linux-kernel - Re: khubd taking 100% CPU after unproperly removing USB webcam

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Message-Id: <200701161046.29262.oneukum@suse.de>
Date:	Tue, 16 Jan 2007 10:46:29 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	"Jerome Lacoste" <jerome.lacoste@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: khubd taking 100% CPU after unproperly removing USB webcam

Am Dienstag, 16. Januar 2007 10:10 schrieb Jerome Lacoste:
> Hi,
> 
> I unplugged my (second) webcam, forgotting to stop ekiga, and khubd is
> now taking 100% CPU.
> 
> - lsusb doesn't return
> - /etc/init.d/udev restart didn't resolve the problem.
> 
> Is that a problem one may want to investigate or should I just forget
> about it (problem being cause by a user error)?

If your are using this driver
http://mxhaard.free.fr/download.html

then it appears that it most likely hanging here:

	for (n = 0; n < SPCA50X_NUMFRAMES; n++)
		if (waitqueue_active(&spca50x->frame[n].wq))
			wake_up_interruptible(&spca50x->frame[n].wq);
	if (waitqueue_active(&spca50x->wq))
		wake_up_interruptible(&spca50x->wq);
	gspca_kill_transfert(spca50x);
	PDEBUG(3, "Disconnect Kill isoc done");
	up(&spca50x->lock);
	while (spca50x->user)
		schedule();

This driver's disconnect handling is buggy. As this is an out of tree
driver, please contact the original author.

	Regards
		Oliver
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