2.6.7 snmp: Bridge does not support ioctl 0x8947

Every time I run mrtg (which uses snmp), I see al lot of these messages in my kernel logs (running kernel 2.6.7)

Jun 18 20:19:28 localhost Bridge does not support ioctl 0x8947

This didn't happen under 2.6.6. I tried upgrading net-snmp to version 5.1.1, but that didn't help. Everything seems to work ok, though, including snmp.

Cheers,
Michael