what is vrlock, and why is it causing me problems?

[Marc G. Fournier]

/proc/10/status:syncer 10 0 0 0 -1,-1 noflags 1103511247,149 0,0 44097,435728 vrlock 0 0 0,0 -
/proc/39506/status:postgres 39506 39505 39500 39500 -1,-1 noflags 1106713055,403942 3002,40214 4118,737982 vrlock 1001 1001 1001,1001,1001 maildb.hub.org
/proc/51927/status:postgres 51927 41068 41068 41068 -1,-1 noflags 1107288042,547570 0,0 1,303423 vrlock 1001 1001 1001,1001,1001 pgsql72.hub.org
/proc/52582/status:postgres 52582 52581 52579 52579 -1,-1 noflags 1104953811,860872 16534,324197 22783,184956 vrlock 1001 1001 1001,1001,1001 pgsql74.hub.org
/proc/53309/status:umount 53309 82960 53309 82960 5,2 ctty 1107288298,562659 0,0 0,546634 vrlock 0 0 0,0,0,2,3,4,5,20,31 -
/proc/54039/status:umount 54039 53941 54039 53941 5,4 ctty 1107288402,928683 0,0 0,526544 vrlock 0 0 0,0,0,2,3,4,5,20,31 -
/proc/9/status:bufdaemon 9 0 0 0 -1,-1 noflags 1103511247,130 0,0 432,924063 vrlock 0 0 0,0 -

I can't even ^C out of the umount command:

# umount /vm/domainhere/proc
^C^C^C^C^C

Load on the server is neglible, so it isn't like I'm dealing with 'server 
lag':

# uptime
  4:11PM  up 43 days, 17:09, 7 users, load averages: 3.06, 3.80, 5.69

This only affects my two machines using vinum for RAID5 ... my hardware 
RAID machines, I've never seen this happen on :(

I'm running an 'older' version of 4.x here, but not *really* old:

 	FreeBSD 4.10-STABLE #7: Thu Oct  7 20:17:02 ADT 2004

help?

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664