From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 16058] [BUG] Cannot boot any kernel from 2.6.27 on if a 256
byte sector SCSI disk is attached
Date: Thu, 27 May 2010 20:31:19 GMT
Message-ID: <201005272031.o4RKVJNt028451@demeter.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=16058
--- Comment #1 from Alan Stern 2010-05-27 20:31:16 ---
On Thu, 27 May 2010, Andrew Morton wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=16058
>
> Summary: [BUG] Cannot boot any kernel from 2.6.27 on if a 256
> byte sector SCSI disk is attached
> 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. 512, 768, and 1024 byte sector disks
> do not seem to trigger this. The disks in use do NOT have a partition table.
> They are being used by out applications via the sg_io interface only.
>
> A 2.6.26.8 kernel works fine.
>
> I have bisected this problem to the following commit:
>
> # git bisect good
> 427e59f09fdba387547106de7bab980b7fff77be is first bad commit
> commit 427e59f09fdba387547106de7bab980b7fff77be
> Author: James Bottomley
> 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
> Signed-off-by: James Bottomley
>
> :040000 040000 d3bad84ebe1bc231e8e7d6267907ca62fd4d0dcd
> c85f8cb8bd4910724f0101e41054555980727e16 M drivers
>
> Now, what 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 bootlog from a serial console that ends where the boot hangs.
>
> The does the same thing on a 2.6.34 kernel. Anything I can do to help, I'm
> available.
I'd guess that this has nothing to do with the sector size. Instead
the drive probably reports a non-zero residue when it shouldn't. Can
you add some debugging printk's to the patch to find out in more detail
what's going wrong?
Alan Stern
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