linux-kernel - Re: JFS - real deadlock and lockdep warning (2.6.18-rc5-mm1)

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Message-ID: <20060907153951.GB13103@inferi.kami.home>
Date:	Thu, 7 Sep 2006 17:39:51 +0200
From:	Mattia Dongili <malattia@...ux.it>
To:	Dave Kleikamp <shaggy@...tin.ibm.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...l.org
Subject: Re: JFS - real deadlock and lockdep warning (2.6.18-rc5-mm1)

On Wed, Sep 06, 2006 at 05:00:28PM -0500, Dave Kleikamp wrote:
[...]
> > I suspect JFS is guilty, anyway my HD has these partitions:
> 
> I haven't got around to instrumenting jfs properly with
> mutex_lock_nested(), so I know jfs doesn't run clean with lockdep
> enabled.  What that means is that these warnings don't necessarily point
> to a real problem, and on the other hand, lockdep hasn't been run
> correctly against jfs to prove that the mutex usage is safe.
> 
> That said, I'm not aware of any known problems in jfs resulting in a
> deadlock.  Unfortunately, without being able to use sysrq, I don't have
> any real good ideas for you off the top of my head to further track down
> the problem.

yup... don't know if it could put some light but simply doing

$ mv ~/.firefox ~/.firefox.old
$ cp ~/.firefox.old ~/.firefox

in order to allocate different inodes (right?) I can run Firefox
with my favourite skin (the one that was causing the hang before).

> I'm pretty busy this week, but I'll try to get the lockdep stuff right
> in jfs as soon as possible.  Who knows?  Maybe it will find a real
> locking problem.

I'll try to keep the filesystem as is to be able to test any fix/test
you'll propose (Eclipse still hangs the computer). Fortunately I have
one more spare partition where I can move /home.

Thanks
-- 
mattia
:wq!
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