Various errors from cyrus maintenance processes

[Boylan, Ross]

I recently installed Cyrus2.4.16-4+deb7u2  on a new Debian wheezy system.  After an extended period of difficulties authenticating I can now access it.  sasldb has 2 users, ross and cyrus.  The only mailbox I created was user.ross.
Now I see this in my logs (from after the authentication trouble was fixed):
Oct 28 04:01:00 wheezy4 cyrus/cyr_expire[26711]: DIGEST-MD5 common mech free
Oct 28 04:01:00 wheezy4 cyrus/tls_prune[26710]: DBERROR: opening /var/lib/cyrus/tls_sessions.db: cyrusdb error
Oct 28 04:01:00 wheezy4 cyrus/master[7760]: process 26710 exited, status 1
Oct 28 04:01:00 wheezy4 cyrus/cyr_expire[26711]: IOERROR: opening index user.ross: System I/O error
Oct 28 04:01:00 wheezy4 cyrus/cyr_expire[26711]: unable to open mailbox user.ross
Oct 28 04:01:00 wheezy4 cyrus/cyr_expire[26711]: Expunged 0 out of 0 messages from 0 mailboxes

Do these messages indicate any real problems?  If so, how can I diagnose or fix them?

There is (AFAIK) no mail in the mailbox; my MTA is not attempting deliveries and my effort to copy content with UW's mailutil failed during the earlier login problems.

Thanks.
Ross Boylan


imapd.conf:
configdirectory: /var/lib/cyrus
proc_path: /run/cyrus/proc
mboxname_lockpath: /run/cyrus/lock
defaultpartition: default
partition-default: /var/spool/cyrus/mail
partition-news: /var/spool/cyrus/news
newsspool: /var/spool/news
altnamespace: no
unixhierarchysep: no
lmtp_downcase_rcpt: yes
admins: cyrus
allowanonymouslogin: no
popminpoll: 1
autocreatequota: 0
umask: 077
sieveusehomedir: false
sievedir: /var/spool/sieve
hashimapspool: true
allowplaintext: yes
sasl_mech_list: PLAIN
sasl_pwcheck_method: auxprop
sasl_auxprop_plugin: sasldb
sasl_auto_transition: no
tls_ca_path: /etc/ssl/certs
tls_session_timeout: 1440
tls_cipher_list: TLSv1+HIGH:!aNULL:@STRENGTH
lmtpsocket: /var/run/cyrus/socket/lmtp
idlesocket: /var/run/cyrus/socket/idle
notifysocket: /var/run/cyrus/socket/notify
syslog_prefix: cyrus