[lxc-users] IPv6: Neighbour table overflow

Tamas Papp tompos at martos.bme.hu
Mon Feb 17 21:37:39 UTC 2014


hi All,

I spent the whole day with debugging a weird network issue. On our
network there were packet losses, ping timeout and everything you can image.
I was sure, there is a loop, or faulty switch, but wasn't able really
identify the root. Sometime it was better, then the packet losses came
back after a while (last time after 5 hours...).

Then I looked into syslog on one of servers and I saw many messages like
this:

[772718.275810] IPv6: Neighbour table overflow
[772718.275998] IPv6: Neighbour table overflow
[772718.276184] IPv6: Neighbour table overflow
[772718.276381] IPv6: Neighbour table overflow
[772718.276567] IPv6: Neighbour table overflow
[772718.276754] IPv6: Neighbour table overflow
[772718.276949] IPv6: Neighbour table overflow
[772718.277135] IPv6: Neighbour table overflow
[772718.277320] IPv6: Neighbour table overflow
[772718.277515] IPv6: Neighbour table overflow
[772723.305935] net_ratelimit: 4359 callbacks suppressed
[772723.305994] IPv6: Neighbour table overflow
[772723.306182] IPv6: Neighbour table overflow
[772723.306369] IPv6: Neighbour table overflow
[772723.306573] IPv6: Neighbour table overflow
[772723.306763] IPv6: Neighbour table overflow
[772723.306949] IPv6: Neighbour table overflow
[772723.307150] IPv6: Neighbour table overflow
[772723.307344] IPv6: Neighbour table overflow
[772723.307531] IPv6: Neighbour table overflow
[772723.307724] IPv6: Neighbour table overflow
[772728.393985] net_ratelimit: 6093 callbacks suppressed


# sysctl -a|grep ipv6|grep disable
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.br-eth0.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.eth0.disable_ipv6 = 1
net.ipv6.conf.eth1.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.veth1RJGRU.disable_ipv6 = 0
net.ipv6.conf.veth3A6RR9.disable_ipv6 = 0
net.ipv6.conf.veth3QPC8F.disable_ipv6 = 0
net.ipv6.conf.veth6P180G.disable_ipv6 = 0
net.ipv6.conf.veth6S5FBX.disable_ipv6 = 0
net.ipv6.conf.veth8DRC4J.disable_ipv6 = 0
net.ipv6.conf.vethCBUA3B.disable_ipv6 = 0
net.ipv6.conf.vethFM1QHC.disable_ipv6 = 0
net.ipv6.conf.vethGVVD8U.disable_ipv6 = 0
net.ipv6.conf.vethNJCGES.disable_ipv6 = 0
net.ipv6.conf.vethOGQEFH.disable_ipv6 = 0
net.ipv6.conf.vethPFHDNJ.disable_ipv6 = 0
net.ipv6.conf.vethRGJUV3.disable_ipv6 = 0
net.ipv6.conf.vethTNJSHJ.disable_ipv6 = 0
net.ipv6.conf.vethXEI0QW.disable_ipv6 = 0
net.ipv6.conf.vethXTQP9G.disable_ipv6 = 0
net.ipv6.conf.virbr0.disable_ipv6 = 1
net.ipv6.conf.vnet2.disable_ipv6 = 0
net.ipv6.conf.vnet3.disable_ipv6 = 0


(I don't remember when I set eth0 and virbr0, but probably it doesn't
count anything anyway..)


I set to 1 all of them, messages stopped, network returned to normal
state (hopefully forever).
This system is raring and:

ii  lxc                                            
1.0.0~beta2+master~20140118- amd64                        Linux
Containers userspace tools

Linux virt101 3.8.0-35-generic #50-Ubuntu SMP Tue Dec 3 01:24:59 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux

The system was running without any glitch for months.
Any idea?



