Red Hat Bugzilla – Bug 149316
Server reboot causes Unregister-netdevice errors
Last modified: 2015-01-04 17:17:10 EST
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Description of problem:
We run FC3 servers as VPN servers. If the server is rebooted or
shutdown whilst a virtual PPP interface is still present then the
console repeatedly shows:
Unregister-netdevice: waiting for ppp1 to become free. Usage count = 2
The 'count' may vary at each reboot. The system does not
reboot/shutdown, so we have to do a power off and restart.
NOTE: the kernel has a patch applied to it to support MPPE/MPPC for
our VPN service. (Patch by Jan Dubiec can be found at:
We had this problem at FC2 but only ran that for a short time before
upgrading to FC3 - hence it wasn't reported as an FC2 bug.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install FC3 with MPPE/MPPC patch.
2. Connect to server over vpn (using pptp client); this will cause a
virtual PPP interface to be created.
3. Reboot server using 'reboot' command.
Actual Results: Server gets tied up with console messages. Server
Expected Results: Server should shutdown all network interfaces and
This hasn't been 'tested' as such since our servers are live. However,
we have had cause to reboot the servers recently and this problem has
always occurred. (Yes, we do warn users that we will be rebooting but
there is always someone who doesn't logout. Hence a ppp interface is
usually still present at reboot time.)
An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which
may contain a fix for your problem. Please update to this new kernel, and
report whether or not it fixes your problem.
If you have updated to Fedora Core 4 since this bug was opened, and the problem
still occurs with the latest updates for that release, please change the version
field of this bug to 'fc4'.
Okay I will try the new kernel. However, the servers have a modified kernel (for
mppe/mppc) so it will take a little time.
Yes, the latest FC3 kernel (2.6.12-1.1372_FC3) fixes the problem. I rebooted the
server and logged in as a vpn user (which creates a virtual ppp interface).
Twice shutting down the server from the console worked fine, despite the ppp
interface being present. I also rebooted the server remotely, with a ppp
interface present, and it rebooted fine - no error messages and no looping.
As far as I am concerned you can close this bug report.