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Subject: Re: [BUG] khugepaged crashes on x86_32
From: Steven Rostedt <rostedt@goodmis.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Rik van Riel <riel@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
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Date: Thu, 20 Jan 2011 12:02:35 -0500
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On Thu, 2011-01-20 at 17:57 +0100, Andrea Arcangeli wrote:
> 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).

Thanks for the update :-)

I'll apply this patch and run it through the tests again.

-- Steve