OK, there is another machine, at the same time it's dmesg:


[2535609.880813] BUG: soft lockup - CPU#2 stuck for 22s! [rcuos/26:165]
[2535609.880871] Modules linked in: zram(FC) btrfs(F) ufs(F) qnx4(F)
hfsplus(F) hfs(F) minix(F) ntfs(F) msdos(F) jfs(F) xfs(F) libcrc32c(F)
reiserfs(F) ext2(F) binfmt_misc sunrpc bluetooth vhost_net vhost macvtap
macvlan ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM
iptable_mangle xt_tcpudp veth ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables bridge stp llc
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
lrw gf128mul glue_helper ablk_helper cryptd microcode sb_edac edac_core
joydev lpc_ich mei_me mei ioatdma wmi mac_hid lp parport zfs(POF)
zunicode(POF) zavl(POF) zcommon(POF) znvpair(POF) spl(OF) zlib_deflate
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor hid_generic usbhid hid raid6_pq raid1 raid0 igb multipath
isci i2c_algo_bit linear dca libsas ptp ahci libahci scsi_transport_sas
pps_core arcmsr
[2535609.880965] CPU: 2 PID: 165 Comm: rcuos/26 Tainted: PF        CIO
3.11.0-15-generic #23-Ubuntu
[2535609.880969] Hardware name: Intel Corporation S2600IP/S2600IP, BIOS
SE5C600.86B.01.03.0002.062020121504 06/20/2012
[2535609.880972] task: ffff880fe8405dc0 ti: ffff880fe8410000 task.ti:
ffff880fe8410000
[2535609.880976] RIP: 0010:[<ffffffff816e394b>]  [<ffffffff816e394b>]
__slab_free+0x101/0x364
[2535609.880985] RSP: 0018:ffff880fff643c58  EFLAGS: 00000202
[2535609.880987] RAX: 000000008020001f RBX: 0000000000000001 RCX:
ffffffff815e1c9e
[2535609.880988] RDX: 000000018020001f RSI: 000000008020001e RDI:
ffff880fff007500
[2535609.880990] RBP: ffff880fff643cf0 R08: 0000000000000000 R09:
0000000000000001
[2535609.880991] R10: ffffea0052cd8c00 R11: ffffffff815e1c9e R12:
ffff880fff643bc8
[2535609.880993] R13: ffffffff816f7f5d R14: ffff880fff643cf0 R15:
ffff8814b3633000
[2535609.880994] FS:  0000000000000000(0000) GS:ffff880fff640000(0000)
knlGS:0000000000000000
[2535609.880996] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2535609.880997] CR2: 00007fda2c411000 CR3: 0000000001c0e000 CR4:
00000000000427e0
[2535609.881001] Stack:
[2535609.881002]  ffff880fcc58cfc0 ffff881fe8709000 0000000000000000
0000001400000000
[2535609.881010]  000000005a4387b6 ffff880cd1a976d8 ffff88110074d900
000000005a4387b6
[2535609.881014]  000000018020001e ffff88110074d900 ffffffff815f79bf
ffffffff81cd6ac0
[2535609.881019] Call Trace:
[2535609.881022]  <IRQ>
[2535609.881024]  [<ffffffff815f79bf>] ? dst_alloc+0x4f/0x170
[2535609.881033]  [<ffffffff815e1c9e>] ? skb_free_head+0x1e/0x70
[2535609.881037]  [<ffffffff8118e7ad>] kfree+0xfd/0x130
[2535609.881041]  [<ffffffff815e1c9e>] skb_free_head+0x1e/0x70
[2535609.881045]  [<ffffffff815e1dc6>] skb_release_data+0xd6/0x110
[2535609.881051]  [<ffffffff8161fd18>] ? ip_error+0x68/0x170
[2535609.881054]  [<ffffffff815e1e24>] skb_release_all+0x24/0x30
[2535609.881060]  [<ffffffff815e1e82>] kfree_skb+0x32/0xa0
[2535609.881063]  [<ffffffff8161fd18>] ip_error+0x68/0x170
[2535609.881067]  [<ffffffff81624939>] ip_rcv_finish+0x79/0x320
[2535609.881070]  [<ffffffff816251f4>] ip_rcv+0x234/0x370
[2535609.881076]  [<ffffffff815f0526>] __netif_receive_skb_core+0x646/0x830
[2535609.881078]  [<ffffffff815f0728>] __netif_receive_skb+0x18/0x60
[2535609.881081]  [<ffffffff815f123d>] process_backlog+0xad/0x1a0
