kern/38764: process rlimit seems confused

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>Number:         38764
>Category:       kern
>Synopsis:       process rlimit seems confused
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 27 07:50:00 +0000 2008
>Originator:     Andrew Doran
>Release:        4.99.63
>Organization:
The NetBSD Project
>Environment:
n/a
>Description:
Sometimes I see the following when I have su'ed to root from my user
account and created lots of processes in another session:

lazarus$ su 
Password:
su: /bin/ksh: Resource temporarily unavailable
lazarus$ ulimit -p 
160

On this particular occasion, build.sh was running in the background.
Checking ps, my user account and root appear to be well within limits.
When the number of root processes drops to within my limit, I can su.

>How-To-Repeat:
See above.
>Fix:
Unknown, presumably some confusion with (e)uid somewhere.