linux-ext4 - Re: [Bug 9483] circular locking dependency detected

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Message-ID: <20071204212518.GA10020@elte.hu>
Date:	Tue, 4 Dec 2007 22:25:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug 9483] circular locking dependency detected


* Aneesh Kumar K.V <aneesh.kumar@...ux.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?

	Ingo
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