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

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Date:	Sun, 29 Nov 2015 18:05:06 +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 2015.11.29 at 11:49 -0500, Mike Snitzer wrote:
> On Sun, Nov 29 2015 at 11:15am -0500,
> Markus Trippelsdorf <markus@...ppelsdorf.de> wrote:
> 
> > On 2015.11.29 at 16:43 +0100, Hannes Reinecke wrote:
> > > On 11/29/2015 12:49 PM, Markus Trippelsdorf wrote:
> > > > 
> > > > 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
> > > > 
> > > Can you generate a crashdump?
> > > I would need to cross-check with the other dumps I'm having to figure
> > > out if this really is the same issue.
> > > There have been other reports (and fixes) which show we're fighting
> > > several distinct issues here.
> > 
> > Unfortunately no. The crash happens on the disk where I store my log
> > files. And after it happened the magic SysRq keys don't work anymore.
> > 
> > The crash only happens on my spinning rust drive that uses the cfq
> > scheduler. The SSDs (deadline) are fine.
> > 
> > The BUG happens reproducibly when building http://www.sagemath.org/ on
> > that drive.
> 
> Are you using DM multipath?  If unsure, please let us know which
> device(s) map to the "spinning rust drive", and provide output from:
> lsblk

No, I'm not using DM multipath. 

/dev/sdb2 on /var type btrfs (rw,relatime,compress=lzo,noacl,space_cache)
/dev/sdb2      btrfs     1.9T  904G  944G  49% /var

scsi 1:0:0:0: Direct-Access     ATA      ST2000DM001-1CH1 CC29 PQ: 0 ANSI: 5
sd 1:0:0:0: [sdb] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
sd 1:0:0:0: [sdb] 4096-byte physical blocks
sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: Attached scsi generic sg1 type 0
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Model Family:     Seagate Barracuda 7200.14 (AF)
Device Model:     ST2000DM001-1CH164

-- 
Markus
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