netdev - VLAN over GRE segfault

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Message-ID: <4D830AF9.8040007@diddi.se>
Date:	Fri, 18 Mar 2011 08:34:17 +0100
From:	Diddi Oscarsson <diddi@...di.se>
To:	netdev@...r.kernel.org
Subject: VLAN over GRE segfault

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Hello!

I was trying to get ethernet over GRE to work when I found an obvious
way NOT to do it.
Basically I created a VLAN interface from the GRE interface (even
though I had my fair doubts it would work) which gave me a nice segfault.
The problem with this is that after the segfault, new network
connections cannot be made (ping, ssh, http, whatever) and a reboot of
the computer is necessary.
I think an error message needs to be added when trying an operation
like this.

My system:
Linux colalapp 2.6.37-2-amd64 #1 SMP Sun Feb 27 10:12:22 UTC 2011
x86_64 GNU/Linux
ip utility, iproute2-ss110107
Debian unstable

Steps to reproduce:
ip tunnel add gre0 mode gre
ip link add link gre0 name vlan1 type vlan id 1
ip link set vlan1 address 00:15:14:13:12:11
ip link set gre0 up
ip link set vlan1 up
<CRASH>
Attached in the mail is an output from dmesg right after the segfault.

Regarding ethernet over gre, I've just found out about gretap which
I'm testing right now.
BR
Diddi
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