linux-kernel - Re: Regression 3.0-rc5+ : khubd blocked

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Message-ID: <20110701132919.GB8902@suse.de>
Date:	Fri, 1 Jul 2011 06:29:19 -0700
From:	Greg KH <gregkh@...e.de>
To:	Éric Piel <E.A.B.Piel@...elft.nl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Regression 3.0-rc5+ : khubd blocked

On Fri, Jul 01, 2011 at 02:45:38PM +0200, Éric Piel wrote:
> Hello,
> I've come across to what looks like a regression in the kernel a
> few commits after 3.0-rc5.
> 
> When I turn off a usb hub, to which my mouse and keyboard are connected,
> and then turn it on again, they are not detected again. After unplugging
> it and waiting a few minutes I get a "task khubd:621 blocked for more
> than 120 seconds."
> 
> I haven't investigated much. It seems reproducible here on my x86_64
> laptop. It doesn't seem to happen on a 3.0-rc4. Maybe important, my
> kernel already has commit 2e34b429a404675dc4fc4ad2ee339eea028da3ca
> "Merge branch 'usb-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6"
> 
> Let me know if you need me to investigate more, or maybe there is
> already a fix for that bug?

Can you run 'git bisect' to track it down to the exact patch that causes
the problem?

thanks,

greg k-h
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