From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <jejb@linux.vnet.ibm.com>
Subject: Re: SCSI regression in 4.11
Date: Tue, 28 Feb 2017 22:20:58 -0800
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To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>, Linus Torvalds <torvalds@linux-foundation.org>, "Martin K. Petersen" <martin.petersen@oracle.com>, "K. Y. Srinivasan" <kys@microsoft.com>, Dexuan Cui <decui@microsoft.com>, Long Li <longli@microsoft.com>, Josh Poulson <jopoulso@microsoft.com>, v-adsuho@microsoft.com, linux-scsi@vger.kernel.org, Haiyang Zhang <haiyangz@microsoft.com>

On Tue, 2017-02-28 at 17:25 -0800, Stephen Hemminger wrote:
> [    1.346023] hv_storvsc:  IO cmd 0x12 0x0 0x0 scsi status 0x0 srb
> status 0x20 length 36
> [    1.352913] inquiry data: 00000000: 00 aa be f1 5c 98 ff ff f0 64
> 02 89 ff ff ff ff
> [    1.356543] inquiry data: 00000010: 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00
> [    1.359996] inquiry data: 00000020: 00 00 00 00
> [    1.361835] scsi host1: scsi scan: INQUIRY result too short (5),
> using 36
> [    1.361888] hv_storvsc:  IO cmd 0xa0 0x0 0x0 scsi status 0x0 srb
> status 0x1 length 16
> [    1.362307] hv_storvsc:  IO cmd 0x12 0x0 0x0 scsi status 0x0 srb
> status 0x1 length 36
> [    1.362308] inquiry data: 00000000: 00 23 34 f1 5c 98 ff ff f0 64
> 02 89 ff ff ff ff
> [    1.362309] inquiry data: 00000010: 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00
> [    1.362309] inquiry data: 00000020: 00 00 00 00
> [    1.377423] scsi 1:0:0:1: Direct-Access                           
>          PQ: 0 ANSI: 0

Well, this pinpoints the fault to the block uncopy, I think.  The
Inquiry data is clearly correct in the page frame, so it's not getting
copied to the scsi_execute() buffer for some reason.

James