kern/46918: i386/6.0_BETA6 crash in pr_find_pagehead

[cheusov%tut.by@localhost]

>Number:         46918
>Category:       kern
>Synopsis:       i386/6.0_BETA6 crash in pr_find_pagehead
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 06 15:25:01 +0000 2012
>Originator:     Aleksey Cheusov
>Release:        NetBSD 6.0_BETA2
>Organization:
>Environment:
System: NetBSD cheusov.imb.invention.com 6.0_BETA2 NetBSD 6.0_BETA2 (GENERIC) 
#11: Sat Jun 16 17:12:51 FET 2012 
cheusov%work.imb.invention.com@localhost:/srv/obj-current/sys/arch/i386/compile/GENERIC
 i386
Architecture: i386
Machine: i386
>Description:
coredump is available.

#0  0xc05ba748 in maybe_dump (howto=260) at
/srv/src_netbsd6/sys/arch/i386/i386/machdep.c:878
#1  cpu_reboot (howto=260, bootstr=0x0) at
/srv/src_netbsd6/sys/arch/i386/i386/machdep.c:899
#2  0xc07a4eba in vpanic (fmt=0xc0b59358 "kernel %sassertion \"%s\"
failed: file \"%s\", line %d ", ap=0xdc135a88 "\t\225µÀ\350ؾÀ") at
/srv/src_netbsd6/sys/kern/subr_prf.c:308
#3  0xc093e3c3 in kern_assert (fmt=0xc0b59358 "kernel %sassertion
\"%s\" failed: file \"%s\", line %d ") at
/srv/src_netbsd6/sys/lib/libkern/kern_assert.c:50
#4  0xc07a183c in pr_find_pagehead (pp=0xc0cc29c0, v=<optimized out>)
at /srv/src_netbsd6/sys/kern/subr_pool.c:470
#5  pool_do_put (pq=0xdc135b00, v=<optimized out>, pp=0xc0cc29c0) at
/srv/src_netbsd6/sys/kern/subr_pool.c:1139
#6  pool_put (pp=0xc0cc29c0, v=0xce0ee000) at
/srv/src_netbsd6/sys/kern/subr_pool.c:1263
#7  0xc07a1f07 in pool_cache_destruct_object1 (object=0xce0ee000,
pc=0xc0cc29c0) at /srv/src_netbsd6/sys/kern/subr_pool.c:2187
#8  pool_cache_invalidate_groups (pc=0xc0cc29c0, pcg=<optimized out>)
at /srv/src_netbsd6/sys/kern/subr_pool.c:2222
#9  0xc07a2dff in pool_cache_invalidate (pc=0xc0cc29c0) at
/srv/src_netbsd6/sys/kern/subr_pool.c:2280
#10 0xc07a2fe0 in pool_reclaim (pp=0xc0cc29c0) at
/srv/src_netbsd6/sys/kern/subr_pool.c:1556
#11 0xc07a32b8 in pool_drain_end (pp=0xc0cc29c0, where=96506) at
/srv/src_netbsd6/sys/kern/subr_pool.c:1668
#12 0xc08a1839 in uvm_pageout (arg=0xc39a1aa0) at
/srv/src_netbsd6/sys/uvm/uvm_pdaemon.c:346
#13 0xc0100321 in ?? ()
>How-To-Repeat:
No idea. My system crashed after a couple of days of bulk builds.
>Fix: