linux-kernel - Re: kernel BUG at mm/truncate.c:475!

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Message-Id: <E1PSpQw-0005s5-QW@pomaz-ex.szeredi.hu>
Date:	Wed, 15 Dec 2010 12:22:10 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Hugh Dickins <hughd@...gle.com>
CC:	miklos@...redi.hu, akpm@...ux-foundation.org, robert@...ecki.net,
	lkml20101129@...ton.leun.net, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: kernel BUG at mm/truncate.c:475!

On Tue, 14 Dec 2010, Hugh Dickins wrote:
> I'd feel rather happier about it if I thought it would also fix
> Robert's kernel BUG at /build/buildd/linux-2.6.35/mm/filemap.c:128!
> but I've still not found time to explain that one.

Me neither, all unmap_mapping_range() calls from shmfs are either with
i_mutex or from evict_inode.

Hmm, is there anything preventing remap_file_pages() installing a pte
at an address that unmap_mapping_range() has already processed?

Thanks,
Miklos
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