- Updating -
The problem came back today - the VM was running OK for more than 72
hours - and then the connectivity with the gateway was lost again.
Looking Martin's post #132, I was seeing some packets being dropped by
being incorrect. Applied the ethtool fix and also changed the driver to
If this problem is related to this one -
https://bugs.launchpad.net/ubuntu/+source/qemu-
kvm/+bug/1325560?comments=all - then upgrading the kernel should fix it.
In my case I'm using Ubuntu 14.04 with kernel 3.13 and after upgrading
to kernel 3.16, no more connectivity problems.
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Title:
KVM
I report the same situation as comment 129.
Spark Cluster installed with Ambari 1.7, installed HDP 2.2 running Zookeeper,
Ganglia, HDFS and YARN.
Ubuntu 12.04
uname -r
3.2.0-67-virtual
Instances running fine until the start of a Spark of Hadoop job with YARN. The
Job gets accepted but then 2
My problem with missing arp replies was solved( worked around) by setting
bridge_ageing 0
for the bridge in /etc/network/interfaces, making it a hub forwarding all
packets to all hosts.
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Looks like I have this problem on 12.04.1 LTS with kernel
3.2.0-67-generic #101-Ubuntu SMP Tue Jul 15 17:46:11 UTC 2014 x86_64
x86_64 x86_64 GNU/Linux on the host and Debian Wheezy on the guest (SMP
Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux)
The guest will occationally loose connection with other
I faced probably the same problem installing Xen-4.3.2 with Gentoo
kernel-3.12.21.
DomU's interface hangs after short time under heavy network load
(starting at ~10Mbyte/s). From outside it looks, like the instance would
crash, but deactivating and activating the interface e.g. form the xl
Yes, I think it is safe to say that the bug is still around. The VM
loses network connectivity under enough load. I, for example can
reproduce this by running a spark job which transfers a few gigabytes of
data between worker VMs. And within a minute one of the VMs lose network
connectivity. If I
@ezhaar - please open a new bug so we can collect new information. If
you are on trusty then please file against qemu, othewise file against
qemu-kvm. Then mark it as also affecting libvirt and linux (the
kernel). Then reproduce the bug, and immediately after the crashes do
'apport-collect
Very easily reproducible on my side.
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Title:
KVM images lose connectivity with bridged network
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We're running qemu-kvm 1.0+noroms-0ubuntu14.13 on a 12.04.4 LTS with KVM
based 12.04.4 LTS virtual machines , and have observed this problem.
We have been using the regular software bridges on many machines, and
have only noticed the problem on one of our newest servers.
Using virtio devices we
Thanks Thomas for your speedy reply. Now my CentOS uname -a is version
3.5.0. My tap0 lockup problem is exactly the same as with the older
kernel. Anything else you would suggest?
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My web search reveals this problem has been around for years and most
posts conclude that the problem continues. After solving my tap0 TX
packets dropped problem, I find that my VM network has random freezes a
few times each day. Many bloggers on this subject say this VM network
freeze is
After moving to 3.5 kernel I haven't seen it, even at 3x traffic which used
to cause it
On Mar 25, 2014 9:06 PM, Dewey McDonnell de...@poslinker.com wrote:
My web search reveals this problem has been around for years and most
posts conclude that the problem continues. After solving my tap0 TX
I think I may have the same problem running a 13.10 qemu-kvm host with 8
virtual machines. As far as I can see only two VMs seem to have the
problem. All of them use em1: macvtap as source device and a bridge as
source mode. After reading many posts here, I changed from virtio to
rtl8139 as a
I have to clarify that I'm not sure that this has something to do with
KVM, QEMU and the like.
I think is more a problem of the linux bridge driver since It fails even
if you don't have any vm running. Yes, it takes more time to fail but
this can be because not enough traffic to make it fail.
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I've found this problem in my saucy installation. I just opened a bug
cause I'm not sure if it's related.
https://bugs.launchpad.net/ubuntu/+source/core-network/+bug/1255516
My problem is actually worse since host machine cannot get access to
other machines on the network. Not even virtual
@BenKochie,
could you please file a new bug with details?
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Title:
KVM images lose connectivity with bridged network
To
Will there be a fix for 10.04 lucid, too?
I think this bug affects me too: Windows SBS 2008 with virtio network driver on
ubuntu 10.04 lucid host loses network connection from time to time. It's not
really deterministic when this error occurs. Usually it happens when there's a
large amount of
I'm testing this some more, and it looks like it's still easy to
reproduce on my system.
cc2ab6833adc73311a2407be2eb5f915 /usr/bin/qemu-system-x86_64
I can cause the guest to drop VM networking with an rsync+ssh from a
nearby host.
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But otherwise it sounds like it looked the same - VM still up but its
network down?
Had these VMs been running for 50 days, or was it that you hadn't seen
the problem in 50 days? If the latter, could these have been on a newer
kernel?
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So I'm sorry to report that after about 50 days of uptime on qemu-kvm
(1.0+noroms-0ubuntu14.3) I had 3 VMs out of ~60 in my cluster drop off
the network. It happened on different host machines, so it's not a
single machine in the cluster that's a problem.
Two of the nodes were restarted (full
This bug is considered fixed for me. Not a single network glitch since
installing the package from PPA. Many thanks to the development team!
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Same here, thank you everyone!
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On Friday, November 2, 2012 at 5:42 AM, Jonathan Tullett wrote:
This bug is considered fixed for me. Not a single network glitch since
installing the package from PPA. Many thanks to the development team!
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I got the same issue, but my host OS is RHEL 6.3 (2.6.32-220.el6.x86_64), the
qemu-kvm version is 0.12.1.2 , and my guest base image is Ubuntu 12.4 LTS.
My problem is:
After I enable the libvirt_use_virtio_for_bridges = true in the nova.conf, the
new instance can not get ip address and the
This bug was fixed in the package qemu-kvm - 1.0+noroms-0ubuntu14.3
---
qemu-kvm (1.0+noroms-0ubuntu14.3) precise-proposed; urgency=low
* Fix race condition in virtio code on multicore systems. (LP: #997978)
- 9001-virtio-add-missing-mb-on-notification.patch
-
** Changed in: qemu-kvm (Ubuntu Precise)
Status: Fix Committed = Fix Released
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Title:
KVM images lose connectivity with
** Changed in: qemu-kvm (Ubuntu Precise)
Status: Fix Released = Fix Committed
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Title:
KVM images lose connectivity with
** Tags removed: verification-needed
** Tags added: verification-done
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Title:
KVM images lose connectivity with bridged
Installed yesterday and rebooted the dom0 machine and thus all virtual
machines. Will report back if there are any problems.
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We tested the -proposed packages yesterday and are confident that they
resolve the issue. We used the test scenario described in comment #101.
Servers that have not had the updated package applied failed the test
within an hour. Servers with the updated package did not fail the test.
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Hello Jonathan, or anyone else affected,
Accepted qemu-kvm into precise-proposed. The package will build now and
be available at http://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-
0ubuntu14.2 in a few hours, and then in the -proposed repository.
Please help us by testing this new package.
Ignore the above automated message, the precise fix that was in the
queue was superseded by a security update of the same version.
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Hi Adam,
Does this mean that the qemu fix for this ticket is not in -proposed
yet? Or that the security update contains the fix?
Thanks,
Joe
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As far as I can tell the fix is still not released in -proposed
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Title:
KVM images lose connectivity with bridged network
To
The security update doesn't contain the fix, the original proposed
update needs to be rebased against the security update. I may do that
in a bit if Soren doesn't get there first.
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Hello Jonathan, or anyone else affected,
Accepted qemu-kvm into precise-proposed. The package will build now and
be available at http://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-
0ubuntu14.3 in a few hours, and then in the -proposed repository.
Please help us by testing this new package.
I have installed this package on two of my OpenStack compute nodes. I'll
have an update in a day or so on if this package still fixes the issue
like the package from Soren's PPA.
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Matt, are the symptoms identical? You might be experiencing a different
bug entirely.
