Re: System hangs when using USB 3.0 HD with on Ubuntu

[Douglas Gilbert <dgilbert-qazKcTl6WRFWk0Htik3J/w@public.gmane.org>]

Alan Stern wrote:
> On Fri, 26 Mar 2010, Sarah Sharp wrote:
> 
>> I think the amount of information is fine, but I'm not sure why the
>> device would respond with a stall to this particular command, so I'm
>> CC'ing the USB storage list and SCSI list.  Does anyone know what the
>> third command is?  The USB storage driver reports it as an "unknown
>> command".  I can see from scsi.h that 0x85 is the code for ATA_16, but
>> I'm not sure what that command actually does.
> 
> I have never heard of any kernel driver issuing either the BLANK 
> command or an ATA_16 pass-through command.  It almost certainly is a 
> user program doing this, but I don't know which one.
> 
> Booting into a minimal userspace environment (for example, with 
> init=/bin/bash) might prove this.
> 
> No doubt the reason the drive fails to respond is because it can't 
> handle these commands and gets fatally confused.

The ATA commands seem to be:
    IDENTIFY DEVICE  (via the ATA_12 tunnel)
    SET FEATURES     (via the ATA_16 tunnel)
    IDENTIFY DEVICE  (via the ATA_16 tunnel)

The last one fails but that could be caused by
the second last one. Doesn't look like smartd.
My money would be on udev.
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