linux-kernel - Re: [PATCH] mm: Downgrade mmap_sem before locking or populating on mmap

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Message-ID: <20121216174801.GD4939@ZenIV.linux.org.uk>
Date:	Sun, 16 Dec 2012 17:48:01 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michel Lespinasse <walken@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, J??rn Engel <joern@...fs.org>
Subject: Re: [PATCH] mm: Downgrade mmap_sem before locking or populating on
 mmap

On Sun, Dec 16, 2012 at 05:04:03PM +0000, Al Viro wrote:

> Moreover, I'm not quite convinced that huge_memory.c and ksm.c can't run
> into all kinds of interesting races with ongoing coredump.  Looking into
> it...

Specifically, is collapse_huge_page() safe in parallel with ->core_dump()?
It *can* run while we are in the middle of e.g. elf_core_dump().
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