linux-kernel - Re: block: Always check queue limits for cloned requests

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Message-ID: <20151129114956.GA321@x4>
Date:	Sun, 29 Nov 2015 12:49:56 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	Hannes Reinecke <hare@...e.de>, Jens Axboe <axboe@...com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Christoph Hellwig <hch@....de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ewan Milne <emilne@...hat.com>, Jeff Moyer <jmoyer@...hat.com>
Subject: Re: block: Always check queue limits for cloned requests

On 2015.11.26 at 08:11 -0500, Mike Snitzer wrote:
> On Thu, Nov 26 2015 at  2:46am -0500,
> Hannes Reinecke <hare@...e.de> wrote:
> 
> > When a cloned request is retried on other queues it always needs
> > to be checked against the queue limits of that queue.
> > Otherwise the calculations for nr_phys_segments might be wrong,
> > leading to a crash in scsi_init_sgtable().
> > 
> > To clarify this the patch renames blk_rq_check_limits()
> > to blk_cloned_rq_check_limits() and removes the symbol
> > export, as the new function should only be used for
> > cloned requests and never exported.
> > 
> > Cc: Mike Snitzer <snitzer@...hat.com>
> > Cc: Ewan Milne <emilne@...hat.com>
> > Cc: Jeff Moyer <jmoyer@...hat.com>
> > Signed-off-by: Hannes Reinecke <hare@...e.de>
> 
> Patch looks good.  Thanks for getting to the bottom of this.
> 
> Jens, please add these extra tags when you pick this up:
> 
> Fixes: e2a60da74 ("block: Clean up special command handling logic")
> Cc: stable@...r.kernel.org # 3.7+
> Acked-by: Mike Snitzer <snitzer@...hat.com>

I'm still seeing the issue (BUG at drivers/scsi/scsi_lib.c:1096!) even
with this patch applied.

markus@x4 linux % git describe
v4.4-rc2-215-g081f3698e606

-- 
Markus
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