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Message-ID: <alpine.LFD.0.999.0710040920400.23684@woody.linux-foundation.org>
Date: Thu, 4 Oct 2007 09:38:28 -0700 (PDT)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Hugh Dickins <hugh@...itas.com>
cc: gurudas pai <gurudas.pai@...cle.com>,
Nick Piggin <nickpiggin@...oo.com.au>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Subject: Re: [BUG] kernel BUG at arch/i386/mm/highmem.c:15! on
2.6.23-rc8/rc9
On Thu, 4 Oct 2007, Hugh Dickins wrote:
>
> Very helpful, thanks. Guru, please try the appended patch, I think
> you'll find it fixes it for you (it did for me, once I'd puzzled out
> why I was failing to reproduce the problem - tests on ext3 don't work).
> Thank you so much for reporting this just in time!
Ouch.
The patch looks obviously correct, to the point that I don't understand
how this bug happened in the first place. It seems to have been
introduced by Nick in d0217ac04ca6591841e5665f518e38064f4e65bd ("mm: fault
feedback #1") if I read it right.
So "do_nonlinear_fault()" would effectively end up unmapping the PTE
twice, right? And if I understand the problem right, this wasn't noticed
immediately, because it probably only matters on:
- CONFIG_HIGHPTE
*and*
- a filesystem that allows VM_NONLINEAR, which became very rare with
dirty accounting.
Correct?
Linus
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