To: Nico Schottelius <nico-kernel20120920@schottelius.org>
Cc: David Rientjes <rientjes@google.com>,
	Arend van Spriel <arend@broadcom.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	Dave Kleikamp <shaggy@kernel.org>,
	jfs-discussion@lists.sourceforge.net
Subject: Re: Out of memory on 3.5 kernels
In-Reply-To: Your message of "Wed, 03 Oct 2012 23:23:11 +0200."
             <20121003212311.GA14018@schottelius.org>
From: Valdis.Kletnieks@vt.edu
References: <505B1FA0.6030100@broadcom.com> <20120921194931.GA732@schottelius.org> <alpine.DEB.2.00.1209241538310.6356@chino.kir.corp.google.com> <20120926060653.GD16575@schottelius.org> <20120926085708.GA7839@schottelius.org> <20120927055208.GA25252@schottelius.org>
            <20121003212311.GA14018@schottelius.org>
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Date: Fri, 05 Oct 2012 11:48:04 -0400
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On Wed, 03 Oct 2012 23:23:11 +0200, Nico Schottelius said:

> does anyone of you have a clue so far what may be causing the huge
> slab usage?
>
> I've just found an interesting detail: umounting and cryptsetup
> luksClosing frees up the used memory (not sure which one was freeing
> up)

For what it's worth, I'm seeing a similar problem in linux-next on my laptop -
trying to run a backup to an external hard drive that has a LUKS partition on
it will OOM. (For some reason having the external LUKS partition is much more
problematic than the LVM-on-LUKS on the internal drive)

I've started bisecting, and gotten this far:

% git bisect log
git bisect start
# bad: [1aa44772a621e8547dc4db41b47c747469fe0ea3] Add linux-next specific files for 20121001
git bisect bad 1aa44772a621e8547dc4db41b47c747469fe0ea3
# good: [fea7a08acb13524b47711625eebea40a0ede69a0] Linux 3.6-rc3
git bisect good fea7a08acb13524b47711625eebea40a0ede69a0
# good: [526c4d73327f56f83da8b8088fd0b3c7be38c7ae] Merge remote-tracking branch 'regulator/for-next'
git bisect good 526c4d73327f56f83da8b8088fd0b3c7be38c7ae
# good: [961d70d88557405c5b7302c7d87752566468f035] Merge remote-tracking branch 'tty/tty-next'
git bisect good 961d70d88557405c5b7302c7d87752566468f035

(That's as far as I've gotten that I trust, the next bisect hits a different problem where
connecting the hard drive and *starting* cryptLuks hangs the machine hard, so I'll
have to finish bisecting that problem first, then return to bisecting this one)

I admit not being sure why you see it on a 3.5 kernel, but I only see it on stuff
that's after 3.6-rc3.

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