I just sup'ed my kernel and recompiled it today (4/27) and now I see this 
sort of stuff in my /var/log/messages:

Apr 27 11:21:55 henric-ppp /netbsd: wesc0: reselect interrupted, sc_nexus == NULL
Apr 27 11:22:14 henric-ppp last message repeated 137 times
Apr 27 11:22:42 henric-ppp last message repeated 25 times
Apr 27 11:22:53 henric-ppp su: henric to root on /dev/ttyp0
Apr 27 11:22:54 henric-ppp /netbsd: wesc0: reselect interrupted, sc_nexus == NULL
Apr 27 11:23:20 henric-ppp last message repeated 42 times
Apr 27 11:25:13 henric-ppp last message repeated 63 times
Apr 27 11:31:11 henric-ppp last message repeated 49 times 

I've seen this message before, but only once every few hours during heavy
disk activity.  My previous kernel was built on the 18th (sup'ed on the
17th or 18th) and did not have this problem (i.e., this message would 
appear only once in a while).

I have an a4000 with a warp engine and two (identical) HP SCSI-II drives. 
I have filesystems and swap partitions on both drives. 

Anyway, has anybody else seen this problem?  Any ideas as to how to fix
it?  My understanding was that this was only an informational message, but
I don't know how useful it is to get one of these "informational messages"
every four seconds (depending on disk activity). 

-------- Henric Jungheim  -------------------  henric@zoom.com --------