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[ChristianEhrhardt <1570195@xxxxxxxxxxxxxxxxxx>]

Other than in the upstream discussion I linked above around a similar - but it seems not related - issue in our case interrupts, memory, and such from lspci and /proc/interrupts stay just "as-is".
No change due to running dpdk on that device.

I'd not even consider it all too broken if the tools say "go away I'm broken" until the device was reinitialized by e.g. the driver reload.
But the hang is too severe.

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https://bugs.launchpad.net/bugs/1570195

Title:
  Net tools cause kernel soft lockup after DPDK touched  VirtIO-pci
  devices

Status in dpdk package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Guys,

   I'm facing an issue here with both "ethtool" and "ip", while trying
  to manage black-listed by DPDK PCI VirtIO devices.

   You'll need an Ubuntu Xenial KVM guest, with 4 VirtIO vNIC cards, to
  run those tests

   PCI device example from inside a Xenial guest:

  ---
  # lspci | grep Ethernet
  00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
  00:04.0 Ethernet controller: Red Hat, Inc Virtio network device
  00:05.0 Ethernet controller: Red Hat, Inc Virtio network device
  00:06.0 Ethernet controller: Red Hat, Inc Virtio network device
  ---

  Where "ens3" is the first / default interface, attached to Libvirt's
  "default" network. The "ens4" is reserved for "ethtool / ip" tests
  (attached to another Libvirt's network without IPs or DHCP), "ens5"
  will be "dpdk0" and "ens6" "dpdk1"...

  ---
   *** How it works?

   1- For example, try to enable multi-queue on DPDK's devices, boot
  your Xenial guest, and run:

   ethtool -L ens5 combined 4
   ethtool -L ens6 combined 4

   2- Install openvswitch-switch-dpdk configure DPDK and OVS and fire it
  up.

   https://help.ubuntu.com/16.04/serverguide/DPDK.html

   service openvswitch-switch stop
   service dpdk stop

   OVS DPDK Options (/etc/default/openvswitch-switch):

  --
  DPDK_OPTS='--dpdk -c 0x1 -n 4 --socket-mem 1024 --pci-blacklist 0000:00:03.0,0000:00:04.0'
  --

   service dpdk start
   service openvswitch-switch start

   - Enable multi-queue on OVS+DPDK inside of the VM:

   ovs-vsctl set Open_vSwitch . other_config:n-dpdk-rxqs=4
   ovs-vsctl set Open_vSwitch . other_config:pmd-cpu-mask=0xff00

   * Multi-queue apparently works! ovs-vswitchd consumes more that 100%
  of CPU, meaning that it multi-queue is there...

   *** Where it fails?

   1- Reboot the VM and try to run ethtool again (or go straight to 2
  below):

   ethtool -L ens5 combined 4

   2- Try to fire up ens4:

   ip link set dev ens4 up

  
   # FAIL! Both commands hangs, consuming 100% of guest's CPU...

   So, it looks like a Linux fault, because it is "allowing" the DPDK
  VirtIO App (a user land App), to interfere with kernel devices in a
  strange way...

  Best,
  Thiago

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-generic 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 14 00:35 seq
   crw-rw---- 1 root audio 116, 33 Apr 14 00:35 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser'
  CRDA: N/A
  Date: Thu Apr 14 01:27:27 2016
  HibernationDevice: RESUME=UUID=833e999c-e066-433c-b8a2-4324bb8d56de
  InstallationDate: Installed on 2016-04-07 (7 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Beta amd64 (20160406)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-18-generic root=UUID=9911604e-353b-491f-a0a9-804724350592 ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-wily
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-wily:cvnQEMU:ct1:cvrpc-i440fx-wily:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-wily
  dmi.sys.vendor: QEMU

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