From: Arjan van de Ven <arjan@linux.intel.com>
To: Alasdair G Kergon <agk@redhat.com>
Cc: Peter Osterlund <petero2@telia.com>,
linux-kernel@vger.kernel.org, dm-devel@redhat.com,
Ingo Molnar <mingo@elte.hu>, Milan Broz <mbroz@redhat.com>,
"Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
Subject: Re: lockdep warning when nesting dm devices
Date: Mon, 17 Jul 2006 11:16:28 +0200 [thread overview]
Message-ID: <1153127808.3062.0.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20060717024519.GA26318@agk.surrey.redhat.com>
On Mon, 2006-07-17 at 03:45 +0100, Alasdair G Kergon wrote:
> On Sat, Jul 15, 2006 at 01:17:29PM +0200, Peter Osterlund wrote:
> > # echo "0 10000 linear /dev/loop0 0" | /sbin/dmsetup create test
> > # echo "0 10000 linear /dev/mapper/test 0" | /sbin/dmsetup create test2
>
> > I get the following warning from the lockdep validator.
> > =============================================
> > [ INFO: possible recursive locking detected ]
> > ---------------------------------------------
>
> Well at first sight the message is simply pointing out something expected - it
> only say "INFO" after all - viz. recursive use of
> down_read(&md->io_lock);
is this indeed the same io_lock? Because if it is it's a serious
deadlock; rwsem's are NOT self-recursive!
prev parent reply other threads:[~2006-07-17 9:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-15 11:17 Peter Osterlund
2006-07-17 2:45 ` Alasdair G Kergon
2006-07-17 9:16 ` Arjan van de Ven [this message]
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