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Date: Tue, 4 Dec 2007 22:39:57 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: aneesh.kumar@linux.vnet.ibm.com, linux-ext4@vger.kernel.org,
       linux-kernel@vger.kernel.org, bugme-daemon@bugzilla.kernel.org
Subject: Re: [Bug 9483] circular locking dependency detected
Message-ID: <20071204213957.GA12772@elte.hu>
References: <20071130073446.GA7864@skywalker> <20071204212518.GA10020@elte.hu> <20071204133515.83b26277.akpm@linux-foundation.org>
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* Andrew Morton <akpm@linux-foundation.org> wrote:

> On Tue, 4 Dec 2007 22:25:18 +0100
> Ingo Molnar <mingo@elte.hu> wrote:
> 
> > 
> > * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> wrote:
> > 
> > > =======================================================
> > > [ INFO: possible circular locking dependency detected ]
> > > 2.6.24-rc3 #6
> > > -------------------------------------------------------
> > > bash/2294 is trying to acquire lock:
> > > (&journal->j_list_lock){--..}, at: [<c01eee2f>] journal_try_to_free_buffers+0x76/0x10c
> > > 
> > > but task is already holding lock:
> > > (inode_lock){--..}, at: [<c01864b6>] drop_pagecache+0x48/0xd8
> > > 
> > > which lock already depends on the new lock.
> > 
> > Andrew, drop_pagecache() is root-only and it has some known deadlock, 
> > right?
> > 
> 
> yup.  It takes inode_lock at too high a level so it can walk the 
> per-sb inode lists.

Is there anyone genious enough to fix this? :-/

	Ingo
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