db4 problems with cyrus 2.1.16

[Febo Aristots]

I have had a bad problem with a seemingly corrupted mailboxes.db with
cyrus-imap 2.1.16

the problem started with this log entries:
Oct 17 03:27:21 mail ctl_cyrusdb[9217]: DBERROR db4: DB_LOGC->get: log
record ch
ecksum mismatch
Oct 17 03:27:21 mail ctl_cyrusdb[9217]: DBERROR db4: DB_LOGC->get:
catastrophic
recovery may be required
Oct 17 03:27:21 mail ctl_cyrusdb[9217]: DBERROR db4: PANIC: DB_RUNRECOVERY:
Fata
l error, run database recovery

database recovery wouldn't work but recovering a mailboxes.db from a backup
and zeroing /var/imap/db lets cyrus restart properly
and lets my users reread their mailboxes. I am left with new errors in the
log while checkpointing the databases, ctl_cyrusdb is unable to flush page 0
with
mailboxes.db and other errors (see below). I have always used db4 4.1.25 for
a couple of years now.
What can I do to resolve the problem ?? using ctl_cyrusdb to reconstruct
manually the files brings me back to the original problem!!


Oct 17 17:46:29 mail ctl_cyrusdb[8112]: checkpointing cyrus databases
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: DB_ENV->log_flush: LSN
past
current end-of-log
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: /var/imap/mailboxes.db:
una
ble to flush page: 0
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: txn_checkpoint: failed
to f
lush the buffer cache Invalid argument
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR: couldn't checkpoint:
Invalid ar
gument
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR: sync /var/imap/db: cyrusdb
erro
r
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: DB_ENV->log_flush: LSN
past
current end-of-log
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: /var/imap/mailboxes.db:
una
ble to flush page: 0
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR db4: txn_checkpoint: failed
to f
lush the buffer cache Invalid argument
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR: couldn't checkpoint:
Invalid ar
gument
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: DBERROR: sync /var/imap/db: cyrusdb
erro
r
Oct 17 17:46:29 mail ctl_cyrusdb[8112]: done checkpointing cyrus databases
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