linux-kernel - Re: [PATCHSET] blkcg: accumulated blkcg updates

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Message-ID: <20120306162455.GB32148@redhat.com>
Date:	Tue, 6 Mar 2012 11:24:55 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET] blkcg: accumulated blkcg updates

On Tue, Mar 06, 2012 at 10:07:09AM -0500, Vivek Goyal wrote:

[..]
> 
> My system is hanging during reboot. Last message I see is "Detaching DM
> devices" and nothing happens after that. I shall have to do some more 
> testing to figure out when did that start happening.

Ok, git bisect shows that very first patch to drain the queue is culprit.

9e5b9f8 block: blk-throttle should be drained regardless of q->elevator

Will do some more debugging.

Thanks
Vivek

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