We have performed kernel bisect, git bisect log is attached. The results show:
2e118dcfc70978d2c8b7d55ce6d2decc6588ee62 is the first bad commit commit 2e118dcfc70978d2c8b7d55ce6d2decc6588ee62 Author: Ross Lagerwall <ross.lagerw...@citrix.com> Date: Thu Jan 11 09:36:38 2018 +0000 xen-netfront: Fix race between device setup and open ** Attachment added: "bisect_log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1780761/+attachment/5163184/+files/bisect_log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1780761 Title: kernel 4.4.0-130-generic - packet loss with ip forward Status in linux package in Ubuntu: Confirmed 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1780761/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
