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In the process of upgrading to a 2.4.0 kernel, I started receiving the above error when I tried to configure any network device (eth0, lo, ppp0, dummy0, etc). Thinking it was a problem with the new kernel, I booted back to a 2.2 kernel, where the problem started appearing as well. I've gone back to 2.4.0, pulled out everything extra possible, and I'm still getting the error. Interfaces appear in an "ifconfig -a" and in /proc/net/dev, can be shown by "ifconfig INTERFACE", but any attempt to change a setting, like IP address and I get:
# ifconfig lo 127.0.0.1
SIOCSIFADDR: Bad file descriptor
lo: unknown interface: Bad file descriptor
# ifconfig lo down
lo: unknown interface: Bad file descriptor
Any help is appreciated.
-egon
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