[Bug #16572][REGRESSION, bisected] random panics in bridging on 2.6.34+

Hi,

I am getting random panics with KVM/bridging on 2.6.34+ (including
latest git as of this morning).

There is a screenshot of the panic message in bugzilla at
https://bugzilla.kernel.org/show_bug.cgi?id=16572

It seems to happen when I have KVM virtual machines running with
bridging mode, most often when any of the virtual machines talk to the
network, or sometimes when they are brought up or down.

I bisected it down to this commit:

commit 68b7c895be336b19f4c38d7cb500132fabba0afd
Author: Herbert Xu [off-list ref]
Date:   Sat Feb 27 19:41:40 2010 +0000

    bridge: Allow tail-call on br_pass_frame_up

    This patch allows tail-call on the call to br_pass_frame_up
    in br_handle_frame_finish.  This is now possible because of the
    previous patch to call br_pass_frame_up last.

    Signed-off-by: Herbert Xu [off-list ref]
    Signed-off-by: David S. Miller [off-list ref]