Bug 125947 - kernel-2.6.6-1.427 pppd and modems unregister_netdevice message
kernel-2.6.6-1.427 pppd and modems unregister_netdevice message
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
athlon Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Depends On:
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Reported: 2004-06-14 10:14 EDT by Motor
Modified: 2007-11-30 17:10 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-06-19 08:18:02 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Motor 2004-06-14 10:14:35 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6)
Gecko/20040510 Galeon/1.3.14

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:

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
Comment 1 Craig Routledge 2004-06-17 22:11:27 EDT
As I understand it, this has been resolved in kernel build 435.  I and
others experienced the same problem which has been fixed with the
latest kernel update.

From the changelog:
* Sun Jun 13 2004 Arjan van de Ven <arjanv@redhat.com>
- add patch from DaveM to fix the ppp-keeps-iface-busy bug
Has this fixed it for you?
Comment 2 Motor 2004-06-18 05:07:22 EDT
Yes, it seems to be fixed. The problem does not occur for me after
installing 435.

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