[2535609.881085]  [<ffffffff815f0acc>] net_rx_action+0x11c/0x240
[2535609.881093]  [<ffffffff810673c7>] __do_softirq+0xf7/0x240
[2535609.881100]  [<ffffffff816f8c1c>] call_softirq+0x1c/0x30
[2535609.881101]  <EOI>
[2535609.881103]  [<ffffffff81014bf5>] do_softirq+0x55/0x90
[2535609.881110]  [<ffffffff81066b34>] local_bh_enable+0x94/0xa0
[2535609.881116]  [<ffffffff810fdc52>] rcu_nocb_kthread+0x222/0x360
[2535609.881122]  [<ffffffff81085510>] ? wake_up_atomic_t+0x30/0x30
[2535609.881126]  [<ffffffff810fda30>] ? __call_rcu_nocb_enqueue+0xc0/0xc0
[2535609.881131]  [<ffffffff81084740>] kthread+0xc0/0xd0
[2535609.881136]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535609.881141]  [<ffffffff816f716c>] ret_from_fork+0x7c/0xb0
[2535609.881145]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535609.881146] Code: 89 44 24 18 e8 a7 ac 00 00 8b 74 24 04 44 8b 4c
24 08 48 8b 54 24 10 4c 8b 44 24 18 48 89 44 24 20 41 f6 47 0b 40 4c 8b
74 24 40 <74> 16 4c 89 e8 4c 89 f1 f0 49 0f c7 4c 24 10 0f 94 c0 84 c0 74
[2535610.284622] BUG: soft lockup - CPU#29 stuck for 23s! [rcuos/31:170]
[2535610.284682] Modules linked in: zram(FC) btrfs(F) ufs(F) qnx4(F)
hfsplus(F) hfs(F) minix(F) ntfs(F) msdos(F) jfs(F) xfs(F) libcrc32c(F)
reiserfs(F) ext2(F) binfmt_misc sunrpc bluetooth vhost_net vhost macvtap
macvlan ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM
iptable_mangle xt_tcpudp veth ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables bridge stp llc
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
lrw gf128mul glue_helper ablk_helper cryptd microcode sb_edac edac_core
joydev lpc_ich mei_me mei ioatdma wmi mac_hid lp parport zfs(POF)
zunicode(POF) zavl(POF) zcommon(POF) znvpair(POF) spl(OF) zlib_deflate
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor hid_generic usbhid hid raid6_pq raid1 raid0 igb multipath
isci i2c_algo_bit linear dca libsas ptp ahci libahci scsi_transport_sas
pps_core arcmsr
[2535610.284775] CPU: 29 PID: 170 Comm: rcuos/31 Tainted: PF        CIO
3.11.0-15-generic #23-Ubuntu
[2535610.284779] Hardware name: Intel Corporation S2600IP/S2600IP, BIOS
SE5C600.86B.01.03.0002.062020121504 06/20/2012
[2535610.284783] task: ffff880fe841ddc0 ti: ffff880fe842a000 task.ti:
ffff880fe842a000
[2535610.284785] RIP: 0010:[<ffffffff815e2088>]  [<ffffffff815e2088>]
skb_scrub_packet+0x98/0x110
[2535610.284793] RSP: 0018:ffff881ffefa3818  EFLAGS: 00000206
[2535610.284796] RAX: 0000000000000000 RBX: 0000000000000282 RCX:
0000000000000008
[2535610.284798] RDX: 00000000000005dc RSI: ffff8803deb70400 RDI:
ffff88049cc9f6d8
[2535610.284801] RBP: ffff881ffefa3820 R08: 00000000000002c0 R09:
ffff881815d37400
[2535610.284804] R10: 000000000000ffff R11: 0000000000000000 R12:
ffff881ffefa3788
[2535610.284806] R13: ffffffff816f7f5d R14: ffff881ffefa3820 R15:
ffff8803deb70400
[2535610.284809] FS:  0000000000000000(0000) GS:ffff881ffefa0000(0000)
knlGS:0000000000000000
[2535610.284810] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2535610.284811] CR2: 0000000001240000 CR3: 0000000001c0e000 CR4:
00000000000427e0
[2535610.284813] Stack:
[2535610.284816]  ffff8803deb70400 ffff881ffefa3840 ffffffff815efc07
ffff880fc5493000
[2535610.284824]  0000000000000037 ffff881ffefa3860 ffffffffa03a93d3
0000000000000037
[2535610.284829]  ffff880fc5493000 ffff881ffefa38b8 ffffffff815f2248
ffffffff815e284a