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Title:
KVM images lose connectivity
Soren,
We have a 12.04 based OpenStack cluster with 4 host nodes running about 30 VMs
currently.
We performed the steps to add the kvm-network-hang repo and updated to the
latest version on the host machines, then rebooted the instances. My
understanding is that this should catch the update,
...@isgsoftware.net
Sent: Tuesday, September 25, 2012 12:07:44 PM
Subject: [Bug 997978] Re: KVM images lose connectivity with bridged network
Soren,
We have a 12.04 based OpenStack cluster with 4 host nodes running about 30 VMs
currently.
We performed the steps to add the kvm-network-hang repo
Running sudo reboot from the VM doesn't change the PID, but using the reboot
command on the openstack dashboard does.
It seems like some of our VMs used the former, and some the later, with
correlation between the soft reboot and the instance dying. So we'll hard
reboot the vms, and profusely
Matt, no problem at all. Please be sure to report back if you encounter
the issue again after the hard reboot. Thanks!
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Title:
Hello,
Prior to applying the qemu package in Soren's PPA, we were able to
reproduce this problem within 45 minutes (on average). We're now up to
22 hours (and climbing) without an issue.
If anyone is curious, here is the test setup that we have been using
with OpenStack:
---
nova boot --image
I updated qemu-kvm package from ppa:ubuntu-virt/kvm-network-hang.
I started next test to load network on VMs -
On VM 1 :
% nc -k -l 0.0.0.0 4242 /dev/null
On VM 2:
% cat /dev/zero | nc IP 4242
There is no problems with this VMs from 12/Sep/2012 .
So qemu-kvm package from this PPA resolved this
** No longer affects: ifenslave (Ubuntu)
** No longer affects: libvirt (Ubuntu)
** No longer affects: bridge-utils (Ubuntu)
** No longer affects: linux (Ubuntu)
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** Also affects: qemu-kvm (Ubuntu Precise)
Importance: Undecided
Status: New
** Changed in: qemu-kvm (Ubuntu)
Status: Confirmed = Fix Released
** Changed in: qemu-kvm (Ubuntu Precise)
Status: New = In Progress
** Changed in: qemu-kvm (Ubuntu Precise)
Importance:
** Description changed:
+ =
+ SRU Justification:
+ 1. Impact: networking breaks after awhile in kvm guests using virtio
networking
+ 2. Development fix: The bug was fixed upstream and the fix picked up in a new
+merge.
+ 3. Stable fix: 3 virtio patches
Lovely, thanks for the feedback. I've just uploaded this to precise-
proposed.
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Title:
KVM images lose connectivity with
We have been testing the kvm-network-hang patch in our production setup
since 9/17. We just saw our second failure. This is much improved from
the multiple failure per day we were seeing, I don't think its fixed
yet.
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Title:
KVM images lose connectivity with bridged network
Ok, this bug seems to be about KVM networking bugs in Ubuntu. I don't
see anything specific for upstream OpenStack developers to debug or fix.
Marking as Invalid.
If there is some specific OpenStack upstream issue diagnosed, it's
probably best to file a new bug with the details of the specific
** Changed in: nova
Status: New = Invalid
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Title:
KVM images lose connectivity with bridged network
To manage
@Metin,
will you be able to test with the kernel Soren proposed in comment #89,
or is that hardware now taken?
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Title:
Soren,
thanks very much. It's probably best to use a new ppa, as the backports
may be more generally useful, and would force unfortunate versioning
games.
Just using ppa:ubuntu-virt/ppa should probably be fine too.
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Packages are ready for testing in the all new ubuntu-virt/kvm-network-
hang PPA.
It has a lower version than the test package Serge posted earlier, so
you'll need to first disable that other PPA and then enable this one and
upgrade.
This should do the trick:
# You can skip these first two
@Peng Yong. Yes, you can. There is a package called ppa-purge in the
official repositories. Install it. It will allow you to revert to
official packages at will.
