linux-kernel - Re: xfs: possible deadlock warning

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Message-ID: <20140528060050.GK8554@dastard>
Date:	Wed, 28 May 2014 16:00:50 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	xfs@....sgi.com, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: xfs: possible deadlock warning

On Wed, May 28, 2014 at 01:19:16PM +0800, Gu Zheng wrote:
> Hi all,
> When running the latest Linus' tree, the following possible deadlock warning occurs.

false positive. There isn't a deadlock between inode locks on
different filesystems. i.e. there is no dependency between shmem
inodes and xfs inodes, nor on their security contexts.  Nor can you
take a page fault on a directory inode, which is the XFS inode lock
class it's complaining about.

Fundamentally, the problem here is shmem instantiating a new inode
with the mmap_sem held. That's just plain wrong...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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