[Click] ToDevice error: packet too small (len 0, tailroom 48, need 60), had to copy

[Hamid Farhadi]

(sorry to initiate another thread for the same problem)
Hi,

How to reproduce the error:

1- install Click and OVS
2- make two Taps(tap0, tap1) using OVS and bring them up using ifconfig. 
do not do any other OVS config.
3- run this config in kernel mode:

FromDevice(eth0) ->Queue -> Strip(14) -> EtherEncap(0x0800, eth0 , tap0) 
-> ToDevice(tap0);

4- send few packets of any kind to eth0
5-CPU goes up and system crashes.

Notes:
1- console output is attached. I cant grab logs. nothing is saved in 
/var/log. so I just got a big pic, sorry. I miss a few lines from the 
beginning, but I think all are repeating "Dead loop on virtual device 
tap0 ...". the end of the log is the end of messages showed on the screen.
2- I tried both 2.6.35 and 38 on ubuntu 10.10 and 11.04 receptively
3- OVS is 1.2.2 and click is from the git (kohler-click-81e0196).
4- the same config works fine in usermode
5- I tested the same scenario on OVS without click: eth0 > OVS > tap1. 
it works.
6- pls let me know if I can do further testing or better logging.

any help please?

Hamid

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