linux-kernel - Re: [PATCH 03/16] mm: check rb_subtree

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Message-ID: <CANN689E4jXT-VA3j54h_MBgCCc9YK0o_E7PY326NnvdiHmAgFQ@mail.gmail.com>
Date:	Mon, 12 Nov 2012 03:55:16 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>, x86@...nel.org,
	William Irwin <wli@...omorphy.com>, linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 03/16] mm: check rb_subtree_gap correctness

On Fri, Nov 9, 2012 at 6:13 AM, Sasha Levin <levinsasha928@...il.com> wrote:
> While fuzzing with trinity inside a KVM tools (lkvm) guest, using today's -next
> kernel, I'm getting these:
>
> [  117.007714] free gap 7fba0dd1c000, correct 7fba0dcfb000
> [  117.019773] map_count 750 rb -1
> [  117.028362] ------------[ cut here ]------------
> [  117.029813] kernel BUG at mm/mmap.c:439!
>
> Note that they are very easy to reproduce.

Thanks for the report. I had trouble reproducing this on Friday, but
after Hugh came up with an easy test case I think I have it figured
out. I sent out a proposed fix as "[PATCH 0/3] fix missing
rb_subtree_gap updates on vma insert/erase". Let's follow up the
discussion there if necessary.

Cheers,

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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