[Bug 612671] Re: Live Migration Guest Network Stops Responding
Further experimentation on this from building a brand new XP SP2 VM then upgrading it to SP3 and performing migrations seems to be a little better, but not perfect. A migration from node 1 to node 2 (in any order) works for the 1st migration. If a 2nd migration is tried then when it arrives at the back at the original node (i.e. node 1 -> node 2 -> node1) the VM is frozen (hung). CPU usage for the VM process is pegged at 100%. I tried switching the CPU emulation to i686 from x86_64 - this was based on a posting about XP VMs locking up but that does not seem to have made any difference. However, if I have a 'long' delay between migrations (> 30 minutes in what I tried) the migration back /does/ seem to work. This has happened a couple of times, but I've not found out how long the VM needs to be on node 2 before it can successfully migrate back to node 1 (i.e. I tried 30 minutes but that was not specifically chosen as a time to wait). I'm not sure if the wait works in absolutely every case - I'll need to try more experiments. If there are any suggestions on what I can do to help get the cause identified & fixed, let me know. -- Live Migration Guest Network Stops Responding https://bugs.launchpad.net/bugs/612671 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 612671] Re: Live Migration Guest Network Stops Responding
Forgot to also add that a reboot of the XP VM /does/ return networking to a working state - the reboot requires to be done via the VNC remote connection to the console and the windows shutdown/restart option. The actual VM is running and operational but just seems to have lost the network return packets. -- Live Migration Guest Network Stops Responding https://bugs.launchpad.net/bugs/612671 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 612671] Re: Live Migration Guest Network Stops Responding
After much searching, I found what looks like the same bug reported on RedHat : https://bugzilla.redhat.com/show_bug.cgi?id=580806 My set up is the same, bridged networking, XPSP3 (Pro). I am live migrating (migrate --live qemu+ssh://server/system). The servers are AMD64 quad-core - hardware is identical in every way between them so I know there is no hardware variation or cpu variation which accounts for this. (Plus the fact the Ubuntu VMs migrate and work also establishes the system can and does work for different guests) ** Bug watch added: Red Hat Bugzilla #580806 https://bugzilla.redhat.com/show_bug.cgi?id=580806 -- Live Migration Guest Network Stops Responding https://bugs.launchpad.net/bugs/612671 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 612671] Re: Live Migration Guest Network Stops Responding
In further testing, I have found an Ubuntu 9.04 guest /does/ keep network connectivity. My guests which are failing seem to be Windows XP SP3. I've tried configurations with and without the virtio network driver but this does not seem to make any difference. I will post additional information as my debugging finds. If there are specific details required to help track this, please let me know and I'll work to assist. -- Live Migration Guest Network Stops Responding https://bugs.launchpad.net/bugs/612671 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 612671] [NEW] Live Migration Guest Network Stops Responding
Public bug reported: After configuring 2 identical servers with KVM and then trying to migrate an image using bridged networking from one to the other, the guest loses network connectivity after the migration completes. A tcpdump shows the bridged network is passing packets /from/ the guest (a test ping run in the guest via the VNC console) and reply packets are received and bridged back onto the guest network interface without the guest seeing the packet (i.e. packets come from vnet0, sent out on br0, reply comes back from br0, is forwarded onto vnet0 but the guest never sees the reply). tcpdump -n -i vnet0 18:19:47.072378 IP 192.168.35.49 > 192.168.35.4: ICMP echo request, id 512, seq 2816, length 40 This is the echo packet sent by the guest 18:19:47.073119 IP 192.168.35.4 > 192.168.35.49: ICMP echo reply, id 512, seq 2816, length 40 This is the reply coming back except the actual guest does not ever see the reply. # lsb_release -rd Description:Ubuntu 10.04.1 LTS Release:10.04 The packet forwarding seems to go amiss on the bridge or in qemu or libvirt - there are a number of posts online with people finding similar problems but nothing ever seems to answer why or how to fix it that I've found. brctl show # brctl show bridge name bridge id STP enabled interfaces br0 8000.001517c8ef5e no eth1 eth2 vnet0 brctl showstp br0 br0 bridge id 8000.001517c8ef5e designated root8000.001517c8ef5e root port 0path cost 0 max age 20.00 bridge max age20.00 hello time2.00 bridge hello time 2.00 forward delay 0.00 bridge forward delay 0.00 ageing time 300.00 hello timer 1.64 tcn timer 0.00 topology change timer 0.00 gc timer 0.64 flags eth1 (1) port id8001state disabled designated root8000.001517c8ef5e path cost100 designated bridge 8000.001517c8ef5e message age timer 0.00 designated port8001forward delay timer0.00 designated cost 0hold timer 0.00 flags eth2 (2) port id8002stateforwarding designated root8000.001517c8ef5e path cost 4 designated bridge 8000.001517c8ef5e message age timer 0.00 designated port8002forward delay timer0.00 designated cost 0hold timer 0.64 flags vnet0 (3) <-- the guest nic port id8003stateforwarding designated root8000.001517c8ef5e path cost100 designated bridge 8000.001517c8ef5e message age timer 0.00 designated port8003forward delay timer0.00 designated cost 0hold timer 0.64 flags ** Affects: libvirt (Ubuntu) Importance: Undecided Status: New ** Tags: bridge libvirt migrate -- Live Migration Guest Network Stops Responding https://bugs.launchpad.net/bugs/612671 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 580568] Re: Hylafax is sending blank pages.
Indeed, this does fix the problem of Ubuntu 10.04 LTS hylafax sending blank pages for me. I modified bin/pdf2fax.gs as described by adding the -dMaxStripSize=0 onto the GS command at the end of the file and that fixed the problem. As this fix has been around for around a month and seems to be correct it would be great to see it added to the online updates - it does not seem to have much likelihood of breaking anything else so looks like a nice clean fix to roll out. Patch file is trivial and attached. ** Patch added: "Patch file of fs2fax.gs to fix blank pages sent by hylafax Ubunto 10.04 LTS" http://launchpadlibrarian.net/49954331/hylafax.patch -- Hylafax is sending blank pages. https://bugs.launchpad.net/bugs/580568 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 568050] Re: Ubuntu 10.04 can't create partition on fakeraid
I've tried to install 10.04 RC on an nVidia RAID5 (fakeraid using dmraid) via alternate and main install and both fail to load any dmraid drivers at all (none - not even RAID0/1). dmraid seems to be completely broken in the RC - the installer offers to activate it but nothing is detected afterwards and a manual attempt reports missing modules. Also, as per previous Ubuntu versions, the dmraid-activate seems to mess up the raid45 driver stuff anyway - I always have the manually install the modules during installation and then edit dmraid-activate to change the module load to dm-raid4-5 and the rebuild the initrd before rebooting otherwise the install is messed up. There are various past bug reports on this so I'm not going to repeat them as it's been reported enough times already without me duplicating it further. I saw one posting (elsewhere) suggesting just using software raid - while that's probably a fair suggestion, the dmraid really should work when it is detecting the fakeraid controller is there and offering it. -- Ubuntu 10.04 can't create partition on fakeraid https://bugs.launchpad.net/bugs/568050 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
