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From: subbsd <subbsd@gmail.com>
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Subject: misc/162455: FreeBSD 9x unstable with file-based swap
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>Number:         162455
>Category:       misc
>Synopsis:       FreeBSD 9x unstable with file-based swap
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 11 00:10:11 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     subbsd
>Release:        9.0-RC2
>Organization:
>Environment:
>Description:
Some information is described here http://lists.freebsd.org/pipermail/freebsd-fs/2011-October/012878.html. 
However two of my hosts with swapfile="/usr/swap0" in /etc/rc.conf, where /usr/swap0 is created by dd (official handbook way), perfectly hang without swapoff, through N time of the beginning of use swap
>How-To-Repeat:
1) dd if=/dev/zero of=/usr/swap0 bs=1024k count=512
2) swapfile="/usr/swap0"  to /etc/rc.conf
3) service addswap start

start to use a swap, or play with swapoff/on command like this:
http://lists.freebsd.org/pipermail/freebsd-fs/2011-October/012878.html
>Fix:
Sorry

>Release-Note:
>Audit-Trail:
>Unformatted: