linux-kernel - Re: [dm-devel] [4.7.0rc6] Page Allocation Failures with dm-crypt

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Message-ID: <fe0eb105b21013453bc3375e7026925b@mail.ud19.udmedia.de>
Date:	Mon, 11 Jul 2016 15:27:42 +0200
From:	Matthias Dahl <ml_linux-kernel@...ary-island.eu>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	linux-mm@...ck.org, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] [4.7.0rc6] Page Allocation Failures with dm-crypt

Hello Mike...

On 2016-07-11 15:18, Mike Snitzer wrote:

> Something must explain the execessive nature of your leak but
> it isn't a known issue.

Since I am currently setting up the new machine, all tests were
performed w/ various live cd images (Fedora Rawhide, Gentoo, ...)
and I saw the exact same behavior everywhere.

> Have you tried running with kmemleak enabled?

I would have to check if that is enabled on the live images but even if
it is, how would that work? The default interval is 10min. If I fire up
a dd, the memory is full within two seconds or so... and after that, the
OOM killer kicks in and all hell breaks loose unfortunately.

I don't think this is a particular unique issue on my side. You could,
if I am right, easily try a Fedora Rawhide image and reproduce it there
yourself. The only unique point here is my RAID10 which is a Intel Rapid
Storage s/w RAID. I have no clue if this could indeed cause such a "bug"
and how.

Thanks,
Matthias

-- 
Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu
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