netdev - Freeing alive fib_info caused by ebc0ffae5

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Date:	Thu, 04 Nov 2010 21:23:06 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	netdev@...r.kernel.org
Cc:	eric.dumazet@...il.com
Subject: Freeing alive fib_info caused by ebc0ffae5

Hi all,

I'm running Linus' latest or thereabouts (ff8b16d), and I'm seeing
"Freeing alive fib_info" messages, from free_fib_info().

Actually I only get one per boot, when network interfaces come up.
Seemingly related I am getting refcount problems when I shutdown, ie.
unregister_netdevice() sees a usage count of 1, which never decrements.

Bisect says it's ebc0ffae5 which causes the problem, or makes it appear.

    fib: RCU conversion of fib_lookup()

    fib_lookup() converted to be called in RCU protected context, no
    reference taken and released on a contended cache line (fib_clntref)

Is this a bug in that commit, or a driver bug exposed?

cheers

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