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Re: xfs: possible deadlock warning

To: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
Subject: Re: xfs: possible deadlock warning
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 28 May 2014 16:00:50 +1000
Cc: xfs@xxxxxxxxxxx, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <538571D4.70904@xxxxxxxxxxxxxx>
References: <538571D4.70904@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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...


Dave Chinner

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