swap_pager: I/O error - pageout failed

I just saw a bunch of these:
 
swap_pager: I/O error - pageout failed; blkno 3136,size 36864, error 12
swap_pager: I/O error - pageout failed; blkno 3145,size 65536, error 12
swap_pager: I/O error - pageout failed; blkno 2879,size 4096, error 12

on a machine running this:

FreeBSD dirk.no.domain 5.3-BETA1 FreeBSD 5.3-BETA1 #1: Tue Aug 24
03:18:01 EST 2004     root_at_dirk.no.domain:/usr/obj/usr/src/sys/GENERIC 
i386

I think it might be ENOMEM from a geom when trying to g_clone_bio. The
machine appears fine now, i'm writing this message on it. Is it bad?

-Sam