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Date: Mon, 12 Apr 2010 02:36:25 +0300
From: Denys Fedorysychenko <nuclearcat@...learcat.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: netdev@...r.kernel.org, Krishna Kumar <krkumar2@...ibm.com>,
David Miller <davem@...emloft.net>
Subject: Re: NULL pointer dereference panic in stable (2.6.33.2), amd64
On Monday 12 April 2010 02:11:23 Eric Dumazet wrote:
> Le lundi 12 avril 2010 à 02:04 +0300, Denys Fedorysychenko a écrit :
> > > It is IMHO not safe, because route for this socket might have just
> > > changed and we are transmitting an old packet (queued some milli
> > > seconds before, when route was different).
> > >
> > > We then memorize a queue_index that might be too big for the new device
> > > of new selected route.
> > >
> > > Next packet we want to transmit will take the cached value of
> > > queue_index, correct for old device, maybe not correct for new device.
> >
> > Yes, it is possible, i have there RIP with 1k+ routes, changing non-stop.
> >
> > > You could try to revert commit a4ee3ce3293dc931fab19beb472a8bde1295aebe
> > >
> > > commit a4ee3ce3293dc931fab19beb472a8bde1295aebe
> >
> > I will try to revert it now. But to trigger bug probably i need 1-2 days.
>
> I can try to reproduce bug here, with a multiqueue device, a non
> multiqueue device, and changing routes while transmitting bulk of
> packets, and of course some trafic shaping to slow down xmits.
>
> Could you send :
>
> ifconfig -a
> lspci
A bit more even, hopefully it is useful.
Additional note - i have few blackhole routes, so if specific route announce
will disappear - it will be less specific blackhole route.
I have also some source routing (ip rule).
lspci
00:00.0 Host bridge: Intel Corporation 5000P Chipset Memory Controller Hub
(rev b1)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port
2 (rev b1)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port
3 (rev b1)
00:04.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port
4-5 (rev b1)
00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port
5 (rev b1)
00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port
6-7 (rev b1)
00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port
7 (rev b1)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev
b1)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev
b1)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev
b1)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers
(rev b1)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers
(rev b1)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev
b1)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev
b1)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI Express
Root Port 1 (rev 09)
00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #1 (rev 09)
00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #2 (rev 09)
00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #3 (rev 09)
00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI
USB Controller #4 (rev 09)
00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI
USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC
Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev
09)
00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB SATA AHCI
Controller (rev 09)
00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus Controller
(rev 09)
01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream
Port (rev 01)
01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X
Bridge (rev 01)
02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream
Port E1 (rev 01)
02:02.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream
Port E3 (rev 01)
04:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet
Controller (Copper) (rev 01)
04:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet
Controller (Copper) (rev 01)
07:00.0 RAID bus controller: Adaptec AAC-RAID (rev 09)
0b:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet
Controller (rev 06)
0b:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet
Controller (rev 06)
0c:05.0 VGA compatible controller: ASPEED Technology, Inc. AST2000
eth0 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:194.146.153.17 Bcast:0.0.0.0 Mask:255.255.255.224
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1047262147 errors:0 dropped:0 overruns:0 frame:0
TX packets:1017399476 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:698944316059 (650.9 GiB) TX bytes:694648889407 (646.9 GiB)
Memory:fc6e0000-fc700000
eth0.165 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:172.30.1.2 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5375126 errors:0 dropped:0 overruns:0 frame:0
