linux-kernel - Re: [Regression] process hangs due to "USB: EHCI: work around silicon bug in Intels EHCI controllers"

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Date:	Tue, 19 Mar 2013 19:29:43 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andreas Bombe <aeb@...ian.org>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Regression] process hangs due to "USB: EHCI: work around silicon
 bug in Intels EHCI controllers"

On 03/19/2013 06:03 PM, Andreas Bombe wrote:
> The named commit (6402c796d3) causes a process to hang indefinitely in
> usb_kill_urb(). Reverting it fixes the problem. The bug also prevents
> suspend/shutdown/reboot from completing, presumably due to the hanging
> process.
> 
> (Cc'ing Stephen Warren because I only found his report after I bisected
> it myself. Do you also see a blocked process?)

Yes, I believe the symptoms we're both seeing are identical.

> This is the hanging process on my system:
> [  240.364085] INFO: task colord-sane:3619 blocked for more than 120 seconds.
...
> [  240.364118] Call Trace:
> [  240.364127]  [<ffffffff81685af0>] schedule+0x65/0x67
> [  240.364132]  [<ffffffff8141a235>] usb_kill_urb+0xb5/0xd3
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