[ 2171.630710][ T3976] br0: port 1(dummy0) entered blocking state
[ 2171.631053][ T3976] br0: port 1(dummy0) entered disabled state
[ 2171.631389][ T3976] dummy0: entered allmulticast mode
[ 2171.632457][ T3976] dummy0: entered promiscuous mode
[ 2171.672861][ T3977] br0: port 1(dummy0) entered blocking state
[ 2171.673244][ T3977] br0: port 1(dummy0) entered forwarding state
[ 2174.201696][   T12] dummy0: left allmulticast mode
[ 2174.202584][   T12] dummy0: left promiscuous mode
[ 2174.203121][   T12] br0: port 1(dummy0) entered disabled state