TX packets:3446299 errors:0 dropped:2 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1910233297 (1.7 GiB) TX bytes:814740452 (776.9 MiB)
eth0.32 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:10.22.22.2 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:96167917 errors:0 dropped:0 overruns:0 frame:0
TX packets:166845841 errors:0 dropped:2 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:14589314556 (13.5 GiB) TX bytes:126771970521 (118.0 GiB)
eth0.33 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:10.152.152.2 Bcast:0.0.0.0 Mask:255.255.255.248
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10171808 errors:0 dropped:0 overruns:0 frame:0
TX packets:130698572 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2690522850 (2.5 GiB) TX bytes:25223310290 (23.4 GiB)
eth0.34 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:10.25.25.1 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:133415723 errors:0 dropped:0 overruns:0 frame:0
TX packets:1352 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:140007983122 (130.3 GiB) TX bytes:117870 (115.1 KiB)
eth0.35 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
UP BROADCAST RUNNING MULTICAST MTU:1500 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)
eth0.36 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1474 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:125741 (122.7 KiB) TX bytes:0 (0.0 B)
eth0.38 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:10.0.4.1 Bcast:0.0.0.0 Mask:255.255.255.248
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:674 errors:0 dropped:0 overruns:0 frame:0
TX packets:188760217 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:31004 (30.2 KiB) TX bytes:212060676669 (197.4 GiB)
eth0.39 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:10.22.24.1 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:270892875 errors:0 dropped:0 overruns:0 frame:0
TX packets:309713487 errors:0 dropped:3 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:77224626928 (71.9 GiB) TX bytes:215883462565 (201.0 GiB)
eth0.40 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:62.84.94.13 Bcast:0.0.0.0 Mask:255.255.255.248
BROADCAST MULTICAST MTU:1500 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)
eth0.41 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CC
inet addr:2.2.3.1 Bcast:0.0.0.0 Mask:255.255.255.128
BROADCAST MULTICAST MTU:1500 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)
eth1 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CD
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:949912 errors:0 dropped:0 overruns:0 frame:0
TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:429565276 (409.6 MiB) TX bytes:8064 (7.8 KiB)
Memory:fc6c0000-fc6e0000
eth1.2 Link encap:Ethernet HWaddr 00:1C:C0:19:23:80
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5462 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:273100 (266.6 KiB) TX bytes:0 (0.0 B)
eth1.3 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CD
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5462 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:273100 (266.6 KiB) TX bytes:0 (0.0 B)
eth1.4 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CD
inet addr:10.154.154.2 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5461 errors:0 dropped:0 overruns:0 frame:0
TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:273050 (266.6 KiB) TX bytes:8064 (7.8 KiB)
eth2 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CE
BROADCAST MULTICAST MTU:1500 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:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Memory:fcde0000-fce00000
eth3 Link encap:Ethernet HWaddr 00:1E:68:57:4B:CF
BROADCAST MULTICAST MTU:1500 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:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Memory:fcd80000-fcda0000
ifb0 Link encap:Ethernet HWaddr 6A:73:52:ED:4A:D6
UP BROADCAST RUNNING NOARP MTU:1500 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:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb1 Link encap:Ethernet HWaddr C2:97:7A:32:8B:59
UP BROADCAST RUNNING NOARP MTU:1500 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:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb2 Link encap:Ethernet HWaddr 96:AC:DD:0D:68:B0
UP BROADCAST RUNNING NOARP MTU:1500 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:32
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
ifb3 Link encap:Ethernet HWaddr FA:D9:59:C6:16:E7
UP BROADCAST RUNNING NOARP MTU:1500 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:32
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
