From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: [v4.13-rc BUG] system lockup when running big buffered write(4M) to IB SRP via mpath Date: Wed, 23 Aug 2017 19:51:12 -0400 Message-ID: <20170823235112.GB23028@redhat.com> References: <20170808141715.GB22763@ming.t460p> <1502237504.4017.1.camel@redhat.com> <1502245693.6511.3.camel@redhat.com> <1502298599.2356.7.camel@wdc.com> <20170823113526.GA8130@ming.t460p> <1503501161.2484.3.camel@wdc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1503501161.2484.3.camel@wdc.com> Sender: linux-block-owner@vger.kernel.org To: Bart Van Assche Cc: "ming.lei@redhat.com" , "linux-block@vger.kernel.org" , "dm-devel@redhat.com" , "loberman@redhat.com" , "linux-scsi@vger.kernel.org" List-Id: dm-devel.ids On Wed, Aug 23 2017 at 11:12am -0400, Bart Van Assche wrote: > On Wed, 2017-08-23 at 19:35 +0800, Ming Lei wrote: > > soft lockup still can be observed easily with patch d4acf3650c7c( > > block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time), > > but no hard lockup. > > Hello Ming, > > I never claimed that commit d4acf3650c7c was a full solution to avoid these > soft lockups. I assume these results mean that patch series "[PATCH 0/7] > Device mapper and dm-mpath fixes" was not applied to the kernel used in your > tests? A colleague of you has reported that that patch series is sufficient > to avoid these soft lockups. See also > https://www.redhat.com/archives/dm-devel/2017-August/msg00122.html. FYI, I'll try to review/stage that patchset for 4.14 over the next few days. (I'm not yet back to working full-time but will try to handle my upstream responsibilities) Mike