Kernel Panic when bridging two 10G x520-DAs

I have two 10G x520-DA2 nics (82599EB) running latest ixgbe driver 3.8.21 under latest centos 6.2 kernel (2.6.32-220.13.1.el6.x86_64).

Due to issues with vlan tagging over the bridged interfaces ( http://communities.intel.com/message/152866 ), I have the bridges configured as:

#: brctl show
bridge name    bridge id        STP enabled    interfaces
br0        8000.001b21d73a78    no        eth0
                                                              eth2
br253        8000.001b21d73a78    no        eth0.253
                                                                  eth2.253
br353        8000.001b21d73a78    no        eth0.353
                                                                  eth2.353
br653        8000.001b21d73a78    no        eth0.653
                                                                  eth2.653

Iptables and ip6tables are called on the bridge devices:

net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1

About 5-10 seconds after passing traffic through the br253 bridge device, the kernel panics with the following:

kernel:general protection fault: 0000 [#1] SMP
kernel:last sysfs file: /sys/devices/virtual/net/br653/bridge/multicast_startup_query_interval

kernel:Stack:

kernel:Call Trace:

kernel:Code: 5f 3a 00 48 8b 05 19 1a e6 00 48 c7 c2 f8 b2 fa 81 48 85 c0 74 26 48 8b 4b 08 48 3b 48 08 77 11 eb 1a 66 0f 1f 84 00 00 00 00 00 <48> 39 48 08 73 0b 48 89

kernel:Kernel panic - not syncing: Fatal exception

The console also has an addition line:

stack-protector: Kernel stack is corrupted in: ffffffff8148f073

Any help/pointers would be appreciated.