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Subject: Re: NTFS deadlock on 2.6.18.6
From: Anton Altaparmakov <aia21@cam.ac.uk>
To: Sergey Vlasov <vsu@altlinux.ru>
Cc: linux-ntfs-dev@lists.sourceforge.net, linux-kernel@vger.kernel.org
In-Reply-To: <20070109205249.GA3802@procyon.home>
References: <20070109205249.GA3802@procyon.home>
Content-Type: text/plain
Organization: Computing Service, University of Cambridge, UK
Date: Wed, 17 Jan 2007 09:04:34 +0000
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Hi,

On Tue, 2007-01-09 at 23:52 +0300, Sergey Vlasov wrote:
[snip excellent analysis]
> Seems that grabbing i_mutex in ntfs_put_inode() is not safe after all
> (and lockdep cannot see this deadlock possibility, because one of
> waits is __wait_on_freeing_inode - not a standard locking primitive).

Inded.  Thanks a lot for the report and detailed analysis!  Much
appreciated.

I have been meaning to do the needed changes anyway so the new OSX and
Linux drivers are more alike but had not gotten round to it yet...  Now
that I know it actually causes a deadlock I will bite the bullet and do
the changes now.

ps. Aplogies for delayed response but I was on holiday without
computers/internet access...

Best regards,

	Anton

-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/

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