kern/45115: lock error panic when build.sh*3 and daily script is running

[nonakap%gmail.com@localhost]

>Number:         45115
>Category:       kern
>Synopsis:       lock error panic when build.sh*3 and daily script is running
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 04 08:25:00 +0000 2011
>Originator:     NONAKA Kimihiro
>Release:        5.99.54
>Organization:
>Environment:
NetBSD koharu.myhome.local 5.99.54 NetBSD 5.99.54 (TPX201) #1810: Sun Jul  3 
18:56:34 JST 2011  
root@koharu.myhome.local:/usr/obj.i386/sys/arch/i386/compile/TPX201 i386
>Description:
NetBSD/i386-current(20110702) panic when build.sh*3 and daily script is running.

-----
Reader / writer lock error: rw_vector_enter: locking against myself

lock address : 0x00000000cead7418
current cpu  :                  0
current lwp  : 0x00000000cc124800
owner/count  : 0x00000000cc124800 flags    : 0x0000000000000004

panic: lock error
fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c0202324 cs 8 eflags 246 cr2 bb53a000 ilevel 0
Stopped in pid 9491.1 (find) at netbsd:breakpoint+0x4:  popl    %ebp
db{0}> bt
breakpoint()
panic()
lockdebug_abort()
rw_abort()
rw_vector_enter() at netbsd:rw_vector_enter+0x315
genfs_lock() at netbsd:genfs_lock+0xa8
layer_bypass() at netbsd:layer_bypass+0xc3
VOP_LOCK() at netbsd:VOP_LOCK+0x62
vclean() at netbsd:vclean+0x97
getcleanvnode() at netbsd:getcleanvnode+0xd4
getnewvnode() at netbsd:getnewvnode+0x70
ffs_vget() at netbsd:ffs_vget+0x57
ufs_lookup() at netbsd:ufs_lookup+0x74a
VOP_LOOKUP() at netbsd:VOP_LOOKUP+0x8b
lookup_once() at netbsd:lookup_once+0x18e
namei_tryemulroot() at netbsd:namei_tryemulroot+0x17c
namei() at netbsd:namei+0x2a
do_sys_stat(): netbsd:do_sys_stat+0x52
sys___lstat50() at netbsd:sys___lstat50+0x2a
syscall() at netbsd:syscall+0xc4
db{0}>

-----
nonaka@koharu:[-]$ mount
/dev/wd0a on / type ffs (log, NFS exported, local)
tmpfs on /tmp type tmpfs (local)
kernfs on /kern type kernfs (local)
procfs on /proc type procfs (local)
procfs on /usr/pkg/emul/linux/proc type procfs (local)
ptyfs on /dev/pts type ptyfs (local)
/home/source/NetBSD/src on /usr/src type null (local)
/home/source/NetBSD/pkgsrc on /usr/pkgsrc type null (local)
/home/source/NetBSD/xsrc on /usr/xsrc type null (local)
nonaka@koharu:[-]$

>How-To-Repeat:

>Fix: