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Sender: Mikolaj Golub <to.my.trociny@gmail.com>
Date: Sat, 4 May 2013 21:11:45 +0300
From: Mikolaj Golub <trociny@FreeBSD.org>
To: KIRIYAMA Kazuhiko <kiri@pis.elm.toba-cmt.ac.jp>
Subject: Re: Vimage Jail kernel crashed
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On Sat, May 04, 2013 at 10:41:46PM +0900, KIRIYAMA Kazuhiko wrote:

> > If you still prefer pf, you may try destroying epair interface before
> > destroying vnet, e.g. using prestop rc.d/jail hooks instead of
> > poststop, if it is possible.
> 
> In particular, execute following sequence?
> 
> # ifconfig epairXa destroy
> # ifconfig bridge0 deletem epairXa

Yes, but in the revers order, delete from the bridge first. It is
about lines like these in your configuration:

 export jail_web_exec_poststop0="ifconfig bridge0 deletem epair4a"
 export jail_web_exec_poststop1="ifconfig epair4a destroy"

The crash happened when executing ifconfig epair destroy. 

You might want to try running commands manually before using the rc
script.

-- 
Mikolaj Golub