Public bug reported:
Reproduced with 16.04.4 LTS and Citrix Xenserver 7.0, 7.1, 7.4.
Some packet loss is observed after upgrading to 4.4.0-130-generic when the
traffic is routed via VM.
Steps to reproduce:
1) Using Citrix Xenserver, set up Ubuntu server VM, upgrade to 4.4.0-130-generic
2) Enable IP forwarding
3) Send any traffic via this VM (for ex. icmp ping)
4) Packets leaving the VM may not reach the second VM on the same physical host
or not leave the physical host machine
5) Packets coming to a physical host machine interface may not reach the
virtual machine
Rollback to 4.4.0-128-generic helps.
A file with tcpdump results and a brief explanation is attached.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-130-generic 4.4.0-130.156
ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
Uname: Linux 4.4.0-130-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 9 11:24 seq
crw-rw---- 1 root audio 116, 33 Jul 9 11:24 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
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: Mon Jul 9 13:18:47 2018
InstallationDate: Installed on 2018-06-04 (34 days ago)
InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.8)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Xen HVM domU
PciMultimedia:
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-130-generic
root=UUID=46979d34-98b0-470f-9f1f-29147de9f253 ro ipv6.disable=1 net.ifnames=0
biosdevname=0
RelatedPackageVersions:
linux-restricted-modules-4.4.0-130-generic N/A
linux-backports-modules-4.4.0-130-generic N/A
linux-firmware 1.157.19
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/14/2018
dmi.bios.vendor: Xen
dmi.bios.version: 4.7.5-4.4
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias:
dmi:bvnXen:bvr4.7.5-4.4:bd06/14/2018:svnXen:pnHVMdomU:pvr4.7.5-4.4:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.7.5-4.4
dmi.sys.vendor: Xen
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
** Attachment added: "tcpdump with a brief explanation"
https://bugs.launchpad.net/bugs/1780761/+attachment/5161328/+files/bug
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1780761
Title:
kernel 4.4.0-130-generic - packet loss with ip forward
Status in linux package in Ubuntu:
New
Bug description:
Reproduced with 16.04.4 LTS and Citrix Xenserver 7.0, 7.1, 7.4.
Some packet loss is observed after upgrading to 4.4.0-130-generic when the
traffic is routed via VM.
Steps to reproduce:
1) Using Citrix Xenserver, set up Ubuntu server VM, upgrade to
4.4.0-130-generic
2) Enable IP forwarding
3) Send any traffic via this VM (for ex. icmp ping)
4) Packets leaving the VM may not reach the second VM on the same physical
host or not leave the physical host machine
5) Packets coming to a physical host machine interface may not reach the
virtual machine
Rollback to 4.4.0-128-generic helps.
A file with tcpdump results and a brief explanation is attached.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-130-generic 4.4.0-130.156
ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
Uname: Linux 4.4.0-130-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 9 11:24 seq
crw-rw---- 1 root audio 116, 33 Jul 9 11:24 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
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: Mon Jul 9 13:18:47 2018
InstallationDate: Installed on 2018-06-04 (34 days ago)
InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.8)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Xen HVM domU
PciMultimedia:
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-130-generic
root=UUID=46979d34-98b0-470f-9f1f-29147de9f253 ro ipv6.disable=1 net.ifnames=0
biosdevname=0
RelatedPackageVersions:
linux-restricted-modules-4.4.0-130-generic N/A
linux-backports-modules-4.4.0-130-generic N/A
linux-firmware 1.157.19
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/14/2018
dmi.bios.vendor: Xen
dmi.bios.version: 4.7.5-4.4
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias:
dmi:bvnXen:bvr4.7.5-4.4:bd06/14/2018:svnXen:pnHVMdomU:pvr4.7.5-4.4:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.7.5-4.4
dmi.sys.vendor: Xen
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