linux-kernel - Re: 2.6.28-rc8 big regression in VM

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Message-ID: <20081215094409.GA4422@ics.muni.cz>
Date:	Mon, 15 Dec 2008 10:44:09 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc8 big regression in VM

On Mon, Dec 15, 2008 at 09:16:45AM +0800, Wu Fengguang wrote:
> Lukas, could you apply the attached patch, recompile and do
> 
> modprobe filecache
> free; cp /proc/filecache /tmp/a;
> echo 3 > /proc/sys/vm/drop_caches
> free; cp /proc/filecache /tmp/b;
> 
> and send me the outputs a and b?

unfortunately, it causes an oops (0000 [#1] SMP) in d_path + 0x31/0x110, code
48 85 c0 74 2f <48> 8b 40 30 48
rax = 0x100000001

(it does not save the oops into any log, thus I only wrote down possibly most
important clues)

-- 
Lukáš Hejtmánek
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