lately get DBERROR db4: PANIC

[Björn Fahller]

Hello list,

Lately I get the below error situations almost daily. I cannot see any 
particular action that causes them. They just do. Perhaps once per day. Once 
the error situation occurrs, I have to "kill -9" a number of stuck processes, 
run ctl_cyrusdb -r, and recovery. After that, I can restart cyrus-imapd, and 
it runs nicely until next time, which can be after a day or two, or only a 
few hours.

The installation is cyrus-imapd-2.2.13 on a 2.6.22.1 linux kernel.

The installation is rediculously small with only 5 users.

Neither ctl_cyrusdb nor recover, tells what errors it corrects.

What can cause the below, and what can I do to avoid it?
   _
/Bjorn

Sep 14 13:41:36 quetzalcoatlus master[23314]: about to 
exec /usr/lib/cyrus/imapd
Sep 14 13:41:36 quetzalcoatlus master[23315]: about to 
exec /usr/lib/cyrus/lmtpd
Sep 14 13:41:36 quetzalcoatlus imap[23314]: DBERROR db4: PANIC: fatal region 
error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus imap[23314]: DBERROR: critical database 
situation
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23315]: DBERROR db4: PANIC: fatal 
region error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23315]: DBERROR: critical database 
situation
Sep 14 13:41:36 quetzalcoatlus master[16517]: process 23314 exited, status 75
Sep 14 13:41:36 quetzalcoatlus master[16517]: service imap pid 23314 in READY 
state: terminated abnormally
Sep 14 13:41:36 quetzalcoatlus master[23316]: about to 
exec /usr/lib/cyrus/imapd
Sep 14 13:41:36 quetzalcoatlus master[16517]: process 23315 exited, status 75
Sep 14 13:41:36 quetzalcoatlus master[16517]: service lmtpunix pid 23315 in 
READY state: terminated abnormally
Sep 14 13:41:36 quetzalcoatlus master[23317]: about to 
exec /usr/lib/cyrus/lmtpd
Sep 14 13:41:36 quetzalcoatlus imap[23316]: DBERROR db4: PANIC: fatal region 
error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus imap[23316]: DBERROR: critical database 
situation
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23317]: DBERROR db4: PANIC: fatal 
region error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23317]: DBERROR: critical database 
situation
Sep 14 13:41:36 quetzalcoatlus master[16517]: process 23316 exited, status 75
Sep 14 13:41:36 quetzalcoatlus master[16517]: service imap pid 23316 in READY 
state: terminated abnormally
Sep 14 13:41:36 quetzalcoatlus master[16517]: process 23317 exited, status 75
Sep 14 13:41:36 quetzalcoatlus master[16517]: service lmtpunix pid 23317 in 
READY state: terminated abnormally
Sep 14 13:41:36 quetzalcoatlus master[23318]: about to 
exec /usr/lib/cyrus/imapd
Sep 14 13:41:36 quetzalcoatlus master[23319]: about to 
exec /usr/lib/cyrus/lmtpd
Sep 14 13:41:36 quetzalcoatlus imap[23318]: DBERROR db4: PANIC: fatal region 
error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus imap[23318]: DBERROR: critical database 
situation
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23319]: DBERROR db4: PANIC: fatal 
region error detected; run recovery
Sep 14 13:41:36 quetzalcoatlus lmtpunix[23319]: DBERROR: critical database 
situation