linux-kernel - Re: USB device cannot be reconnected and khubd "blocked for more than 120 seconds"

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Date:	Sun, 13 Jan 2013 13:09:11 +0100
From:	Alex Riesen <raa.lkml@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>,
	Jens Axboe <axboe@...nel.dk>
Cc:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: USB device cannot be reconnected and khubd "blocked for more than
 120 seconds"

On Sat, Jan 12, 2013 at 11:52 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Sat, 12 Jan 2013, Alex Riesen wrote:
>> Now, who would be interested to handle this kind of misconfiguration ...
>
> So the whole thing was a false alarm?

Yes, almost. What about khubd hanging when machine is shutdown?

> Maybe you should report to the block-layer maintainers that it's
> possible to mess up the system by building an elevator as a module.
> That sounds like the sort of thing they'd be interested to hear.

Hi Jens,

may I point you at this problem report:

http://thread.gmane.org/gmane.linux.kernel/1420814

It is surely a misconfiguration on my part (the used io scheduler
configured as a module), but the behavior is somewhat problematic
anyway: at least in this case USB storage is essentially locked up.

Regards,
Alex
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