DBERROR: critical database situation

[sigsegv]

Greetings, I'm having problems with cyrus-imapd-2.2.12 and db4-4.3.27nb1 on 64-bit UltraSparc running NetBSD

# uname -a
NetBSD u10 3.0_BETA NetBSD 3.0_BETA (GENERIC) #1: Tue Mar 29 22:14:52 UTC 2005  root at u10:/opt/obj.sparc64/sys/arch/sparc64/compile/GENERIC sparc64

As soon as postfix tries to deliver a message, cyrus enters a loop and starts filling up logs with the following error messages:

Apr 19 20:57:18 u10 master[9254]: about to exec /usr/pkg/cyrus/bin/lmtpd
Apr 19 20:57:18 u10 lmtpunix[9254]: DBERROR : db4
Apr 19 20:57:18 u10 lmtpunix[9254]: DBERROR: critical database situation
Apr 19 20:57:18 u10 master[19558]: process 9254 exited, status 75
Apr 19 20:57:18 u10 master[19558]: service lmtpunix pid 9254 in READY state: terminated
 abnormally
Apr 19 20:57:18 u10 master[7274]: about to exec /usr/pkg/cyrus/bin/lmtpd
Apr 19 20:57:18 u10 lmtpunix[7274]: DBERROR : db4
Apr 19 20:57:18 u10 lmtpunix[7274]: DBERROR: critical database situation
Apr 19 20:57:18 u10 master[19558]: process 7274 exited, status 75
Apr 19 20:57:18 u10 master[19558]: service lmtpunix pid 7274 in READY state: terminated
 abnormally
... and so on

The same configuration works fine on i386. I can't figure out if this is a bug in db4 or cyrus. Any ideas?
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