cyrusdb error / skiplist recovery errors with corrupted username.seen file.

[John Hennessy]

Hi, I'm looking for best practice advice for recovering from a corrupted 
username.seen file. All was well until the server lost power a couple 
times back-to-back with 2 or three clients where connected to the same 
mailbox. The problems reveals itself as an InBox that does not retain 
its memory of Read mail items. I'm seeing the following couple of lines 
repeated 5 times in my logs for each access of the InBox.

May 25 20:02:07 server1 imap[1780]: [ID 729713 local6.error] DBERROR: 
opening /var/imap/user/j/john.seen: cyrusdb error
May 25 20:02:07 server1 imap[1779]: [ID 369663 local6.error] DBERROR: 
skiplist recovery /var/imap/user/j/john.seen: ADD at 560C exists

Operating System: Solaris 10 (Zone)
Cyrus IMAP Version: cyrus-imapd-2.2.13
Cyrus SASL: cyrus-sasl-2.1.21
Mail Server: Sendmail 8.13.6+Sun/8.13.6 (using cyrusv2 for local delivery)
Mail Client:  Thunderbird version 1.0.2 (20050317) - Linux
Mail Client: SquirrelMail 1.4.6 Web Client

I've attempted a "reconstruct -r user.john" with no improvement. Moving 
the username.seen file to a different name effectively forcing the 
username.seen file to be recreated fixes the problem albeit without 
knowledge of what's been previously read.

For those using SquirrelMail the problem reveals itself there as an 
InBox that can not be reopened once you select another mail folder. This 
was fixed by the above action of moving the corrupted username.seen file 
to another name.

Any advice would be appreciated.

Thanks

John.