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[108.223.40.66]) by smtp.gmail.com with ESMTPSA id 14-v6sm460952pft.93.2018.08.01.18.19.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Aug 2018 18:19:02 -0700 (PDT) Subject: Re: linux-next: Tree for Aug 1 To: Stephen Rothwell , James Bottomley Cc: Linux-Next Mailing List , Linux Kernel Mailing List , linux-scsi References: <20180801175852.36549130@canb.auug.org.au> <20180801224813.GA13074@roeck-us.net> <1533163965.3158.1.camel@HansenPartnership.com> <1533164454.3158.3.camel@HansenPartnership.com> <20180802100505.56e663cb@canb.auug.org.au> From: Guenter Roeck Message-ID: <83936bed-e783-191f-c308-8f8470a0dbf3@roeck-us.net> Date: Wed, 1 Aug 2018 18:19:00 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180802100505.56e663cb@canb.auug.org.au> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/01/2018 05:05 PM, Stephen Rothwell wrote: > Hi all, > > On Wed, 01 Aug 2018 16:00:54 -0700 James Bottomley wrote: >> >> So what seems to be happening to cause this is that there's a patch >> somewhere between the merge base of my scsi-next series and the next >> tree and the patch just before scsi-next was actually merged that >> actually causes a boot failure with blk-mq enabled. Could you try to >> find this patch? I think the way to do it is to try to bisect this >> range of linux-next using the command line >> >> scsi_mod.use_blk_mq=1 >> >> Which forces block mq to be the default and seeing where the first boot >> failure is (you don't need my scsi-next tree merged to do this because >> all the offending patch does is flip the default state of the above >> flag). > > So this means using v4.8-rc1 as the first good commit and 453f1d821165 > ("Merge remote-tracking branch 'cgroup/for-next'") as the first bad > (assuming that this latter fails to boot with "scsi_mod.use_blk_mq=1"). > Puzzled. Same results. 453f1d821165 works with both scsi_mod.use_blk_mq=0 and scsi_mod.use_blk_mq=1. next-20180801 works with scsi_mod.use_blk_mq=0 and fails with scsi_mod.use_blk_mq=1. Bisect still points to the same commit (which just changes the default) as culprit. I know that doesn't make sense. I'll need to think about it. Guenter