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kern/44200: Machine freeze after huge data transfer

>Number:         44200
>Category:       kern
>Synopsis:       Machine freeze after huge data transfer
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Dec 07 17:55:00 +0000 2010
>Originator:     Jiri Novotny
>Release:        5.1_RC4
Masaryk University
$ uname -a
NetBSD bumbrdlik5.1RC4 5.1_RC4 NetBSD 5.1_RC4 (9660_debug) #6: po pro  6 
15:38:01 CET 2010  
novotny%bumbrdlik5.1RC4@localhost:/usr/src/sys/arch/i386/compile/9660_debug i386

After huge data transfer on dk RAID mashine freeze. The bug follows  PR 
kern/44002. Screenshots are avaliable at In the kernel was installed 
patch to vfs_wapbl.c 
( and twa 
patches (twa.c, twareg.h, twavar.h).
dkctl ld1d addwedge dk0 0  19531141087 ffs
newfs -O2 -s -64m dk0
mount /dev/dk0 /mnt

bonnie++ -p5
bonnie++ -y -d /mnt -s 1g > out1 &
bonnie++ -y -d /mnt -s 1g > out2 &
bonnie++ -y -d /mnt -s 1g > out3 &
bonnie++ -y -d /mnt -s 1g > out4 &
bonnie++ -y -d /mnt -s 1g > out5 &

System freeze mostly at first run of bonnie++

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