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

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Message-ID: <5a2cf1f60701160203j6dc5911fsddcb1e1babc6ae98@mail.gmail.com>
Date:	Tue, 16 Jan 2007 11:03:39 +0100
From:	"Jerome Lacoste" <jerome.lacoste@...il.com>
To:	"Oliver Neukum" <oneukum@...e.de>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: khubd taking 100% CPU after unproperly removing USB webcam

On 1/16/07, Oliver Neukum <oneukum@...e.de> wrote:
> 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.

OK thanks for your answer.

I also found out that ekiga was still running. I killed it and that
stopped the hang.

Jerome
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