[2535610.284833] Call Trace:
[2535610.284835]  <IRQ>
[2535610.284838]  [<ffffffff815efc07>] dev_forward_skb+0x87/0xd0
[2535610.284849]  [<ffffffffa03a93d3>] veth_xmit+0x33/0x90 [veth]
[2535610.284855]  [<ffffffff815f2248>] dev_hard_start_xmit+0x318/0x560
[2535610.284858]  [<ffffffff815e284a>] ? pskb_expand_head+0x6a/0x280
[2535610.284869]  [<ffffffff8160faa6>] sch_direct_xmit+0xe6/0x1c0
[2535610.284873]  [<ffffffff815f2691>] dev_queue_xmit+0x201/0x4c0
[2535610.284882]  [<ffffffffa05fd28b>] br_dev_queue_push_xmit+0x7b/0xc0
[bridge]
[2535610.284890]  [<ffffffffa0604a06>] br_nf_dev_queue_xmit+0x26/0x90
[bridge]
[2535610.284898]  [<ffffffffa0604c33>] br_nf_post_routing+0x1c3/0x360
[bridge]
[2535610.284903]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.284909]  [<ffffffffa05fd210>] ? deliver_clone+0x50/0x50 [bridge]
[2535610.284912]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.284918]  [<ffffffffa05fd210>] ? deliver_clone+0x50/0x50 [bridge]
[2535610.284923]  [<ffffffffa05fd4d2>] br_forward_finish+0x52/0x60 [bridge]
[2535610.284929]  [<ffffffffa0604e92>] br_nf_forward_finish+0xc2/0x1a0
[bridge]
[2535610.284936]  [<ffffffffa060519b>] br_nf_forward_ip+0x22b/0x400 [bridge]
[2535610.284939]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.284944]  [<ffffffffa05fd480>] ? br_multicast_flood+0x1b0/0x1b0
[bridge]
[2535610.284947]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.284952]  [<ffffffffa05fd480>] ? br_multicast_flood+0x1b0/0x1b0
[bridge]
[2535610.284960]  [<ffffffffa05fd590>] __br_forward+0xb0/0xf0 [bridge]
[2535610.284964]  [<ffffffff815e25ed>] ? skb_clone+0x5d/0xb0
[2535610.284970]  [<ffffffffa05fd4e0>] ? br_forward_finish+0x60/0x60
[bridge]
[2535610.284976]  [<ffffffffa05fd1f3>] deliver_clone+0x33/0x50 [bridge]
[2535610.284984]  [<ffffffffa05fd7b1>] br_flood+0xc1/0x140 [bridge]
[2535610.284991]  [<ffffffffa05fd4e0>] ? br_forward_finish+0x60/0x60
[bridge]
[2535610.284997]  [<ffffffffa05fd979>] br_flood_forward+0x19/0x20 [bridge]
[2535610.285003]  [<ffffffffa05fe6e7>]
br_handle_frame_finish+0x257/0x3d0 [bridge]
[2535610.285011]  [<ffffffffa06058b7>]
br_nf_pre_routing_finish+0x197/0x3a0 [bridge]
[2535610.285017]  [<ffffffffa0605d61>] br_nf_pre_routing+0x2a1/0x660
[bridge]
[2535610.285022]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.285028]  [<ffffffffa05fe490>] ?
br_handle_local_finish+0x60/0x60 [bridge]
[2535610.285031]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.285036]  [<ffffffffa05fe490>] ?
br_handle_local_finish+0x60/0x60 [bridge]
[2535610.285043]  [<ffffffffa05fea00>] br_handle_frame+0x1a0/0x250 [bridge]
[2535610.285047]  [<ffffffff815f0132>] __netif_receive_skb_core+0x252/0x830
[2535610.285052]  [<ffffffff815f2248>] ? dev_hard_start_xmit+0x318/0x560
[2535610.285055]  [<ffffffff815f0728>] __netif_receive_skb+0x18/0x60
[2535610.285059]  [<ffffffff815f123d>] process_backlog+0xad/0x1a0
[2535610.285063]  [<ffffffff815f0acc>] net_rx_action+0x11c/0x240
[2535610.285069]  [<ffffffff810673c7>] __do_softirq+0xf7/0x240
[2535610.285077]  [<ffffffff816f8c1c>] call_softirq+0x1c/0x30
[2535610.285078]  <EOI>
[2535610.285082]  [<ffffffff81014bf5>] do_softirq+0x55/0x90
[2535610.285091]  [<ffffffff81066b34>] local_bh_enable+0x94/0xa0
[2535610.285098]  [<ffffffff810fdc52>] rcu_nocb_kthread+0x222/0x360
[2535610.285103]  [<ffffffff81085510>] ? wake_up_atomic_t+0x30/0x30
