On Mon, Jan 29, 2018 at 05:55:45PM +0200, Tommi Rantala wrote: > Hi, > > When running sctp_test from lksctp-tools in netns in 4.4 and 4.9 with > suitable arguments, the local loopback device in the netns is not getting > destroyed after deleting the netns. > > For example: > > ip netns add TEST > ip netns exec TEST ip link set lo up > ip link add dummy0 type dummy > ip link add dummy1 type dummy > ip link add dummy2 type dummy > ip link set dev dummy0 netns TEST > ip link set dev dummy1 netns TEST > ip link set dev dummy2 netns TEST > ip netns exec TEST ip addr add 192.168.1.1/24 dev dummy0 > ip netns exec TEST ip link set dummy0 up > ip netns exec TEST ip addr add 192.168.1.2/24 dev dummy1 > ip netns exec TEST ip link set dummy1 up > ip netns exec TEST ip addr add 192.168.1.3/24 dev dummy2 > ip netns exec TEST ip link set dummy2 up > ip netns exec TEST sctp_test -H 192.168.1.2 -P 20002 -h 192.168.1.1 -p 20000 > -s -B 192.168.1.3 > ip netns del TEST > > Results to: > > [ 354.179591] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > [ 364.419674] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > [ 374.663664] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > [ 384.903717] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > [ 395.143724] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > [ 405.383645] unregister_netdevice: waiting for lo to become free. Usage > count = 1 > ... > > Based on a quick test, 4.14 and 4.15 does not suffer from this, but its > reproducible e.g. in 4.4.113 and 4.9.75 > > Any ideas? > > Tommi > Does the problem occur if you don't set lo up? Neil -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
