From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Snitzer <snitzer@redhat.com>
Subject: Re: 3.15-rc4: circular locking dependency triggered by
	dm-multipath
Date: Tue, 6 May 2014 09:22:11 -0400
Message-ID: <20140506132211.GA22945@redhat.com>
References: <5368ABE8.9050909@acm.org>
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To: Bart Van Assche <bvanassche@acm.org>
Cc: device-mapper development <dm-devel@redhat.com>
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On Tue, May 06 2014 at  5:31am -0400,
Bart Van Assche <bvanassche@acm.org> wrote:

> Hello,
> 
> Has anyone else perhaps already run into this ?

Not seen this, how easily is it reproduced?

These recent commits are clearly the issue:

e809917735e dm mpath: push back requests instead of queueing
3e9f1be1b40 dm mpath: remove process_queued_ios()

Need to take a closer look at the lockdep splat you provided.