linux-kernel - [v3.7 Regression] [SCSI] sd: Implement support for WRITE SAME

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Date:	Fri, 14 Dec 2012 15:30:44 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	martin.petersen@...cle.com
CC:	Kernel Team <kernel-team@...ts.ubuntu.com>,
	linux-kernel@...r.kernel.org, snitzer@...hat.com,
	jgarzik@...hat.com, JBottomley@...allels.com
Subject: [v3.7 Regression]  [SCSI] sd: Implement support for WRITE SAME

Hi Martin,

A bug was opened against the Ubuntu kernel[0].  After a kernel bisect, 
it was found that reverting the following commit resolved this bug:

commit 5db44863b6ebbb400c5e61d56ebe8f21ef48b1bd
Author: Martin K. Petersen <martin.petersen@...cle.com>
Date:   Tue Sep 18 12:19:32 2012 -0400
[SCSI] sd: Implement support for WRITE SAME

The regression was introduced as of v3.7-rc7.

The bug can be reproduced with the following commands, which will 
operate on a virtual scsi_debug device, so they won't change any data on 
the test system. However, this will completely crash the system:

sudo modprobe scsi_debug
sudo luksformat -t ext4 /dev/sdb <- Or whatever device gets assigned 
after inserting scsi_debug.
sudo cryptsetup luksOpen /dev/sdb treasure

Everything works fine up to here, but the following will cause the crash:

sudo mount /dev/mapper/treasure /mnt

The bug can be reproduced on bare metal, in a VM and on i386 or amd64.

I see that you are the author of this patch, so I wanted to run this by 
you.  I was thinking of requesting a revert for v3.7, but I wanted to 
get your feedback first.

Thanks,

Joe

[0] https://bugs.launchpad.net/bugs/1089818
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