linux-kernel - Re: 2.6.20.3 - possible recursive locking detected

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Date:	Thu, 26 Apr 2007 09:33:45 +1000
From:	David Chinner <dgc@....com>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	linux-kernel@...r.kernel.org, xfs-masters@....sgi.com,
	xfs@....sgi.com, viro@...iv.linux.org.uk
Subject: Re: 2.6.20.3 - possible recursive locking detected - in XFS

On Wed, Apr 25, 2007 at 11:16:57AM +0200, Jesper Juhl wrote:
> 
> Hi,
> 
> For your information : 
> 
> Once in a while I see the message below after I've just created a new XFS filesystem, mount it and then start copying data to it.

.....

> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.20.3generic #1
> ---------------------------------------------
> xfs_fsr/6117 is trying to acquire lock:
>  (&(&ip->i_lock)->mr_lock){----}, at: [<f929422d>] xfs_ilock+0x7d/0xa0 [xfs]
> 
> but task is already holding lock:
>  (&(&ip->i_lock)->mr_lock){----}, at: [<f929422d>] xfs_ilock+0x7d/0xa0 [xfs]

Known false positive - XFS doesn't have the annotations needed for
this yet; we've got a patch that will probably make it's way into 6.5.22 that
should fix most of these issues.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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