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Description of problem:
When there is only one bridge,create tunnel in the bridge, then delete the bridge directly. the system tunnel interface still in.

Cause of only one bridge, backer->refcount values 1, when delete bridge "close_dpif_backer" will delete the backer, so type_run will return directly, doesn't delete the interface.

How reproducible:
always

Steps to Reproduce:
1.ovs-vsctl add-br ovsbr0
2.ovs-vsctl add-port ovsbr0 vxlan0 -- set interface vxlan0 type=vxlan option:remote_ip=11.11.11.0
3.ovs-vsctl del-br ovsbr0
4.ifconfig
Actual results:
can't delete vxlan_sys_4789

Expected results:
vxlan_sys_4789 is deleted.

Additional info:

This appears after ovs 2.8.0, when create ovs tunnel with rtnetlink.

Verified this bug in ovs 2.9.0-1.el7fdp, the vxlan_sys_4789 disappeared when deleted the ovs bridge directly. The bug has been fixed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0550