dovecot - Dec 2004 - (mail_index_sync_update_index): assertion failed

Anyone run into this one?  I'm using test53...

Dec  3 13:08:17 aurora dovecot: IMAP(doug): file mail-index-sync-update.c: line
1160 (mail_index_sync_update_index): assertion failed: (map->records_count ==
map->hdr.messages_count)
Dec  3 13:08:17 aurora dovecot: child 65942 (imap) killed with signal 6

It doesn't seem to correlate with any particular action.  The only change 
I make to the compilation is to comment out #define HAVE_FREEBSD_SENDFILE

Thanks,

Doug

Anyone have a hint as to how I might successfully debug this problem?

Dec  6 11:19:38 aurora dovecot: IMAP(doug): Corrupted index cache file
/home/doug/Maildir/dovecot.index.cache: record list is circular

Dec  6 11:20:02 aurora dovecot: IMAP(doug): msync() failed with index file
/home/doug/Maildir/dovecot.index: Invalid argument

(w/test56)

Thanks,

Doug