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Re: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)

from [François Delpierre] [Permanent Link][Original]
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)
From: François Delpierre <francois.delpierre@xxxxxxxxxx>
Date: Thu, 23 Jul 2009 23:48:12 +0200 (CEST)
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Just replying to myself.

It really looks like I found a bug about the xstransact.Read(statusPath) function that is called from
/usr/local/lib/python2.6/dist-packages/xen/xend/server/DevController.py at line 631.

xstransact.Read(statusPath) is returning None, so the return of the function is 1 and it blocks the startup of the domU.
I just added these lines to the file  :

--- /usr/src/xen-3.4-testing.hg/tools/python/build/lib.linux-x86_64-2.6/xen/xend/server/DevController.py        2009-07-16 21:40:55.000000000 +0200
+++ /usr/local/lib/python2.6/dist-packages/xen/xend/server/DevController.py     2009-07-22 20:03:00.000000000 +0200
@@ -629,7 +629,14 @@
     log.debug("hotplugStatusCallback %s.", statusPath)

     status = xstransact.Read(statusPath)
+
+    log.debug("Status : %s.", status)
+    log.debug("FDE: overriding the status variable if set to None.")

+    if status is None:
+        status = "SomethingDifferent"
+        log.debug("Status : %s.", status)
+
     if status is not None:
         if status == HOTPLUG_STATUS_ERROR:
             result['status'] = Error



and restarted xend... I know this is really a shitty patch, but at least now my DomU are starting and working wirh network enabled. The problem is that I don't know which test I disabled and I really need a developper with more experience to help pointing the problem.

Regards,

François.



----- Original Message -----
From: "François Delpierre" <francois.delpierre@xxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Wednesday, 22 July, 2009 19:43:45 GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)

Maybe here is an interesting part :

The script is just waiting at :
[2009-07-22 19:30:22 4325] DEBUG (DevController:139) Waiting for devices vif.
[2009-07-22 19:30:22 4325] DEBUG (XendDomainInfo:1709) XendDomainInfo.handleShutdownWatch
[2009-07-22 19:30:22 4325] DEBUG (DevController:144) Waiting for 0.
[2009-07-22 19:30:22 4325] DEBUG (DevController:629) hotplugStatusCallback /local/domain/0/backend/vif/5/0/hotplug-status.

If I look closer into /usr/local/lib/python2.6/dist-packages/xen/xend/server/DevController.py after line 629, there is a call to xstransact.Read(statusPath) that never answers.

François.



----- Original Message -----
From: xensource@xxxxxxxxxx
To: xen-users@xxxxxxxxxxxxxxxxxx
Sent: Wednesday, 22 July, 2009 19:08:03 GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)

Well, I had exactly the same problem by configuring the bridge with the provided network-bridge script or externally through the ubuntu /etc/network/interfaces parameters, and with both eth0 and xenbr0 default bridge interface name.
I just reverted back to eth0 as default bridge name, and network-bridge script executing at the xend init script. So, after a fresh reboot I have only eth0 up with the dhcp configured address.

After starting /etc/init.d/xend, everything is OK, and the bridge is correctly configured :
root@UbuntuTST-Blade:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:21:5e:96:07:94
          inet addr:172.17.4.46  Bcast:172.17.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:73 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4552 (4.5 KB)  TX bytes:3358 (3.3 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:140 errors:0 dropped:0 overruns:0 frame:0
          TX packets:140 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:12068 (12.0 KB)  TX bytes:12068 (12.0 KB)

peth0     Link encap:Ethernet  HWaddr 00:21:5e:96:07:94
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:72 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:5868 (5.8 KB)  TX bytes:3760 (3.7 KB)
          Interrupt:30 Memory:92000000-92012800

root@UbuntuTST-Blade:~# brctl show
bridge name     bridge id               STP enabled     interfaces
eth0            8000.00215e960794       no              peth0

After starting the domU, the xm create just hangs, and the domU stays in paused state for 1m40s :
root@UbuntuTST-Blade:~# brctl show
bridge name     bridge id               STP enabled     interfaces
eth0            8000.00215e960794       no              peth0
                                                        tap1.0
root@UbuntuTST-Blade:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:21:5e:96:07:94
          inet addr:172.17.4.46  Bcast:172.17.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3795 errors:0 dropped:0 overruns:0 frame:0
          TX packets:808 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:230414 (230.4 KB)  TX bytes:117990 (117.9 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:232 errors:0 dropped:0 overruns:0 frame:0
          TX packets:232 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:20640 (20.6 KB)  TX bytes:20640 (20.6 KB)

peth0     Link encap:Ethernet  HWaddr 00:21:5e:96:07:94
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:3947 errors:0 dropped:0 overruns:0 frame:0
          TX packets:966 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:314792 (314.7 KB)  TX bytes:135314 (135.3 KB)
          Interrupt:30 Memory:92000000-92012800

tap1.0    Link encap:Ethernet  HWaddr 62:0f:06:f9:c4:d0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:55 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 B)  TX bytes:3434 (3.4 KB)

root@UbuntuTST-Blade:~# xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0 31853    16     r-----     32.8
XPTST1                                       1  1024     1     --p---      0.0
root@UbuntuTST-Blade:~#

