linux-kernel - Re: [BUG] khugepaged crashes on x86

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Message-ID: <20110120165734.GI21494@random.random>
Date:	Thu, 20 Jan 2011 17:57:34 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [BUG] khugepaged crashes on x86_32

Hi Steven,

On Thu, Jan 20, 2011 at 11:52:45AM -0500, Steven Rostedt wrote:
> On Thu, 2011-01-20 at 11:46 -0500, Steven Rostedt wrote:
> 
> > I hit this bug with both v2.6.38-rc1 and with
> > 
> > HEAD == 12fcdba1b7ae8b25696433f420b775aeb556d89b
> 
> Note, this is not fully reproducible at every boot. To test manually, I
> had to boot up a couple of times to trigger it. But it never took more
> than 5 boots to do so. I test by just booting up and shutting down, it
> may trigger with some use as well, but I did not try that.

There was a highpte mistake in khugepaged that only affected 32bit
with HIGHPTE enabled so it wasn't noticed yet. Fix pointed out by
Minchan is queued in -mm (Johannes's submit).
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