kern/37955: Kernel Panic NetBSD 4.0 blkfree

[vlvdberg%mijnpostvak.in@localhost]

>Number:         37955
>Category:       kern
>Synopsis:       Kernel Panic NetBSD 4.0 blkfree
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 04 16:45:02 +0000 2008
>Originator:     Vincent van den Berg
>Release:        4.0.0_PATCH
>Organization:
>Environment:
NetBSD chernobyl.ms63 4.0.0_PATCH NetBSD 4.0.0_PATCH (GENERIC) #0: Mon Feb  4 
16:30:51 CET 2008  
root%chernobyl.ms63@localhost:/usr/obj/sys/arch/i386/compile/GENERIC i386
>Description:
Feb  4 01:59:52 chernobyl /netbsd: dev = 0x40c, block = 22730448, fs = /backup
Feb  4 01:59:52 chernobyl /netbsd: panic: blkfree: freeing free frag

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The error occurs in 4.0.0_PATCH as well as in 4.0_STABLE while doing normal 
disk operations (rsnapshot or even rm -rf) Now switched to 4.0-RELEASE to test 
if this branch has the same issue...

>How-To-Repeat:
rsnapshot (rsync) to Western Digital Passport Drive 60GB

dmesg:

umass1 at uhub1 port 2 configuration 1 interface 0
umass1: Western Digital External HDD, rev 2.00/2.40, addr 3
umass1: using SCSI over Bulk-Only
scsibus1 at umass1: 2 targets, 1 lun per target
sd1 at scsibus1 target 0 lun 0: <WDC WD60, 0VE-00HDT0, 0000> disk fixed
sd1: 57231 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 117210240 sectors

>Fix: