Bug#498489: linux-image-2.6.26-1-686: disconnecting USB cellphone while using it for PPP causes oops

[Moritz Muehlenhoff <jmm@inutil.org>]

On Wed, Sep 10, 2008 at 01:44:28PM +0100, Simon McVittie wrote:
> Package: linux-image-2.6.26-1-686
> Version: 2.6.26-4
> Severity: normal
> 
> When using a 3G phone over USB for PPP connectivity, the kernel oopses if
> the phone is accidentally unplugged (or, as in the attached log, its battery
> runs out) before pppd has been terminated. After this happens, ppp does not
> work (and new pppd processes become unkillable) until after the next reboot.
> 
> This oops trace results from a Nokia 6120 rebooting due to a low battery
> while it's in use by an i386 laptop (in the oops trace you can see it
> disconnecting from USB and then reconnecting), but I've seen the same symptoms
> when the phone was unplugged rather than rebooting.
> 
> I've also seen the same symptoms when a Nokia 6233 was unplugged from an
> amd64 with etch's 2.6.18 kernel.
> 
> The nearest I can find upstream is
> http://bugzilla.kernel.org/show_bug.cgi?id=4407 which was apparently
> fixed back in 2.6.13 - perhaps by 2.6.18 it had crept back in?

Sorry for the late followup, we have a large backlog and are currently
sorting things out for Squeeze.

Does this still occur with 2.6.32? If so, we should report it upstream.

Cheers,
        Moritz