linux-kernel - Re: [Bug] Reproducible data corruption on i5-3340M: Please revert 53a59fc67!

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Message-ID: <20130815134031.GC27864@dhcp22.suse.cz>
Date:	Thu, 15 Aug 2013 15:40:31 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ben Tebulin <tebulin@...glemail.com>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [Bug] Reproducible data corruption on i5-3340M: Please revert
 53a59fc67!

On Thu 15-08-13 05:02:31, Linus Torvalds wrote:
> On Thu, Aug 15, 2013 at 2:25 AM, Ben Tebulin <tebulin@...glemail.com> wrote:
> >
> > I just cherry-picked e6c495a96ce0 into 3.9.11 and 3.7.10.
> > Unfortunately this does _not resolve_ my issue (too good to be true) :-(
> 
> Ho humm. I've found at least one other bug, but that one only affects
> hugepages. Do you perhaps have transparent hugepages enabled? But even
> then it looks quite unlikely.

__unmap_hugepage_range is hugetlb not THP if you had that one in mind.
And yes, it doesn't set the range which sounds buggy.

> I'll think about this some more. I'm not happy with how that
> particular whole TLB flushing hack was done, but I need to sleep on
> this.

I am looking into it as well, but there are high prio things which
preempt me a lot :/

Thanks for looking into it.
-- 
Michal Hocko
SUSE Labs
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