From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: 3.15-rc4: circular locking dependency triggered by dm-multipath Date: Mon, 26 May 2014 16:54:43 +0200 Message-ID: <538355B3.9060100@acm.org> References: <5368ABE8.9050909@acm.org> <536B1CC1.6080709@suse.de> <53832919.8080500@acm.org> <53832F2B.9060808@suse.de> <53833183.7080106@acm.org> <538333AC.60103@suse.de> <53833730.50509@suse.de> <538338D5.4080804@suse.de> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <538338D5.4080804@suse.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Hannes Reinecke Cc: dm-devel@redhat.com List-Id: dm-devel.ids On 05/26/14 14:51, Hannes Reinecke wrote: > Or, better still, try the attached patch. > There's one more instance where lockdep might complain. Does anyone know whether it's safe to revert commit 4cdd2ad780 ? Anyway, I ran a test with v3.15-rc7 + your patch + 4cdd2ad780 reverted and that test ran fine. I didn't encounter any lockups nor any lockdep complaints. The test I ran was to run a fio I/O verification test on top of a dm-multipath device. That multipath device was created on top of several SCSI device nodes created by the ib_srp driver. About once every 30 seconds a cable removal / reinsertion was simulated via the ibportstate command. Bart.