kern/45447: panic in kern_sleepq.c

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>Number:         45447
>Category:       kern
>Synopsis:       panic in kern_sleepq.c
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 09 17:15:00 +0000 2011
>Originator:     Alan Barrett
>Release:        NetBSD 5.99.56
>Organization:
Not much
>Environment:
System: NetBSD 5.99.56 i386
built from sources checked out with -D "2011-10-08 21:00 UTC"

>Description:
I was testing a recent i386 build using anita, and got this error:

inherit: panic: kernel diagnostic assertion "lwp_locked(l, NULL)" failed:
file "src/sys/kern/kern_sleepq.c", line 198

>How-To-Repeat:
Attempt to test a recent build in anita.

rump/rumpkern/t_lwproc (403/466): 8 test cases
    inherit: panic: kernel diagnostic assertion "lwp_locked(l, NULL)" failed: 
file "src/sys/kern/kern_sleepq.c", line 198
cpu0: Begin traceback...
kern_assert(c0b72254,c0b72295,c0b8a09d,c0bc8350,c6,0,e8edc557,c51950b0,c4095c00,c51a51d0)
 at netbsd:kern_assert+0x23
sleepq_enqueue(c0cd8770,7e8f019c,c0c063c6,c0ca74ec,0,c51950b0,ffffffff,c0530d64,c4fc5400,c5215c58)
 at netbsd:sleepq_enqueue+0x11a
lwp_park(0,bb8012f0,4,c51950b0,c0699afc,67,c51a5000,c5215ce0,c51a5000,c5215d48) 
at netbsd:lwp_park+0xf8
sys____lwp_park50(c51a5000,c5215cf4,c5215d1c,308,19fc000,100,308,c07b5e58,19fc000,c0c42100)
 at netbsd:sys____lwp_park50+0x42
syscall(c5215d48,bbb500b3,baa000ab,bfbf001f,bba9001f,bb8020e4,baa00000,babffe14,bbac0178,bb8012e0)
 at netbsd:syscall+0xa1
cpu0: End traceback...

>Fix: