linux-kernel - Re: Regression 3.0-rc6+ : khubd blocked (usbnet_cdc

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Date:	Wed, 6 Jul 2011 13:46:47 -0700
From:	Greg KH <gregkh@...e.de>
To:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Éric Piel <E.A.B.Piel@...elft.nl>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Regression 3.0-rc6+ : khubd blocked (usbnet_cdc_unbind)

On Wed, Jul 06, 2011 at 06:44:25PM +0200, Arkadiusz Miskiewicz wrote:
> On Wednesday 06 of July 2011, Alan Stern wrote:
> > On Wed, 6 Jul 2011, Éric Piel wrote:
> > > Hello,
> > > It seems I'm very unlucky this week and I've come across to what looks
> > > like a second regression in the kernel. I'm running a version few
> > > commits after 3.0-rc6, which includes commit e534c5b831c8 "fix
> > > regression occurring during device removal".
> > > 
> > > When I plug/unplug/plug a mobile phone, after waiting a few minutes I
> > > get a "task khubd:621 blocked for more than 120 seconds." Note that it's
> > > directly connected to my laptop, not via an external hub (although the
> > > bug also happens with an external hub).
> > > 
> > > Below is the whole dmesg log (with usb debug messages on)
> > > 
> > > Let me know if you need me to investigate more, or maybe there is
> > > already a fix for that bug?
> > 
> > Ah -- this stack dump points out the reason for the hang.  It looks
> > like that "fix regression..." commit didn't go far enough; I neglected
> > the fact that interfaces can be unbound out of order when a driver
> > claims multiple interfaces.
> > 
> > Adding this patch on top of that commit should fix this.  Let me
> > know what you both get.
> 
> This one makes usb working after resume from ram (current Linus git + this 
> patch).

Thanks so much for testing.

Alan, care to resend this to me so I can get it to Linus?

greg k-h
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