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Subject[62/82] ipv6: fix refcnt problem related to POSTDAD state
2.6.35-stable review patch.  If anyone has any objections, please let us know.


From: Ursula Braun <>

[ Upstream commit 801715f95be37b865af83b9909ad93da141a9306 ]

After running this bonding setup script
modprobe bonding miimon=100 mode=0 max_bonds=1
ifconfig bond0
ifenslave bond0 eth1
ifenslave bond0 eth3
on s390 with qeth-driven slaves, modprobe -r fails with this message
unregister_netdevice: waiting for bond0 to become free. Usage count = 1
due to twice detection of duplicate address.
Problem is caused by a missing decrease of ifp->refcnt in addrconf_dad_failure.
An extra call of in6_ifa_put(ifp) solves it.
Problem has been introduced with commit f2344a131bccdbfc5338e17fa71a807dee7944fa.

Signed-off-by: Ursula Braun <>
Cc: David S. Miller <>
Cc: Herbert Xu <>
Acked-by: Herbert Xu <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
net/ipv6/addrconf.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1424,8 +1424,10 @@ void addrconf_dad_failure(struct inet6_i
struct inet6_dev *idev = ifp->idev;

- if (addrconf_dad_end(ifp))
+ if (addrconf_dad_end(ifp)) {
+ in6_ifa_put(ifp);
+ }

if (net_ratelimit())
printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",

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