kern/37880: unionfs still broken

[christos%zoulas.com@localhost]

>Number:         37880
>Category:       kern
>Synopsis:       locking problem in unionfs
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 27 03:50:00 +0000 2008
>Originator:     Christos Zoulas
>Release:        NetBSD 4.99.50
>Organization:
        none, but trying.
>Environment:
System: NetBSD t61.localnet 4.99.50 NetBSD 4.99.50 (GENERIC) #0: Sat Jan 26 
20:01:43 EST 2008  
ljt%t61.localnet@localhost:/p/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: amd64
Machine: amd64
>Description:
        see http://www.zoulas.com//images/NetBSD/imgp0251.jpg
>How-To-Repeat:

        /sbin/mount -t union -o nodev,nosuid /u/foo/sysadm/NetBSD/p/src /p/src

        and then I run a build.sh release in /p/src.

>Fix: