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Date: Fri, 28 Nov 2008 15:50:10 -0800
From: Greg KH <gregkh@suse.de>
To: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, linux-usb@vger.kernel.org,
       netdev@vger.kernel.org
Subject: Re: option: oops on unload (2.6.27.4)
Message-ID: <20081128235010.GB27130@suse.de>
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On Fri, Nov 28, 2008 at 11:01:43PM +0100, Marcin Slusarz wrote:
> On Fri, Nov 28, 2008 at 01:50:21PM -0800, Greg KH wrote:
> > On Fri, Nov 28, 2008 at 10:32:59PM +0100, Marcin Slusarz wrote:
> > > It's not new bug - I've seen this oops many times but on much older
> > > kernels (2.6.18, probably on 2.6.24 too).
> > > 
> > > I tried to rmmod it (and all usb modules) because sometimes it helps when
> > > modem disconnects and can't connect again.
> > > 
> > > [25350.138850] BUG: unable to handle kernel paging request at e0857fb4
> > > [25350.138866] IP: [<e0a22e80>] :usbcore:unlink1+0xab/0xb9
> > > [25350.138921] *pde = 1f80f067 *pte = 00000000 
> > > [25350.138934] Oops: 0000 [#1] PREEMPT SMP 
> > > [25350.138945] Modules linked in: r128 drm ipt_REDIRECT ipt_MASQUERADE xt_tcpudp xt_multiport iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack iptable_filter ip_tables ppp_deflate zlib_deflate zlib_inflate bsd_comp ppp_async crc_ccitt ppp_generic slhc ipt_REJECT x_tables loop option usbserial snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_timer snd 8139cp i2c_i801 floppy 8139too 3c59x psmouse intel_agp soundcore snd_page_alloc sg mii usbcore agpgart i2c_core sr_mod evdev dcdbas cdrom [last unloaded: uhci_hcd]
> > > [25350.139052] 
> > > [25350.139059] Pid: 2807, comm: pppd Not tainted (2.6.27.4 #5)
> > > [25350.139065] EIP: 0060:[<e0a22e80>] EFLAGS: 00010286 CPU: 0
> > > [25350.139088] EIP is at unlink1+0xab/0xb9 [usbcore]
> > 
> > Yes, I've seen this before, what module are you unloading, uhci-hcd or
> > the option module?
> 
> I don't know :| I invoked "rmmod option usbserial uhci_hcd usbcore"

Try them one at a time:
	rmmod option
	rmmod uhci-hcd

that should be all you need if you really need to remove all usb
devices.

But why do you need to do this?

thanks,

greg k-h
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