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Date: Thu, 7 Oct 2010 10:48:12 +0200
From: Hans Schillstrom <hans.schillstrom@...csson.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "Eric W. Biederman" <ebiederm@...ssion.com>,
Daniel Lezcano <daniel.lezcano@...e.fr>
Subject: BUG ? ipip unregister_netdevice_many()
Hello
I'm trying to exit a network name space and it doesn't work (or am I doing something wrong?)
The only netdevices left are lo and the tunnels ip6tnl0, sit0 and tunl0 when exiting netns.
A netns is created by lxc-execute with two interfaces eth0 eth1 (macvlan)
(see conf file at the end)
Kernel: net-next-2.6 top from 4 october 2010
I added some printk's inn ipip.c ipip_exit_net()
...
rtnl_lock();
printk(KERN_ERR "ipip_exit_net(enter)\n");
ipip_destroy_tunnels(ipn, &list);
printk(KERN_ERR "ipip_exit_net(1)\n");
unregister_netdevice_queue(ipn->fb_tunnel_dev, &list);
printk(KERN_ERR "ipip_exit_net(2)\n");
unregister_netdevice_many(&list);
printk(KERN_ERR "ipip_exit_net(3)\n");
rtnl_unlock();
printk(KERN_ERR "ipip_exit_net(exit)\n");
Exit steps:
===== Screen dump =====
# ifconfig eth0 0.0.0.0 down
# ifconfig eth1 0.0.0.0 down
# ifconfig lo 0.0.0.0 down
# ip li de eth0
# ip li de eth1
# ifconfig -a
ip6tnl0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:1460 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
LOOPBACK MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
tunl0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
# ps
PID USER VSZ STAT COMMAND
1 root 12412 S /usr/lib64/lxc/lxc-init -- /var/bin/init
2 root 4540 S /bin/ash /var/bin/init
7 root 6640 S inetd
8 root 4544 S /bin/ash
26 root 4544 R ps
# lsmod
Module Size Used by Not tainted
macvlan 8709 0
pcnet32 29549 0
tg3 112093 0
libphy 21043 1 tg3
# kill 7 2
# ps
PID USER VSZ STAT COMMAND
1 root 12412 S /usr/lib64/lxc/lxc-init -- /var/bin/init
8 root 4544 S /bin/ash
28 root 4544 R ps
# exit ( here is the exit from netns )
# ipip_exit_net(enter)
ipip_exit_net(1)
ipip_exit_net(2)
------------[ cut here ]------------
WARNING: at /home/hans/evip/kvm/net-next-2.6/kernel/sysctl.c:1953 unregister_sysctl_table+0xc7/0xf9()
Hardware name: Bochs
Modules linked in: macvlan pcnet32 tg3 libphy
Pid: 5, comm: kworker/u:0 Not tainted 2.6.36-rc3+ #7
Call Trace:
[<ffffffff8103e281>] warn_slowpath_common+0x85/0x9d
[<ffffffff8103e2b3>] warn_slowpath_null+0x1a/0x1c
[<ffffffff81045e64>] unregister_sysctl_table+0xc7/0xf9
[<ffffffff812c86a5>] neigh_sysctl_unregister+0x27/0x3f
[<ffffffff81342108>] addrconf_ifdown+0x415/0x45e
[<ffffffff81342b98>] addrconf_notify+0x756/0x7fe
[<ffffffff812cacfb>] ? neigh_ifdown+0xc3/0xd4
[<ffffffff813622b3>] ? ip6mr_device_event+0x8d/0x9e
[<ffffffff8105eddb>] notifier_call_chain+0x37/0x63
[<ffffffff8105ee8b>] raw_notifier_call_chain+0x14/0x16
[<ffffffff812c15c7>] call_netdevice_notifiers+0x4a/0x4f
[<ffffffff812c1c1b>] rollback_registered_many+0x121/0x208
[<ffffffff812c1d1d>] unregister_netdevice_many+0x1b/0x71
[<ffffffff81324209>] ipip_exit_net+0xea/0x11a
[<ffffffff812bc941>] ? cleanup_net+0x0/0x198
[<ffffffff812bc2cf>] ops_exit_list+0x2a/0x5b
[<ffffffff812bca39>] cleanup_net+0xf8/0x198
[<ffffffff810568c7>] process_one_work+0x2a2/0x44d
[<ffffffff81056e35>] worker_thread+0x1db/0x34e
[<ffffffff81056c5a>] ? worker_thread+0x0/0x34e
[<ffffffff8105a030>] kthread+0x82/0x8a
[<ffffffff81003954>] kernel_thread_helper+0x4/0x10
[<ffffffff81059fae>] ? kthread+0x0/0x8a
[<ffffffff81003950>] ? kernel_thread_helper+0x0/0x10
---[ end trace 939b5185219f32e7 ]---
ipip_exit_net(3)
ipip_exit_net(exit)
unregister_netdevice: waiting for lo to become free. Usage count = 4
unregister_netdevice: waiting for lo to become free. Usage count = 4
unregister_netdevice: waiting for lo to become free. Usage count = 4
....
...
===== End of screen dump =====
lxc conf file:
# Container with network virtualized using the vlan device driver
# Local eth0 uplink
lxc.utsname = fee_0
lxc.network.type = macvlan
lxc.network.flags = up
lxc.network.link = eth1
lxc.network.hwaddr = 00:00:04:01:01:01
lxc.network.ipv4 = 192.168.1.21/24
lxc.network.ipv6 = 2003::2:1:1/96
# local eth1 downlink - to the RS farm
lxc.network.type = macvlan
lxc.network.flags = up
lxc.network.link = eth0
lxc.network.hwaddr = 00:00:03:01:01:01
lxc.network.ipv4 = 192.168.0.21/24
lxc.network.ipv6 = 2003::1:1:1/96
lxc.mount.entry = /var/lib/lxc/fee_0/var /var none rw,bind 0 0
Regards
Hans Schillstrom <hans.schillstrom@...csson.com>
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