We recently upgraded QuintanaLibre to r36655 and we started seeing this
strange behavior, where some nodes are suddenly inaccesible from others.
It seems quite random. A node that's not accesible through one neighbor
at some point in time, is accessible through others. After a full
network reset, the previous bad path may be fixed and a different one
broken.


Here's a series of tests I made to try to understando the problem:

http://pastebin.com/Qq4D8KGQ

summary:
arping and batman OGMs are getting through while regular unicast traffic
(ping or batctl ping for example) are not.

ping through fe80 addresses of associated interfaces also fails (this
discards batman as the source of the problem).

...see the pastebin for actual tests.

The same network was working fine with r33815.

Please let me know if some other information would be useful for
debugging this problem. I'll leave the network in r36655 until tomorrow
in case it's useful to get more data, then I'll revert revision because
people are mad :) and it's a production net.



Cheers!

Nico

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