Re: (3.1.0-rc2-git7) include/linux/inetdevice.h:209 invoked rcu_dereference_check() without protection!

From: Eric Dumazet <redacted>
Date: Tue, 23 Aug 2011 07:32:42 +0200

[PATCH] arp: fix rcu lockdep splat in arp_process()

Dave Jones reported a lockdep splat triggered by an arp_process() call
from parp_redo().

Commit faa9dcf793be (arp: RCU changes) is the origin of the bug, since
it assumed arp_process() was called under rcu_read_lock(), which is not
true in this particular path.

Instead of adding rcu_read_lock() in parp_redo(), I chose to add it in 
neigh_proxy_process() to take care of IPv6 side too.

...

Reported-by: Dave Jones <redacted>
Signed-off-by: Eric Dumazet <redacted>

Applied and queued up for -stable, thanks!