kern/49175: removing large sparse file freeze the system

[manu%netbsd.org@localhost]

>Number:         49175
>Category:       kern
>Synopsis:       removing large sparse file freeze the system
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 05 15:35:00 +0000 2014
>Originator:     Emmanuel Dreyfus
>Release:        All using FFS/WAPBL
>Organization:
>Environment:
NetBSD netbsd0.cloud.gluster.org 6.1.4 NetBSD 6.1.4 (GFS) #3: Fri Sep  5 
06:26:34 CEST 2014  
root%netbsd0.cloud.gluster.org@localhost:/usr/src/sys/arch/i386/compile/GFS i386

>Description:
When removing a  large sparse file on FFS/WAPBL the machine will freeze for a 
long time.
>How-To-Repeat:
dd if=/dev/zero of=test bs=1 count=1 oseek=999999999999999
rm test
>Fix: