linux-kernel - Re: Crash on WRITE SAME

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Message-ID: <alpine.LRH.2.02.1407021423240.20183@file01.intranet.prod.int.rdu2.redhat.com>
Date:	Wed, 2 Jul 2014 14:29:05 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
cc:	Sagi Grimberg <sagig@...lanox.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Mike Christie <michaelc@...wisc.edu>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: Crash on WRITE SAME



On Wed, 2 Jul 2014, Christoph Hellwig wrote:

> On Wed, Jul 02, 2014 at 02:05:14PM -0400, Mikulas Patocka wrote:
> > Hi Sagi
> > 
> > Your commit d77e65350f2d82dfa0557707d505711f5a43c8fd causes crash on SCSI 
> > WRITE SAME command (it can be triggered by issuing the BLKZEROOUT ioctl). 
> > The crash happens in iscsi_tcp_segment_done because sg_next returns NULL.
> 
> Martin already fixes this over a week ago, we're just waiting for James
> to send a pull request to Linus.
> 
> Get this fix from the core-for-3.16 branch of
> git.infradead.org/users/hch/scsi-queue.git for now.

I see.

And what about protection information for commands that transfer partial 
sectors? (for example, UMAP transfers 24 bytes). Should 
scsi_transfer_length return 24 or 32 in this case?

Mikulas
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