[2535610.285110]  [<ffffffff810fda30>] ? __call_rcu_nocb_enqueue+0xc0/0xc0
[2535610.285116]  [<ffffffff81084740>] kthread+0xc0/0xd0
[2535610.285121]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535610.285127]  [<ffffffff816f716c>] ret_from_fork+0x7c/0xb0
[2535610.285132]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535610.285133] Code: 48 85 ff 74 0f f0 ff 0f 0f 94 c0 84 c0 74 05 e8
af e4 09 00 48 8b bb 88 00 00 00 48 c7 43 60 00 00 00 00 48 85 ff 74 0f
f0 ff 0f <0f> 94 c0 84 c0 74 05 e8 0c c2 03 00 48 8b bb 90 00 00 00 48 c7
[2535610.308608] BUG: soft lockup - CPU#31 stuck for 23s! [rcuos/14:153]
[2535610.308662] Modules linked in: zram(FC) btrfs(F) ufs(F) qnx4(F)
hfsplus(F) hfs(F) minix(F) ntfs(F) msdos(F) jfs(F) xfs(F) libcrc32c(F)
reiserfs(F) ext2(F) binfmt_misc sunrpc bluetooth vhost_net vhost macvtap
macvlan ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM
iptable_mangle xt_tcpudp veth ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables bridge stp llc
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
lrw gf128mul glue_helper ablk_helper cryptd microcode sb_edac edac_core
joydev lpc_ich mei_me mei ioatdma wmi mac_hid lp parport zfs(POF)
zunicode(POF) zavl(POF) zcommon(POF) znvpair(POF) spl(OF) zlib_deflate
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor hid_generic usbhid hid raid6_pq raid1 raid0 igb multipath
isci i2c_algo_bit linear dca libsas ptp ahci libahci scsi_transport_sas
pps_core arcmsr
[2535610.308732] CPU: 31 PID: 153 Comm: rcuos/14 Tainted: PF        CIO
3.11.0-15-generic #23-Ubuntu
[2535610.308734] Hardware name: Intel Corporation S2600IP/S2600IP, BIOS
SE5C600.86B.01.03.0002.062020121504 06/20/2012
[2535610.308736] task: ffff880fe8bcaee0 ti: ffff880fe8bc6000 task.ti:
ffff880fe8bc6000
[2535610.308737] RIP: 0010:[<ffffffffa0392d64>]  [<ffffffffa0392d64>]
ipt_do_table+0x154/0x6aa [ip_tables]
[2535610.308744] RSP: 0018:ffff881ffefe38e8  EFLAGS: 00000246
[2535610.308745] RAX: 0000000000000098 RBX: ffff881ffefe38b8 RCX:
0000000000000006
[2535610.308747] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
00305806075f1b01
[2535610.308748] RBP: ffff881ffefe39f8 R08: ffff880fe31e5780 R09:
ffff881e83f8ef00
[2535610.308749] R10: ffff8812724d41a0 R11: ffff880fe6db0000 R12:
ffff881ffefe3858
[2535610.308751] R13: ffffffff816f7f5d R14: ffff881ffefe39f8 R15:
ffff881d0823a648
[2535610.308753] FS:  0000000000000000(0000) GS:ffff881ffefe0000(0000)
knlGS:0000000000000000
[2535610.308754] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2535610.308756] CR2: 00007fda2c411000 CR3: 0000000001c0e000 CR4:
00000000000427e0
[2535610.308757] Stack:
[2535610.308758]  ffff880fc65c1000 0000000000000246 ffff881ffefe3948
ffffffff815f26ca
[2535610.308763]  0000000000000000 0000000000000002 ffff8810f2249008
ffff881fe57b82d0
[2535610.308767]  ffff8810f2249000 ffff8812724d4000 ffff881fe523e870
0000000000000002
[2535610.308771] Call Trace:
[2535610.308772]  <IRQ>
[2535610.308774]  [<ffffffff815f26ca>] ? dev_queue_xmit+0x23a/0x4c0
[2535610.308782]  [<ffffffffa0381033>] iptable_filter_hook+0x33/0x70
[iptable_filter]
[2535610.308785]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.308792]  [<ffffffffa0604dd0>] ? br_nf_post_routing+0x360/0x360
[bridge]
[2535610.308797]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.308805]  [<ffffffffa0604dd0>] ? br_nf_post_routing+0x360/0x360
