virtio guest nics doesn't have network connectivity

[Eliezer Croitoru]

Before the update to this version of the kernel the VM's could recieve DHCP and contact the network.
Once I updated the server to 4.4.0-66 my guest VM's cannot communicate with the network.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-66-generic 4.4.0-66.87
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
AlsaDevices:
 total 0
 crw-rw----+ 1 root audio 116, 1 Mar 21 11:36 seq
 crw-rw----+ 1 root audio 116, 33 Mar 21 11:36 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Tue Mar 21 11:39:57 2017
HibernationDevice: RESUME=UUID=a7f50198-2eb8-48c6-8051-06bce803d426
InstallationDate: Installed on 2017-02-15 (33 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0624:0249 Avocent Corp. Virtual Keyboard/Mouse
 Bus 001 Device 002: ID 413c:a001 Dell Computer Corp. Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge R230
PciMultimedia:

ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic root=UUID=a86fd17c-b858-4b47-8e9f-6059eda9c38c ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-66-generic N/A
 linux-backports-modules-4.4.0-66-generic N/A
 linux-firmware 1.157.8
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/28/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.2
dmi.board.name: 0MFXTY
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.2:bd03/28/2016:svnDellInc.:pnPowerEdgeR230:pvr:rvnDellInc.:rn0MFXTY:rvrA01:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R230
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Eliezer Croitoru (eliezer)]

When I am adding the next rule to iptables it all works magically
iptables -I FORWARD -j ACCEPT

But it's a bridge...

[Joseph Salisbury (jsalisbury)]

Does this bug go away if you boot back into the prior kernel version?

[Eliezer Croitoru (eliezer)]

@joseph, I found out the coulprit after getting to the same possition with a CentOS system and trying couple kernels.
The issue is being caused by a docker package from the "official" repository.
The issue was resolved with the 4.6 kernel since it didn't had the aufs module and there for the docker could not start and do harm.
Once I disable the docker service and reboot the system is back up and running.
But the issue accured with both 4.4.0-x 4.6.x 4.8.0-x when I managed to make the docker start up.
It happen only after upgrading the system so I cannot find the exact version of docker it started.