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

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On Wed, 31 Mar 2010, Jonas Schwertfeger wrote:

> Since this seems to have become a udev issue I'm brining the
> hotplug/udev list into the loop.
> 
> A brief recap for the hotplug list readers: I'm experiencing issues
> with a USB 3.0 hard drive (Buffalo HD-HXU3) on kernel 2.6.32.9 with
> udev 151. When connected the device seems to be recognized and
> registered with xHCI and USB core correctly but then responds to a
> bulk transfer with a stall. We narrowed the issue down to udev by
> stopping the udev daemon, connecting the device and mounting it
> manually. If done this way the drive works fine. However, if udevd is
> running the device stalls. Below is an excerpt of the conversation
> involving the USB core, the USB storage and the SCSI list.
> 
> Any idea what command (most likely coming from udev) could cause the
> drive to stall and what could be done about it?

More specifically, what program issues ATA-passthrough commands?  And 
what can be done to prevent it from doing so in cases where these 
commands cause the device to crash?

Alan Stern

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