linux-kernel - 2.6.27-rc7: unsafe lock order/inconsistent lock state after removing multipath device

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Date:	Mon, 29 Sep 2008 18:55:41 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	dm-devel@...hat.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 2.6.27-rc7: unsafe lock order/inconsistent lock state after removing multipath device

I needed to quickly check some things on multipath; I only had available
notebook with USB stick so I arranged for single path multipath with
faked WWID (which worked by the way).

Testing what happans when last path is lost, I started IO from dm and
removed USB stick. It resulted in quite a long kernel warning about
unsafe lock order. I tested several times and once more got warning
about possible inconsistent lock state.

I attach 2 logs with kernel output (one of them includes dmesg from boot)
and kernel config. Please let me now if additional information is required.

-andrey

View attachment "multipath-1.log" of type "text/x-log" (168040 bytes)

View attachment "multipath-2.log" of type "text/x-log" (8873 bytes)

View attachment "config-2.6.27-rc7-1avb" of type "text/plain" (55124 bytes)

Download attachment "signature.asc " of type "application/pgp-signature" (198 bytes)