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Description of problem:
kernel-2.6.6-1.427 pppd and modems unregister_netdevice message

I've just install Fedora Core 2 (upgrade from FC1) and been using it
with no problems. However, after installing kernel-2.6.6-1.427 it
seems to have developed a strange problem with pppd. I'm using a 56k
modem, which I switch off when I want to disconnected from the
internet. With previous kernels (including 2.6.5-1.358) this didn't
cause any problems... but after installing kernel-2.6.6-1.427, I
started to get this message displayed at the console when switching
off the modem:

unregister_netdevice: waiting for ppp0 to become free. Usage count = 1

6 or 7 times with a few seconds inbetween each message. This lasts for
about 30 seconds and then clears. The big problem is that, while this
is occuring, no GNOME applications can be launched -- or rather they
do pop up eventually, just not until this "unregister_netdevice"
logjam has cleared.

It doesn't seem to occur every time the modem is switched off, and
switching back to kernel 2.6.5-1.358 seems to make the problem go away
(at least, I haven't seen it yet). 



Version-Release number of selected component (if applicable):


How reproducible:
Sometimes

Steps to Reproduce:
1. Connect to internet via modem
2. Run apps (say pan newsreader) which keep a connection
3. Switch off modem
    

Additional info:

Newbie speculation:

It would seem that if an app (say the pan newsreader) has a connection
open, then it causes this message and the subsequent blockage in app
start up because they try to lookup the hostname?


System specs:

Gigabyte k7 triton motherboard, with VIA KLE133 chipset.
AMD XP2000+
512Mb RAM
Matrox G550 gfx card.
56k modem