Patch "net: ipv6: Release route when device is unregistering" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

net: ipv6: Release route when device is unregistering

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-ipv6-release-route-when-device-is-unregistering.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: David Ahern <[email protected]>
Date: Wed, 7 Jun 2017 12:26:23 -0600
Subject: net: ipv6: Release route when device is unregistering

From: David Ahern <[email protected]>

[ Upstream commit 8397ed36b7c585f8d3e06c431f4137309124f78f ]

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.

---
 include/linux/netdevice.h |    5 +++++
 net/ipv6/route.c          |    1 +
 2 files changed, 6 insertions(+)

@@ -4232,6 +4232,11 @@ static inline const char *netdev_name(co
 	return dev->name;
 }
 
+static inline bool netdev_unregistering(const struct net_device *dev)
+{
+	return dev->reg_state == NETREG_UNREGISTERING;
+}
+
 static inline const char *netdev_reg_state(const struct net_device *dev)
 {
 	switch (dev->reg_state) {

@@ -2804,6 +2804,7 @@ static int fib6_ifdown(struct rt6_info *
 	if ((rt->dst.dev == dev || !dev) &&
 	    rt != adn->net->ipv6.ip6_null_entry &&
 	    (rt->rt6i_nsiblings == 0 ||
+	     (dev && netdev_unregistering(dev)) ||
 	     !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
 		return -1;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/net-vrf-make-add_fib_rules-per-network-namespace-flag.patch queue-4.11/net-ipv6-release-route-when-device-is-unregistering.patch