When i want to delete my test bridge, using:
ifconfig eth0 down
ifconfig eth1 down
ifconfig br0 down
brctl delif br0 eth0
brctl delif br0 eth1
brctl delbr br0


i get this error message from the kernel on the console:
unregister_netdevice: waiting for br0 to become free. Usage count = 2
The brctl user-level command is blocked.

Could you explain me what could likely be the cause of this error?

Thanks in advance,
#Louis.