Date: Tue, 30 Mar 2004 21:12:18 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: mapped pages being truncated [was Re: 2.6.5-rc2-aa5]
Message-ID: <20040330191218.GE3808@dualathlon.random>
References: <20040330190102.GD3808@dualathlon.random> <Pine.LNX.4.44.0403302002090.23584-100000@localhost.localdomain>
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On Tue, Mar 30, 2004 at 08:06:42PM +0100, Hugh Dickins wrote:
> On Tue, 30 Mar 2004, Andrea Arcangeli wrote:
> > On Tue, Mar 30, 2004 at 07:48:42PM +0100, Hugh Dickins wrote:
> > > 
> > > Do you have enough evidence that it's the very same bug?
> > 
> > yes, see the two stack traces, they trigger in the same place and it's
> > the very same workload. Andrew just noticed that xfs indeed calls
> > truncate_inode_pages before vmtruncate. It will trigger with your
> > patches too.
> 
> Yes, Andrew has got it (and I agree XFS is wrong to be doing that).

indeed.

> > Ok I see what you mean, this should fix it, agreed?
> 
> Yes, that's exactly the fix (for when COWing a reserved page).

thanks, great spotting!
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