[bridge]
[2535610.308811]  [<ffffffffa06052b1>] br_nf_forward_ip+0x341/0x400 [bridge]
[2535610.308815]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.308820]  [<ffffffffa05fd480>] ? br_multicast_flood+0x1b0/0x1b0
[bridge]
[2535610.308823]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.308829]  [<ffffffffa05fd480>] ? br_multicast_flood+0x1b0/0x1b0
[bridge]
[2535610.308837]  [<ffffffffa05fd590>] __br_forward+0xb0/0xf0 [bridge]
[2535610.308841]  [<ffffffff815e25ed>] ? skb_clone+0x5d/0xb0
[2535610.308849]  [<ffffffffa05fd4e0>] ? br_forward_finish+0x60/0x60
[bridge]
[2535610.308854]  [<ffffffffa05fd1f3>] deliver_clone+0x33/0x50 [bridge]
[2535610.308860]  [<ffffffffa05fd7b1>] br_flood+0xc1/0x140 [bridge]
[2535610.308864]  [<ffffffffa05fd4e0>] ? br_forward_finish+0x60/0x60
[bridge]
[2535610.308870]  [<ffffffffa05fd979>] br_flood_forward+0x19/0x20 [bridge]
[2535610.308874]  [<ffffffffa05fe6e7>]
br_handle_frame_finish+0x257/0x3d0 [bridge]
[2535610.308880]  [<ffffffffa06058b7>]
br_nf_pre_routing_finish+0x197/0x3a0 [bridge]
[2535610.308885]  [<ffffffffa0605d61>] br_nf_pre_routing+0x2a1/0x660
[bridge]
[2535610.308888]  [<ffffffff8161e3bb>] nf_iterate+0x8b/0xa0
[2535610.308895]  [<ffffffffa05fe490>] ?
br_handle_local_finish+0x60/0x60 [bridge]
[2535610.308898]  [<ffffffff8161e444>] nf_hook_slow+0x74/0x130
[2535610.308904]  [<ffffffffa05fe490>] ?
br_handle_local_finish+0x60/0x60 [bridge]
[2535610.308909]  [<ffffffffa05fea00>] br_handle_frame+0x1a0/0x250 [bridge]
[2535610.308912]  [<ffffffff815f0132>] __netif_receive_skb_core+0x252/0x830
[2535610.308915]  [<ffffffff815f0728>] __netif_receive_skb+0x18/0x60
[2535610.308918]  [<ffffffff815f123d>] process_backlog+0xad/0x1a0
[2535610.308921]  [<ffffffff815f0acc>] net_rx_action+0x11c/0x240
[2535610.308925]  [<ffffffff810673c7>] __do_softirq+0xf7/0x240
[2535610.308929]  [<ffffffff816f8c1c>] call_softirq+0x1c/0x30
[2535610.308931]  <EOI>
[2535610.308933]  [<ffffffff81014bf5>] do_softirq+0x55/0x90
[2535610.308939]  [<ffffffff81066b34>] local_bh_enable+0x94/0xa0
[2535610.308945]  [<ffffffff810fdc52>] rcu_nocb_kthread+0x222/0x360
[2535610.308948]  [<ffffffff81085510>] ? wake_up_atomic_t+0x30/0x30
[2535610.308954]  [<ffffffff810fda30>] ? __call_rcu_nocb_enqueue+0xc0/0xc0
[2535610.308959]  [<ffffffff81084740>] kthread+0xc0/0xd0
[2535610.308963]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535610.308968]  [<ffffffff816f716c>] ret_from_fork+0x7c/0xb0
[2535610.308972]  [<ffffffff81084680>] ? kthread_create_on_node+0x120/0x120
[2535610.308977] Code: 48 01 f3 f6 05 1f 24 00 00 04 0f 85 7a 04 00 00
49 8d 45 30 c7 45 9c 00 00 00 00 4d 89 f5 48 89 85 70 ff ff ff 66 90 0f
b6 53 53 <41> 8b 44 24 0c 23 43 08 8b 75 c8 3b 03 41 0f b6 4c 24 09 89 d0


This one is Saucy, up for 30 days, and:
ii  lxc                                            
1.0.0~alpha3+master~20131210 amd64                        Linux
Containers userspace tools


OK, I guess it doesn't honor this kind of flood or anything..... but
there are similar machines with no messages like this. Doesn't make
sense to me.
There were only small number of this one:

br-eth0: received packet on eth0 with own address as source address



I'm out of ideas, what's happening...

t


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