Invalid Argument when adding a bond to a bridge

 Hi All,

 I need some help figuring this one out... Whenever I try to add a bond 
 to a
 bridge, I get back an invalid argument error. I've confirmed this on
 3.2-rc6, 3.1.5, 3.0.13, and 2.6.39.4 (haven't checked earlier kernels).

 Here's my setup: 32bit KVM virtual machine with no network cards (... 
 -net
 none ... ).

 I created the bond with: echo "+x" > /sys/class/net/bonding_masters

 I created the bridge with: brctl addbr b

 I try to add the bond to the bridge with: brctl addif b x

-- 
 Thanks,
 Dyweni