dovecot: auth(default): passwd(rmtuser,10.9.9.9): lookup
Mar 26 15:13:10 myhostname dovecot: auth(default): master out: USER	675645	rmtuser	system_user=rmtuser	uid=99999	gid=9999	home=/home/r/rmtuser
Mar 26 15:13:10 myhostname dovecot: imap-login: Authenticate PLAIN failed: Don't send unrequested data: user=<rmtuser>, method=PLAIN, rip=10.9.9.9, lip=10.1.1.1, TLS
Mar 26 15:13:10 myhostname dovecot: imap-login: Disconnected: user=<rmtuser>, method=PLAIN, rip=10.9.9.9, lip=10.1.1.1, TLS
Mar 26 15:13:10 myhostname dovecot:  child 3333 (login) killed with signal 11

What can I do to further diagnose this problem?

-- 

Steven F. Siirila			Office: Lind Hall, Room 130B
Internet Services			E-mail: sfs at umn.edu
Office of Information Technology	Voice: (612) 626-0244
University of Minnesota			Fax: (612) 626-7593