At this step, if I manually unpause the domain, and cancel the xm create comand to avoid it to destroy the domU after timeout, the domU starts and the network is working.
If I just wait, the domU will be destroyed after timeout, and the tap interface will be removed from the bridge.
So, it really seems to come from the vif-bridge script, but how can I debug it ? Which arguments are passed to it ?


root@UbuntuTST-Blade:~# cat /etc/network/interfaces | grep -v '^#\|^$'
auto lo
iface lo inet loopback
auto eth0
 iface eth0 inet dhcp
root@UbuntuTST-Blade:~#
root@UbuntuTST-Blade:~# cat /etc/xen/XPTST1 | grep -v '^#\|^$'
import os, re
arch = os.uname()[4]
if re.search('64', arch):
    arch_libdir = 'lib64'
else:
    arch_libdir = 'lib'
kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory = 1024
shadow_memory = 8
name = "XPTST1"
vif = [ '' ]
disk = [ 'file:/localstorage/XPTST1.img,hda,w', 'file:/localstorage/install/WindowsXP-Pro-32.iso,hdc:cdrom,r' ]
device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
boot="dc"
sdl=0
vnc=1
vncconsole=1
stdvga=0
serial='pty'
usbdevice='tablet'
root@UbuntuTST-Blade:~#



----- Original Message -----
From: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx, xensource@xxxxxxxxxx
Sent: Wednesday, 22 July, 2009 17:57:23 GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)

> use eth0 as default bridge name ?

I guess , yes.

However,please, post:-

# brctl show
# ifconfig
Content /etc/init.d/networking (how you configure the bridge ?)
Profile of your DomU

Boris.

--- On Wed, 7/22/09, xensource@xxxxxxxxxx <xensource@xxxxxxxxxx> wrote:

From: xensource@xxxxxxxxxx <xensource@xxxxxxxxxx>
Subject: [Xen-users] Xen 3.4.1-rc7 network problem (vif/tap)
To: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Wednesday, July 22, 2009, 11:28 AM

Hi,

I'm now blocked for 2 days on getting the network to work in my domU. Here is
the problem :

The domU refuses to start when a vif is configured. It's just staying paused
for about 1m40s, then the xm create command line give back with an
"Error: Device 0 (vif) could not be connected. Hotplug scripts not working.",
and the domU is destroyed.

Nothing particular in the xend.log, xend-debug.log or qemu-dm-domUname.log.

However, if I manually unpause the domU, and cancel (<CTRL><C>) the xm create
command to avoid the destruction of the domU after the 1m40s timeout, I get a
perfectly working domU with Network. Strangely, the vif network interfaces are
now named tap[domUid].[interface#] (ie tap2.0).

So, my questions :
- Why is there no clear log about vif-bridge script, and how can I debug this
script.
- Why are the interfaces named tapX.X instead of vifX.X ?
- Is there a default name for the bridge interface ? I'm currently using
xenbr0, but I see that some documentations are talking about eth0, should I
use eth0 as default bridge name ?


Thanks,

François.

My config :

root@UbuntuTST-Blade:~# xm info
host                   : UbuntuTST-Blade
release                : 2.6.31-rc3
version                : #8 SMP Mon Jul 20 15:01:16 CEST 2009
machine                : x86_64
nr_cpus                : 16
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 2
cpu_mhz                : 2400
hw_caps                :
bfebfbff:28100800:00000000:00000340:009ce3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 36853
free_memory            : 1043
node_to_cpu            : node0:0-15
node_to_memory         : node0:1043
xen_major              : 3
xen_minor              : 4
xen_extra              : .1-rc7
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Wed Jul 15 13:26:50 2009 +0100 19696:22ef8e900a6d
cc_compiler            : gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4)
cc_compile_by          : root
cc_compile_domain      : local.modernprocessing.lu
cc_compile_date        : Thu Jul 16 21:46:26 CEST 2009
xend_config_format     : 4
root@UbuntuTST-Blade:~#



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