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[Xen-bugs] [Bug 173] Networking broken on DomU on an FC3 box

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To: xen-bugs@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-bugs] [Bug 173] Networking broken on DomU on an FC3 box
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Thu, 18 Aug 2005 23:42:38 +0000
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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=173





------- Additional Comments From niv@xxxxxxxxxx  2005-08-18 23:42 -------
On dom0:

[root@dom0 log]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:0D:60:F0:C5:C8
          inet addr:9.53.94.169  Bcast:9.53.94.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:368 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:27917 (27.2 KiB)  TX bytes:8232 (8.0 KiB)

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:26 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2036 (1.9 KiB)  TX bytes:2036 (1.9 KiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:1276 errors:0 dropped:0 overruns:0 frame:0
          TX packets:416 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:122687 (119.8 KiB)  TX bytes:93198 (91.0 KiB)
          Base address:0x2000 Memory:e8100000-e8120000

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:28 errors:0 dropped:0 overruns:0 frame:0
          TX packets:368 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8232 (8.0 KiB)  TX bytes:27917 (27.2 KiB)

xen-br0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:326 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:19022 (18.5 KiB)  TX bytes:0 (0.0 b)

[root@dom0 log]# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
9.53.94.0       0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         9.53.94.1       0.0.0.0         UG        0 0          0 eth0

[root@dom0 log]# brctl show
bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.feffffffffff       no              peth0
                                                        vif0.0
[root@dom0 log]# xm list
Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)
Domain-0           0      245    0      1   r----     19.2
Sles9-SP1          1      127    1      1   -b---     14.4


[root@dom0 log]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0D:60:F0:C5:C8
          inet addr:9.53.94.169  Bcast:9.53.94.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:44685 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4000 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3495812 (3.3 MiB)  TX bytes:869022 (848.6 KiB)

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:26 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2036 (1.9 KiB)  TX bytes:2036 (1.9 KiB)

peth0     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:45615 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4838 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3775256 (3.6 MiB)  TX bytes:1018876 (994.9 KiB)
          Base address:0x2000 Memory:e8100000-e8120000

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4000 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44685 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:869022 (848.6 KiB)  TX bytes:3495812 (3.3 MiB)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:493 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38691 errors:0 dropped:73 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:49986 (48.8 KiB)  TX bytes:2844407 (2.7 MiB)

xen-br0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:39307 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:2334047 (2.2 MiB)  TX bytes:0 (0.0 b)

-----------on domU guest -------------
dbarrera:~ # ifconfig -a
eth0      Link encap:Ethernet  HWaddr AA:00:00:3C:EF:50
          inet addr:9.53.94.114  Bcast:9.53.94.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1493 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:108761 (106.2 Kb)  TX bytes:840 (840.0 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:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1705 (1.6 Kb)  TX bytes:1705 (1.6 Kb)

dbarrera:~ # netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
9.53.94.0       0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
0.0.0.0         9.53.94.1       0.0.0.0         UG        0 0          0 eth0

Pinging dom0 from domU works:

dbarrera:~ # ping 9.53.94.169
PING 9.53.94.169 (9.53.94.169) 56(84) bytes of data.
64 bytes from 9.53.94.169: icmp_seq=1 ttl=64 time=7.34 ms
64 bytes from 9.53.94.169: icmp_seq=2 ttl=64 time=0.070 ms
64 bytes from 9.53.94.169: icmp_seq=3 ttl=64 time=0.073 ms
64 bytes from 9.53.94.169: icmp_seq=4 ttl=64 time=0.072 ms

--- 9.53.94.169 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3017ms
rtt min/avg/max/mdev = 0.070/1.891/7.349/3.151 ms

Pinging remote host from domU fails:

dbarrera:~ # ping 9.47.22.86
PING 9.47.22.86 (9.47.22.86) 56(84) bytes of data.

--- 9.47.22.86 ping statistics ---
268 packets transmitted, 0 received, 100% packet loss, time 267012ms

domU bumps up packets sent count, packets at least leave domU
(also confirmed by tcpdump).

dbarrera:~ # ifconfig
eth0      Link encap:Ethernet  HWaddr AA:00:00:3C:EF:50
          inet addr:9.53.94.114  Bcast:9.53.94.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2908 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:213976 (208.9 Kb)  TX bytes:1316 (1.2 Kb)

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:30 errors:0 dropped:0 overruns:0 frame:0
          TX packets:30 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2758 (2.6 Kb)  TX bytes:2758 (2.6 Kb)

In /var/log/messages on dom0:

Aug 18 15:49:35 dom0 wait_for_sysfs[4822]: either wait_for_sysfs (udev 039)
needs an update to handle the device '/class/net/xen-br0' properly (no device
symlink) or the sysfs-support of your device's driver needs to be fixed, please
report to <linux-hotplug-devel@xxxxxxxxxxxxxxxxxxxxx>
...
Aug 18 15:52:11 dom0 wait_for_sysfs[5042]: either wait_for_sysfs (udev 039)
needs an update to handle the device '/class/net/vif1.0' properly (no device
symlink) or the sysfs-support of your device's driver needs to be fixed, please
report to <linux-hotplug-devel@xxxxxxxxxxxxxxxxxxxxx>

No seemingly related or interesting messages in xend.log, xend-debug.log.

Pings from remote host posted above. The interesting thing is that it's
always the same byte (buffer overflow or underflow?).








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