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David Ahern
authored
Roopa reported attempts to delete a bond device that is referenced in a
multipath route is hanging:
$ ifdown bond2 # ifupdown2 command that deletes virtual devices
unregister_netdevice: waiting for bond2 to become free. Usage count = 2
Steps to reproduce:
echo 1 > /proc/sys/net/ipv6/conf/all/ignore_routes_with_linkdown
ip link add dev bond12 type bond
ip link add dev bond13 type bond
ip addr add 2001:db8:2::0/64 dev bond12
ip addr add 2001:db8:3::0/64 dev bond13
ip route add 2001:db8:33::0/64 nexthop via 2001:db8:2::2 nexthop via 2001:db8:3::2
ip link del dev bond12
ip link del dev bond13
The root cause is the recent change to keep routes on a linkdown. Update
the check to detect when the device is unregistering and release the
route for that case.
Fixes: a1a22c12 ("net: ipv6: Keep nexthop of multipath route on admin down")
Reported-by: 
Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>