[v3.7 Regression] [SCSI] sd: Implement support for WRITE SAME
joseph.salisbury at canonical.com
Fri Dec 14 20:30:44 UTC 2012
A bug was opened against the Ubuntu kernel. After a kernel bisect,
it was found that reverting the following commit resolved this bug:
Author: Martin K. Petersen <martin.petersen at oracle.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.
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