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As Serge says, we think we've narrowed in on the set of commits that
will address this problem:
a821ce5 virtio: order index/descriptor reads
92045d8 virtio: add missing mb() on enable notification
a281ebc virtio: add missing mb() on notification
I'd be happy to provide a SRU candidate
I can test that. I had to use the hardware to deal with a separate issue
but I loaded up the backported package on Friday and I have been running
a test over the weekend. No problems yet.
Sent from my iPhone
On Sep 3, 2012, at 1:21 AM, Soren Hansen so...@linux2go.dk wrote:
As Serge says, we
confirm the issue.
if i upgrade to the ppa, can i upgrade to official package later? how
long will the ppa become official package?
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I am absolutely sure that at least with me, this is fixed. Whole working
week and not a single incident. It used to be several every day last
week (before I updated to the PPA)
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Thanks for the feedback.
I've looked through the commit log and found no obvious single or group
of commits which would solve this.
We could talk about backporting the quantal packages into precise -
however the quantal packages do appear to also bring in their own
regressions, for instance bug
Soren has suggested commit a281ebc11a6917fbc27e1a93bb5772cd14e241fc
('virtio: add missing mb() on notification') seems a likely candidate
for a fix.
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I am also seeing the problem on our Ganeti managed KVM under Ubuntu
12.04. In our case on those servers with higher network load,
connectivity to the guest is lost but may take one to two days. The
one server with low network traffic has never lost connectivity.
By the way the loss of
@Serge
Yes, still no incidents. Haven't updated the machine since.
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Title:
KVM images lose connectivity with bridged
I installed the new packages on Monday and have not had any issues.
That said, I was only experiencing failures once every 3-4 weeks. So I
don't think my data point will be valid for at least a few weeks.
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Quoting Gary Cuozzo (g...@isgsoftware.net):
I installed the new packages on Monday and have not had any issues.
That said, I was only experiencing failures once every 3-4 weeks. So I
don't think my data point will be valid for at least a few weeks.
Thanks, Gary, will wait before making
@Metin,
still no incidents?
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Title:
KVM images lose connectivity with bridged network
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So far no VMs have lost their network connectivity.
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Title:
KVM images lose connectivity with bridged network
To manage
Today I see there is a new qemu-kvm package on the PPA. Installed. Let's
se what happens.
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Title:
KVM images lose
This bug also affects me.
I run several VMs on the same host. A mix of ubuntu 11.10 and 12.04. The
problem occurs regardless of guest OS.
I was experiencing the problem for months, though it was occuring rarely and I
didn't search for a solution. Recently it started happening every day
I think the big is in the guest code. Did you try 10.04 LTS?
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Title:
KVM images lose connectivity with bridged network
To
No I might try it later today (as a guest)
I installed the PPA to the host. From what I can see, the situation is
even worse. Had several failures in the first 2 hours since.
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Quoting Metin Akat (997...@bugs.launchpad.net):
No I might try it later today (as a guest)
I installed the PPA to the host. From what I can see, the situation is
even worse. Had several failures in the first 2 hours since.
Thanks, that's valuable information.
(Yes, the ppa was to be
I will test too
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Title:
KVM images lose connectivity with bridged network
To manage notifications about this bug go to:
Your ubuntu-virt ppa is actually coming up with no canidate repo. Did
this already get merged into the mainline?
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Title:
Anecdotal evidence[1] suggests that this is a problem with the driver in
the guest. It would be interesting to learn when this problem appeared
and if it's gone with Quantal guests.
[1]: http://lists.openstack.org/pipermail/openstack-
operators/2012-August/001921.html
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@Thomas,
I'm sorry, that should be 'ppa:ubuntu-virt/backports' (plural, not
singular).
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Title:
KVM images lose
There's a quite interesting thread in the openstack mailing list. May
not be related to this bug but I guess it's worth investigating in any
case:
http://markmail.org/message/xrvipkn2pvln2qty
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Regarding comment #55:
I don't believe this is a guest OS issue. In my comment #51 I also indicate
that I have had non-precise vm's (specifically 11.10) experience the same issue.
I have only experienced this issue when using 12.04 precise as the host
OS. On a customer server which I
Quoting Gary Cuozzo (g...@isgsoftware.net):
Regarding comment #55:
I don't believe this is a guest OS issue. In my comment #51 I also indicate
that I have had non-precise vm's (specifically 11.10) experience the same
issue.
