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

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Message-ID: <CALxABCbLmsg-gt-5MzQJv-Sy1qqnWh-Vr6HUutq=DzNO8M+s1A@mail.gmail.com>
Date:	Sat, 12 Jan 2013 20:39:36 +0100
From:	Alex Riesen <raa.lkml@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
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 6:37 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Sat, 12 Jan 2013, Alex Riesen wrote:
>> One more detail: I usually use the "noop" elevator. That time it was
>> the "deadline". And I just reproduced it easily with "deadline".
>
> I doubt the elevator has anything to do with this.

But it looks like it does: just using the deadline elevator is a sure way
to reproduce the bug. The system always recovers (sometimes after a while)
with "noop".
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