lib/47804: sudo hangs with 100% CPU as does sshd and apache httpd

[htodd%twofifty.com@localhost]

>Number:         47804
>Category:       lib
>Synopsis:       some processes don't exit and spin at 100% CPU
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 08 04:20:00 +0000 2013
>Originator:     Hisashi T Fujinaka
>Release:        NetBSD 6.99.19
>Organization:
none
        
>Environment:
        
        
System: NetBSD mara.i8u.org 6.99.19 NetBSD 6.99.19 (MARA) #546: Tue May 7 
15:07:34 PDT 2013 
htodd%mara.i8u.org@localhost:/usr/obj/amd64/sys/arch/amd64/compile/MARA amd64
Architecture: x86_64
Machine: amd64
>Description:
amd64-current, run "sudo ls"
ktrace is available upon request
        
>How-To-Repeat:
just run sudo or sshd
        
>Fix:
yes please.
        

>Unformatted: