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Date: Thu, 12 Dec 2019 20:12:27 +0000
From: Brandon Cazander <brandon.cazander@...tapplied.net>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: unregister_netdevice dst refcnt leak with VRF and transparent socket
I'm running into an issue where deleting a VRF interface through ip link
hangs forever, and the kernel logs this message until a reboot:
[Thu Dec 12 10:27:31 2019] unregister_netdevice: waiting for vrf-blue to
become free. Usage count = 1
I'm able to replicate it using the below script that connects to a
remote HTTP server through a VRF using a socket with IP_TRANSPARENT set.
If the connection is made non-transparently, I'm not able to replicate
the issue. This is reproducible on kernels as new as 5.3, but most of my
debugging has been on on 4.12.14-lp151.28.32-debug from openSUSE Leap.
--
#!/bin/bash -ex
# Prerequisites:
# - HTTP server listening on 192.168.122.1:80
# - Route for 192.168.0.1/32 via 192.168.122.2
ip link add vrf-blue type vrf table 10
ip link set dev vrf-blue up
ip link set dev eth1 master vrf-blue up
ip address add 192.168.122.2/24 dev eth1
ip route add default via 192.168.122.1 dev eth1 table 10
# Place outgoing marked packets into vrf-blue
ip rule add from all fwmark 0x10000/0xfff0000 lookup 10 prio 90
# Redirect incoming responses to local socket
iptables -t mangle -I PREROUTING -d 192.168.0.1/32 -p tcp -m multiport
--ports 80 -j MARK --set-xmark 0xf0/0xffffffff -m socket -i vrf-blue
ip rule add from all fwmark 0xf0 lookup 240
ip route add local default dev lo proto static scope host table 240
cat <<EOF | python3 -
import socket
import struct
SRC = '192.168.0.1'
DST = '192.168.122.1'
SO_MARK = 36
if __name__ == '__main__':
s = socket.socket()
s.setsockopt(socket.SOL_IP, socket.IP_TRANSPARENT, 1)
s.setsockopt(socket.SOL_SOCKET, SO_MARK, struct.pack('L', 0x10000 |
0x80000000))
s.bind((SRC, 58182))
s.connect((DST, 80))
s.send(f"GET / HTTP/1.1\r\nHost:{DST}\r\n\r\n".encode())
r = s.recv(4096)
print('success')
s.close()
EOF
ip link del dev vrf-blue
--
I haven't been able to exactly track down what's happening but based on
some debugging around dev_put and dev_hold I can see that the unreleased
reference to the vrf interface happens in this call trace.
netdevice: vrf-blue
dev_hold 14
------------[ cut here ]------------
Call Trace:
<IRQ>
dst_alloc+0x71/0x90
rt_dst_alloc+0x4f/0xd0
ip_route_input_noref+0x66e/0xc00
? __inet_lookup_established+0x3f/0x110
ip_rcv_finish_core.isra.15+0x66/0x380
ip_rcv_finish+0x62/0x90
ip_rcv+0xaf/0xc0
? ip_rcv_finish_core.isra.15+0x380/0x380
__netif_receive_skb_one_core+0x42/0x50
netif_receive_skb_internal+0x26/0x90
napi_gro_receive+0xca/0xf0
e1000_clean_rx_irq+0x213/0x400 [e1000e]
e1000e_poll+0x8d/0x280 [e1000e]
net_rx_action+0x139/0x3b0
? e1000_intr_msix_rx+0x52/0x70 [e1000e]
__do_softirq+0xde/0x2e2
irq_exit+0xba/0xc0
do_IRQ+0x81/0xd0
common_interrupt+0x8f/0x8f
</IRQ>
The below output shows all dev_hold and dev_put calls for the VRF
interface annotated along with the steps of the script above. As it's
easy for me to replicate the issue I can provide any troubleshooting
that might be helpful in tracking down the issue.
---------------------------------------------------------------------------
[Thu Dec 12 10:27:16 2019] Starting script
---------------------------------------------------------------------------
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 1
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] dst_alloc+0x71/0x90
[Thu Dec 12 10:27:16 2019] rt_dst_alloc+0x4f/0xd0
[Thu Dec 12 10:27:16 2019] vrf_dev_init+0x96/0x250 [vrf]
[Thu Dec 12 10:27:16 2019] register_netdevice+0xa7/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 2
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] dst_alloc+0x71/0x90
[Thu Dec 12 10:27:16 2019] rt_dst_alloc+0x4f/0xd0
[Thu Dec 12 10:27:16 2019] vrf_dev_init+0xc2/0x250 [vrf]
[Thu Dec 12 10:27:16 2019] register_netdevice+0xa7/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 3
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] dst_alloc+0x71/0x90
[Thu Dec 12 10:27:16 2019] __ip6_dst_alloc+0x1f/0x90
[Thu Dec 12 10:27:16 2019] ip6_dst_alloc+0xb/0x50
[Thu Dec 12 10:27:16 2019] vrf_dev_init+0x16d/0x250 [vrf]
[Thu Dec 12 10:27:16 2019] register_netdevice+0xa7/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 4
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] dst_alloc+0x71/0x90
[Thu Dec 12 10:27:16 2019] __ip6_dst_alloc+0x1f/0x90
[Thu Dec 12 10:27:16 2019] ip6_dst_alloc+0xb/0x50
[Thu Dec 12 10:27:16 2019] vrf_dev_init+0x198/0x250 [vrf]
[Thu Dec 12 10:27:16 2019] register_netdevice+0xa7/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 5
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] netdev_register_kobject+0xdd/0x170
[Thu Dec 12 10:27:16 2019] register_netdevice+0x2f1/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue (uninitialized)
dev_hold 6
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] netdev_register_kobject+0x140/0x170
[Thu Dec 12 10:27:16 2019] register_netdevice+0x2f1/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 7
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 8
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] inetdev_init+0x87/0x220
[Thu Dec 12 10:27:16 2019] inetdev_event+0x3c7/0x540
[Thu Dec 12 10:27:16 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] register_netdevice+0x3e8/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 9
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] inetdev_event+0x3c7/0x540
[Thu Dec 12 10:27:16 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] register_netdevice+0x3e8/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 10
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] ipv6_add_dev.part.49+0xd7/0x5d0
[Thu Dec 12 10:27:16 2019] addrconf_notify+0xe8/0xb70
[Thu Dec 12 10:27:16 2019] ? inetdev_init+0x161/0x220
[Thu Dec 12 10:27:16 2019] ? inetdev_event+0x3c7/0x540
[Thu Dec 12 10:27:16 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] register_netdevice+0x3e8/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 11
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] addrconf_notify+0xe8/0xb70
[Thu Dec 12 10:27:16 2019] ? inetdev_init+0x161/0x220
[Thu Dec 12 10:27:16 2019] ? inetdev_event+0x3c7/0x540
[Thu Dec 12 10:27:16 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:16 2019] register_netdevice+0x3e8/0x620
[Thu Dec 12 10:27:16 2019] vrf_newlink+0x47/0x130 [vrf]
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x700/0x910
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x188/0x910
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? do_filp_open+0xa0/0xf0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 12
[Thu Dec 12 10:27:16 2019] mrp
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] rt_cache_route+0x88/0xb0
[Thu Dec 12 10:27:16 2019] rt_set_nexthop.constprop.55+0x12c/0x320
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] __ip_route_output_key_hash+0x3d6/0x9d0
[Thu Dec 12 10:27:16 2019] ip_route_output_flow+0x19/0x50
[Thu Dec 12 10:27:16 2019] ip_queue_xmit+0x361/0x3e0
[Thu Dec 12 10:27:16 2019] vrf scsi_transport_iscsi
[Thu Dec 12 10:27:16 2019] __tcp_transmit_skb+0x513/0x9c0
[Thu Dec 12 10:27:16 2019] tcp_write_xmit+0x1b2/0xef0
[Thu Dec 12 10:27:16 2019] __tcp_push_pending_frames+0x31/0xd0
[Thu Dec 12 10:27:16 2019] tcp_sendmsg_locked+0x386/0xbe0
[Thu Dec 12 10:27:16 2019] iscsi_ibft
[Thu Dec 12 10:27:16 2019] iscsi_boot_sysfs
[Thu Dec 12 10:27:16 2019] tcp_sendmsg+0x27/0x40
[Thu Dec 12 10:27:16 2019] af_packet
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] sock_write_iter+0x84/0xd0
[Thu Dec 12 10:27:16 2019] __vfs_write+0xde/0x150
[Thu Dec 12 10:27:16 2019] xt_nat
[Thu Dec 12 10:27:16 2019] ip6table_nat
[Thu Dec 12 10:27:16 2019] vfs_write+0xbe/0x1b0
[Thu Dec 12 10:27:16 2019] SyS_write+0x45/0xa0
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] netdevice: vrf-blue
dev_hold 13
[Thu Dec 12 10:27:16 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:16 2019] Call Trace:
[Thu Dec 12 10:27:16 2019] __netdev_upper_dev_link+0xed/0x190
[Thu Dec 12 10:27:16 2019] ? vrf_add_slave+0x4a/0x70 [vrf]
[Thu Dec 12 10:27:16 2019] vrf_add_slave+0x4a/0x70 [vrf]
[Thu Dec 12 10:27:16 2019] do_setlink+0x341/0xd60
[Thu Dec 12 10:27:16 2019] rtnl_newlink+0x5d0/0x910
[Thu Dec 12 10:27:16 2019] ? _raw_spin_unlock+0xa/0x20
[Thu Dec 12 10:27:16 2019] ? security_capable+0x47/0x60
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:16 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:16 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:16 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:16 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:16 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:16 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:16 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:16 2019] ? __alloc_pages_nodemask+0x13e/0x2d0
[Thu Dec 12 10:27:16 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:16 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:16 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:16 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
---------------------------------------------------------------------------
[Thu Dec 12 10:27:18 2019] Setup completed
[Thu Dec 12 10:27:19 2019] Starting connection
---------------------------------------------------------------------------
[Thu Dec 12 10:27:20 2019] netdevice: vrf-blue
dev_hold 14
[Thu Dec 12 10:27:20 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:20 2019] Call Trace:
[Thu Dec 12 10:27:20 2019] <IRQ>
[Thu Dec 12 10:27:20 2019] dst_alloc+0x71/0x90
[Thu Dec 12 10:27:20 2019] rt_dst_alloc+0x4f/0xd0
[Thu Dec 12 10:27:20 2019] ip_route_input_noref+0x66e/0xc00
[Thu Dec 12 10:27:20 2019] ? __inet_lookup_established+0x3f/0x110
[Thu Dec 12 10:27:20 2019] ip_rcv_finish_core.isra.15+0x66/0x380
[Thu Dec 12 10:27:20 2019] ip_rcv_finish+0x62/0x90
[Thu Dec 12 10:27:20 2019] ip_rcv+0xaf/0xc0
[Thu Dec 12 10:27:20 2019] ? ip_rcv_finish_core.isra.15+0x380/0x380
[Thu Dec 12 10:27:20 2019] __netif_receive_skb_one_core+0x42/0x50
[Thu Dec 12 10:27:20 2019] netif_receive_skb_internal+0x26/0x90
[Thu Dec 12 10:27:20 2019] napi_gro_receive+0xca/0xf0
[Thu Dec 12 10:27:20 2019] e1000_clean_rx_irq+0x213/0x400 [e1000e]
[Thu Dec 12 10:27:20 2019] e1000e_poll+0x8d/0x280 [e1000e]
[Thu Dec 12 10:27:20 2019] net_rx_action+0x139/0x3b0
[Thu Dec 12 10:27:20 2019] ? e1000_intr_msix_rx+0x52/0x70 [e1000e]
[Thu Dec 12 10:27:20 2019] __do_softirq+0xde/0x2e2
[Thu Dec 12 10:27:20 2019] irq_exit+0xba/0xc0
[Thu Dec 12 10:27:20 2019] do_IRQ+0x81/0xd0
[Thu Dec 12 10:27:20 2019] common_interrupt+0x8f/0x8f
[Thu Dec 12 10:27:20 2019] </IRQ>
---------------------------------------------------------------------------
[Thu Dec 12 10:27:21 2019] Finished connection
[Thu Dec 12 10:27:21 2019] Deleting interface
---------------------------------------------------------------------------
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue
dev_put 13
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] __netdev_adjacent_dev_unlink_neighbour+0x19/0x30
[Thu Dec 12 10:27:21 2019] netdev_upper_dev_unlink+0x76/0xc0
[Thu Dec 12 10:27:21 2019] ? vrf_dellink+0x39/0x80 [vrf]
[Thu Dec 12 10:27:21 2019] vrf_dellink+0x39/0x80 [vrf]
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x2f/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 12
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] dev_shutdown+0xa2/0xc0
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x267/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] ? unregister_netdevice_queue+0x16/0xe0
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 11
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] inetdev_event+0x1fe/0x540
[Thu Dec 12 10:27:21 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x368/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 10
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] addrconf_ifdown+0x4f5/0x5a0
[Thu Dec 12 10:27:21 2019] addrconf_notify+0x2b8/0xb70
[Thu Dec 12 10:27:21 2019] ? _raw_spin_unlock_bh+0xa/0x20
[Thu Dec 12 10:27:21 2019] ? rt_flush_dev+0x4b/0x2b0
[Thu Dec 12 10:27:21 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x368/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 9
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] addrconf_ifdown+0x559/0x5a0
[Thu Dec 12 10:27:21 2019] addrconf_notify+0x2b8/0xb70
[Thu Dec 12 10:27:21 2019] ? _raw_spin_unlock_bh+0xa/0x20
[Thu Dec 12 10:27:21 2019] ? rt_flush_dev+0x4b/0x2b0
[Thu Dec 12 10:27:21 2019] ? notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] notifier_call_chain+0x47/0x70
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x368/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 8
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] <IRQ>
[Thu Dec 12 10:27:21 2019] ? in_dev_finish_destroy+0x140/0x140
[Thu Dec 12 10:27:21 2019] rcu_process_callbacks+0x1b2/0x830
[Thu Dec 12 10:27:21 2019] ? enqueue_hrtimer+0x37/0x90
[Thu Dec 12 10:27:21 2019] __do_softirq+0xde/0x2e2
[Thu Dec 12 10:27:21 2019] irq_exit+0xba/0xc0
[Thu Dec 12 10:27:21 2019] smp_apic_timer_interrupt+0x3f/0x60
[Thu Dec 12 10:27:21 2019] apic_timer_interrupt+0x8f/0xa0
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 3
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] kobject_put+0x86/0x1a0
[Thu Dec 12 10:27:21 2019] net_rx_queue_update_kobjects+0x19b/0x240
[Thu Dec 12 10:27:21 2019] netdev_unregister_kobject+0x4b/0x80
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x244/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 2
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] kobject_put+0x86/0x1a0
[Thu Dec 12 10:27:21 2019] netdev_queue_update_kobjects+0xc3/0x230
[Thu Dec 12 10:27:21 2019] netdev_unregister_kobject+0x58/0x80
[Thu Dec 12 10:27:21 2019] rollback_registered_many+0x244/0x5f0
[Thu Dec 12 10:27:21 2019] ? dev_change_flags+0x4b/0x60
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:21 2019] netdevice: vrf-blue (unregistering)
dev_put 1
[Thu Dec 12 10:27:21 2019] ------------[ cut here ]------------
[Thu Dec 12 10:27:21 2019] Call Trace:
[Thu Dec 12 10:27:21 2019] unregister_netdevice_many.part.117+0xe/0x90
[Thu Dec 12 10:27:21 2019] rtnl_delete_link+0x37/0x50
[Thu Dec 12 10:27:21 2019] rtnl_dellink+0xba/0x1d0
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv_msg+0x107/0x1f0
[Thu Dec 12 10:27:21 2019] ? rtnl_newlink+0x910/0x910
[Thu Dec 12 10:27:21 2019] netlink_rcv_skb+0x4d/0x130
[Thu Dec 12 10:27:21 2019] rtnetlink_rcv+0x24/0x30
[Thu Dec 12 10:27:21 2019] netlink_unicast+0x17a/0x220
[Thu Dec 12 10:27:21 2019] netlink_sendmsg+0x291/0x390
[Thu Dec 12 10:27:21 2019] sock_sendmsg+0x36/0x40
[Thu Dec 12 10:27:21 2019] ___sys_sendmsg+0x2ec/0x300
[Thu Dec 12 10:27:21 2019] ? __inode_wait_for_writeback+0x6f/0xc0
[Thu Dec 12 10:27:21 2019] ? __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] __sys_sendmsg+0x41/0x70
[Thu Dec 12 10:27:21 2019] do_syscall_64+0x7b/0x160
[Thu Dec 12 10:27:21 2019] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[Thu Dec 12 10:27:31 2019] unregister_netdevice: waiting for vrf-blue to
become free. Usage count = 1
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