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3192 errors:0 dropped:0 overruns:0 frame:0
TX packets:3192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:222919 (217.6 KiB) TX bytes:222919 (217.6 KiB)
tunx0 Link encap:UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:1.1.1.2 P-t-P:1.1.1.2 Mask:255.255.255.255
UP POINTOPOINT RUNNING MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:12531732 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1024
RX bytes:0 (0.0 B) TX bytes:1888404300 (1.7 GiB)
Router-Dora ~ # tc -d qdisc
qdisc hfsc 1: dev eth0 root refcnt 2
qdisc bfifo 101: dev eth0 parent 1:101 limit 12500000b
qdisc bfifo 111: dev eth0 parent 1:111 limit 3125Kb
qdisc bfifo 112: dev eth0 parent 1:112 limit 3125Kb
qdisc pfifo_fast 0: dev eth1 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
qdisc hfsc 1: dev eth0.33 root refcnt 2
linklayer ethernet overhead 4 mpu 64 mtu 1500 tsize 1436
qdisc bfifo 110: dev eth0.33 parent 1:110 limit 3000000b
qdisc bfifo 120: dev eth0.33 parent 1:120 limit 100000b
qdisc bfifo 130: dev eth0.33 parent 1:130 limit 100000b
qdisc bfifo 140: dev eth0.33 parent 1:140 limit 100000b
qdisc bfifo 150: dev eth0.33 parent 1:150 limit 1000000b
qdisc bfifo 160: dev eth0.33 parent 1:160 limit 100000b
qdisc bfifo 170: dev eth0.33 parent 1:170 limit 100000b
qdisc bfifo 180: dev eth0.33 parent 1:180 limit 100000b
qdisc bfifo 190: dev eth0.33 parent 1:190 limit 100000b
qdisc hfsc 1: dev eth0.38 root refcnt 2
linklayer ethernet overhead 4 mpu 64 mtu 2047 tsize 512
qdisc bfifo 3: dev eth0.38 parent 1:3 limit 5000000b
qdisc bfifo 4: dev eth0.38 parent 1:4 limit 5000000b
qdisc hfsc 1: dev eth0.39 root refcnt 2
linklayer ethernet overhead 4 mpu 64 mtu 2047 tsize 512
qdisc bfifo 3: dev eth0.39 parent 1:3 limit 3000000b
qdisc bfifo 20: dev eth0.39 parent 1:20 limit 20000000b
qdisc bfifo 31: dev eth0.39 parent 1:31 limit 1000000b
qdisc bfifo 30: dev eth0.39 parent 1:30 limit 5000000b
qdisc ingress ffff: dev eth1.3 parent ffff:fff1 ----------------
qdisc pfifo_fast 0: dev ifb0 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
qdisc pfifo_fast 0: dev ifb1 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
qdisc pfifo_fast 0: dev ifb2 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
qdisc pfifo_fast 0: dev ifb3 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
qdisc pfifo_fast 0: dev tunx0 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1
1 1 1 1 1 1 1
Router-Dora ~ # ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hfsc state UP qlen
1000
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP qlen 1000
link/ether 00:1e:68:57:4b:cd brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:1e:68:57:4b:ce brd ff:ff:ff:ff:ff:ff
5: eth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:1e:68:57:4b:cf brd ff:ff:ff:ff:ff:ff
6: eth0.32@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
7: eth0.33@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hfsc state
UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
8: eth0.34@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
9: eth0.35@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
10: eth0.36@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
11: eth0.38@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hfsc state
UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
12: eth0.39@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hfsc state
UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
13: eth0.40@...0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
14: eth0.41@...0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
15: eth0.165@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cc brd ff:ff:ff:ff:ff:ff
16: eth1.2@...1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1c:c0:19:23:80 brd ff:ff:ff:ff:ff:ff
17: eth1.3@...1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cd brd ff:ff:ff:ff:ff:ff
18: eth1.4@...1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether 00:1e:68:57:4b:cd brd ff:ff:ff:ff:ff:ff
19: ifb0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 32
link/ether 6a:73:52:ed:4a:d6 brd ff:ff:ff:ff:ff:ff
20: ifb1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 32
link/ether c2:97:7a:32:8b:59 brd ff:ff:ff:ff:ff:ff
21: ifb2: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 32
link/ether 96:ac:dd:0d:68:b0 brd ff:ff:ff:ff:ff:ff
22: ifb3: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state
UNKNOWN qlen 32
link/ether fa:d9:59:c6:16:e7 brd ff:ff:ff:ff:ff:ff
23: tunx0: <POINTOPOINT,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN
qlen 1024
link/[65534]
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