linux-kernel - Re: kernel BUG at drivers/scsi/scsi

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Message-ID: <1448026622.3974.28.camel@redhat.com>
Date:	Fri, 20 Nov 2015 08:37:02 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Christoph Hellwig <hch@...radead.org>
Cc:	"James E. J. Bottomley" <JBottomley@...n.com>,
	brking <brking@...ibm.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-block@...r.kernel.org
Subject: Re: kernel BUG at drivers/scsi/scsi_lib.c:1096!

On Fri, 2015-11-20 at 13:56 +0100, Laurent Dufour wrote:
> On 20/11/2015 13:10, Michael Ellerman wrote:
> > On Thu, 2015-11-19 at 00:23 -0800, Christoph Hellwig wrote:
> > 
> > > It's pretty much guaranteed a block layer bug, most likely in the
> > > merge bios to request infrastucture where we don't obey the merging
> > > limits properly.
> > > 
> > > Does either of you have a known good and first known bad kernel?
> > 
> > Not me, I've only hit it one or two times. All I can say is I have hit it in
> > 4.4-rc1.
> > 
> > Laurent, can you narrow it down at all?
> 
> I'm trying bisect it but it's very time consuming, and I think I missed
> some bad kernel because I didn't let enough time to the system to panic.
> 
> But I'm still on...
> 
I usually hit it at boot time. Maybe one out of five times. I'll take a stab
at bisecting today...

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