linux-kernel - Re: [BUG] Cannot boot any kernel after 2.6.27 if a 256 byte sector SCSI disk is attached

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Date:	Thu, 27 May 2010 10:53:13 -0400
From:	Mark Hounschell <markh@...pro.net>
To:	linux-kernel@...r.kernel.org
CC:	markh@...pro.net, linux-scsi@...r.kernel.org,
	James.Bottomley@...senPartnership.com,
	Mark Hounschell <dmarkh@....rr.com>
Subject: Re: [BUG] Cannot boot any kernel after 2.6.27 if a 256 byte sector
 SCSI disk is attached

On 05/26/2010 02:34 PM, Mark Hounschell wrote:
> My application uses SCSI disks of 256, 512, 768, and 1024 sector sizes. It
> uses the sg_io interface to talk to these devices. As of 2.6.27 if any SCSI
> disk is attached that has been formatted with a 256 byte sector size, the
> boot process hangs when it gets to the point of discovering USB devices.
> 512, 768, and 1024 sector sizes do not seem to trigger this.
> 
> I have bisected this problem to the following commit:
> 
> # git bisect good
> 427e59f09fdba387547106de7bab980b7fff77be is first bad commit
> commit 427e59f09fdba387547106de7bab980b7fff77be
> Author: James Bottomley <James.Bottomley@...senPartnership.com>
> Date:   Sat Mar 8 18:24:17 2008 -0600
> 
>     [SCSI] make use of the residue value
> 
>     USB sometimes doesn't return an error but instead returns a residue
>     value indicating part (or all) of the command wasn't completed.  So if
>     the driver _done() error processing indicates the command was fully
>     processed, subtract off the residue so that this USB error gets
>     propagated.
> 
>     Cc: Alan Stern <stern@...land.harvard.edu>
>     Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> 
> :040000 040000 d3bad84ebe1bc231e8e7d6267907ca62fd4d0dcd
> c85f8cb8bd4910724f0101e41054555980727e16 M      drivers
> 
> Now, what the hell USB has to do with my SCSI disks is beyond me. I have a
> feeling that this commit is just uncovering another problem. I've attached
> a dmesg from a working kernel and pointed out where the boot hangs and my
> SCSI disk light is on solid. Once it turns on solid the only recourse is to
> recycle power to the disk. The reset button does nothing to it. In fact a
> second will not even see the device because it is out to lunch. Not even a
> SCSI bus reset clears what ever has happened to the disk.
> 
> This does the same thing on a 2.6.34 kernel also. Anything I can do to
> help, I'm available.
> 
> Thanks and regards
> Mark
> 

I've attached the output from a serial console while trying to boot the
kernel with the above commit in. These disks have no partition table BTW.

Thanks
Mark

View attachment "bootlog.txt" of type "text/plain" (114720 bytes)