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Date:      Mon, 19 Mar 2007 14:46:07 +0200
From:      Ian FREISLICH <ianf@clue.co.za>
To:        Julian Elischer <julian@elischer.org>, freebsd-current@freebsd.org, Robert Watson <rwatson@FreeBSD.org>
Subject:   Re: Experiencing hangs on SMP box with no console messages given for clues. Details inside. 
Message-ID:  <E1HTHFX-0005Zk-Q9@clue.co.za>
In-Reply-To: Message from Ian FREISLICH <ianf@clue.co.za>  of "Mon, 19 Mar 2007 13:33:48 %2B0200." <E1HTG7Y-0005RL-43@clue.co.za> 

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Ian FREISLICH wrote:
> Julian Elischer wrote:
> > Robert Watson wrote:
> > > 
> > > On Sun, 18 Mar 2007, Bjoern A. Zeeb wrote:
> > > 
> > >> On Sun, 11 Mar 2007, Tillman Hodgson wrote:
> > >>
> > >>> On Sat, Mar 10, 2007 at 10:40:33PM -0600, Tillman Hodgson wrote:
> > >>>> Shouldn't take more than a day or two to get the info requested in
> > >>>> 11.9.
> > >>>
> > >>> As it turns out, a few hours.
> > >>>
> > >>> After capturing the information below I ran `panic`. While booting, 
> > >>> the following lock messages came up -- I thought it might be related 
> > >>> so I'll post it here:
> > > 
> > > If using uid/gid firewall rules, make sure to read the pertinent man 
> > > pages regarding setting debug.mpsafenet=0 in loader.conf to avoid 
> > > deadlocks.  This is only a workaround for the issue, and when 
> > > debug.mpsafenet is removed, this workaround will no longer be 
> > > available.  The authors/maintainers of the various firewall packages 
> > > need to correct these problems or the lock order reversals (and 
> > > associated deadlocks) will persist.
> > 
> > I actually have some work on this in an experimental branch..
> > it removes the requirement for users of ipfw to hold a lock on it
> > by making the firewall table an array rather than a lined list and then
> > using a read-copy-replace write semantic with reference conts on the array.



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