hv_set_ifconfig creates corrupt file for multiple interfaces

[Yonatan Amir]

hv_set_ifconfig will create multiple GATEWAY entries in the interfaces file if there are multiple ethernet interfaces. This causes subsequent calls to ifup for the primary interface to fail with "RTNETLINK answers: File exists".

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-cloud-tools-virtual-lts-xenial 4.4.0.47.50
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
AlsaDevices:
 total 0
 crw-rw----+ 1 root audio 116, 1 Nov 22 20:16 seq
 crw-rw----+ 1 root audio 116, 33 Nov 22 20:16 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.1
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 Nov 22 20:26:27 2016
HibernationDevice: RESUME=UUID=a3b32a0b-59a9-4b50-8d31-a06477933916
InstallationDate: Installed on 2016-11-22 (0 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: Error: command ['lsusb'] failed with exit code 1:
MachineType: Microsoft Corporation Virtual Machine
PciMultimedia:

ProcFB: 0 hyperv_fb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-47-generic root=UUID=31af956a-1342-4e8d-9c74-af0308e00111 ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-47-generic N/A
 linux-backports-modules-4.4.0-47-generic N/A
 linux-firmware 1.157.5
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/23/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 090006
dmi.board.name: Virtual Machine
dmi.board.vendor: Microsoft Corporation
dmi.board.version: 7.0
dmi.chassis.asset.tag: 1923-5120-7734-2680-0264-8714-27
dmi.chassis.type: 3
dmi.chassis.vendor: Microsoft Corporation
dmi.chassis.version: 7.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr090006:bd05/23/2012:svnMicrosoftCorporation:pnVirtualMachine:pvr7.0:rvnMicrosoftCorporation:rnVirtualMachine:rvr7.0:cvnMicrosoftCorporation:ct3:cvr7.0:
dmi.product.name: Virtual Machine
dmi.product.version: 7.0
dmi.sys.vendor: Microsoft Corporation

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.9 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc8

[Yonatan Amir (yonatan-amir)]

I can't test this with the mainline kernel without a matching linux-cloud-tools build. It does however reproduce with 4.4.0-57-generic. I forgot to mention in the description that this is when there are multiple NICs with static IPv4 addresses.

[Joseph Salisbury (jsalisbury)]

Can you see if this is also happening with the latest Zesty kernel? All the packages are available from:

https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/11837051