linux-kernel - Re: NTFS deadlock on 2.6.18.6

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Message-Id: <1169024674.10503.12.camel@imp.csi.cam.ac.uk>
Date:	Wed, 17 Jan 2007 09:04:34 +0000
From:	Anton Altaparmakov <aia21@....ac.uk>
To:	Sergey Vlasov <vsu@...linux.ru>
Cc:	linux-ntfs-dev@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: NTFS deadlock on 2.6.18.6

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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