unregister_netdevice: waiting for ppp546 to become free. Usage count = 1 (using tbf)

[Ray Van Dolson]

Been seeing this problem from time to time--

After running /sbin/reboot the following message (or similar) loops
continuously and the only way to recover is to hard reboot the system.

unregister_netdevice: waiting for ppp546 to become free. Usage count = 1

We are using "tc" to do traffic shaping with the tbf (tocket bucket
filter).  Kernel is 2.6.9.

I found the following which appears to be similar:

http://marc.theaimsgroup.com/?l=linux-kernel&m=109317866203856&w=2

Except that it relates to cbq specifically.  Could there be an issue with
the tbf code as well?

Ray
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