I have only experienced this issue when using 12.04 precise as
I can test that today.
Sent from my iPhone
On Aug 16, 2012, at 7:11 AM, Serge Hallyn 997...@bugs.launchpad.net
wrote:
Quoting Gary Cuozzo (g...@isgsoftware.net):
Regarding comment #55:
I don't believe this is a guest OS issue. In my comment #51 I also indicate
that I have had non-precise
Hi Serge,
I would be willing to install your ppa packages. The only issue on my end is
that this problem only occurs every 3-4 weeks for me. So I don't think I would
be able to give any sort of concrete feedback for whether it addresses the
issue or not.
My customer's server was having the
as a counter-example, our original deployment of eight 12.04 guests on
12.04 hosts were dropping off the network regularly. when the guests
were reinstalled as 10.04 (on the same hosts, with the same workload)
the problem did not recur.
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Thanks, Gary, I've pushed a test package, with
version0.9.13-0ubuntu7ppa1, to ppa:ubuntu-virt/backport. Once it
builds, you can install it with
sudo add-apt-repository ppa:ubuntu-virt/backport
sudo apt-get update
sudo apt-get -y dist-upgrade
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Sorry. Obviously that needs to be qemu-kvm. I'll add that in a few
minutes.
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Title:
KVM images lose connectivity with
I have bonding, I have seen this both with and without vhost_net module.
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Title:
KVM images lose connectivity with bridged
Causes nova network connectivity to freeze and be unresponsive
** Also affects: nova
Importance: Undecided
Status: New
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The following from comment #51:
rebooting the guest fixes the problem until it happens again. The reboot
does not actually kill the kvm session and get a new process ID, but
somehow having the guest go through the init again fixes it (until it
happens again some period later).
makes me suspect
Nothing concrete or that I can distribute unfortunately. I was able to
reproduce it with an infinitely long bi-direction iperf but right now I
am testing our internal web services under production level loads. I've
yet to reproduce the problem after loading the vhost_net module but i'll
need more
we had 12.04 vms experiencing these hangs regularly (sometimes only
staying online for hours). after enabling vhost_net there was a period
of weeks without issue but a few days one of them hung again with the
same (or very similar) symptoms. an ifdown/ifup from within the guest
brought it back
I have seen this issue on 2 different servers which use bridging but not
bonding.
One server was a customer system and we were forced to back-date the OS
to an earlier release. They were experiencing the issue up to once/day
and quickly got impatient to have it resolved.
The other server is an
I'm noticing the same behavior on 12.04 hosts with 12.04 guests. No
bonding. I'm currently running a test with two identical VMs, one
started after modprobing vhost_net
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ifenslave (Ubuntu)
Status: New = Confirmed
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Hi,
could anyone who has reproduced this without bonding please comment
here?
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Title:
KVM images lose connectivity with
Switching to eth0 slave to bond0 inside br0 does not help me to
reproduce.
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Title:
KVM images lose connectivity with
** Also affects: ifenslave (Ubuntu)
Importance: Undecided
Status: New
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Title:
KVM images lose connectivity with
@Eugene,
I ran that test case on precise for 3.5 hours, with virtio network
bridged with eth0 and without the vhost_net kernel module loaded, but
network never hung.
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On quantal, I can't get such a VM to run without it automatically
loading vhost_net. The following kvm command
sudo kvm -hda x.img -netdev tap,ifname=tap0,id=hostnet0,vhost=on -device
virtio-net-
pci,netdev=hostnet0,id=net0,mac=52:54:00:d8:33:46,bus=pci.0,addr=0x3
-vnc :1
causes vhost_net to
I have faced with the same bug
When a VM using virtio-net driver receives too much network traffic, the
network interface stops working.
Steps to reproduce -
On VM (with virtio-net):
% nc -k -l 0.0.0.0 4242 /dev/null
On another machine (baremetal or VM):
% cat /dev/zero | nc IP 4242
After
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