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Find the offending MAC address for bpduguard

I have a Cisco WS-C6509-E with IOS, connected to a hypervisor with multiple VMs on it.

 

The port on the 6500 that connects to the hypervisor is a trunk port and has bpduguard enabled.

 

One of the VMs is causing the port to go into err-disable state by send bpdus. I am trying to figure out which, from the Cisco itself. Specifically I'm trying to find that VMs MAC address.

 

Is this possible? I have looked at debugging with full spanning-tree debugging on but all i get is that the port goes into err-disable. It doesn't tell me what the offending MAC address is (or anything about the BPDU).

 

Short of stripping VLANs from the trunk until I have the culprit network (which won't actually give me the culprit device but rather, only its VLAN), I'm not sure if there is a direct command or debug to give me this information directly. Can anyone help?

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