Re: waiting for ppp0 to become free (Re: ppp0 out of control)

From: Aurélien GÉRÔME (ag_at_roxor.be)
Date: 01/26/05

  • Next message: Emmanuel Fleury: "[2.6.10] PCMCIA/CardBus Wifi Card Problem" 
    Date:	Wed, 26 Jan 2005 21:31:18 +0100
To: linux-kernel@vger.kernel.org

    On Wed, Jan 26, 2005 at 10:44:22AM +0100, Janos Farkas wrote:
    > On 2005-01-21 at 15:44:44, Aurélien GÉRÔME wrote:
    > > I am running 2.6.10 from kernel.org on Debian Sid ppc/x86, the same
    > > issue occurs with 2.6.9. Though, 2.6.8.1 and previous are fine.
    > >
    > > When my ISP connection via PPPoE (kernel side) goes down, reconnection
    > > does not occur, and the kernel displays continuous:
    > >
    > > kernel: unregister_netdevice: waiting for ppp0 to become free. Usage count = 1
    >
    > BTW, I have seen many cases when this symptom annoyed me too, the last
    > one is that my shutdown scripts tried unloading the network driver
    > modules. Is your setup doing this by any chance? In my case,
    > apparently there were conntrack entries keeping the device in use,
    > which is almost useless when preparing to shutdown :)

    Actually, it happens after my ISP's LCP echos are not coming anymore,
    and then when pppd try to reconnect.

    > OTOH, I couldn't find a way to flush those conntracks, so I worked
    > around it by not rmmoding ethernet drivers.

    I have conntrack modules loaded too. I will try removing 8139too
    (on x86) and sungem (on ppc) if the issue occurs again. By the way,
    I also have IPv6 loaded, since I use a dual-stacked connection with
    native IPv6. How lucky I am! :)

    > In your case, it's probably conntrack too, I'd presume you are using
    > that PPPoE machine as a masquerading gateway, which by definition needs
    > connection tracking... I'm not sure either if this is a "real" change,
    > I only vaguely recollect as some moons earlier this wasn't a problem in
    > 2.6.

    Yep, 2.6.8.1 works fine, this issue appears on 2.6.9 and 2.6.10. I
    switched to a Debian 2.6.10 kernel for security reasons, and
    the issue has not come yet. I had a glance at the changelog and
    saw some network related patches. This is the -as patchset, see
    <http://kerneltrap.org/node/4545> about it.

    Cheers.

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