I built a Bionic test kernel with commit 510c321.  The test kernel can be 
downloaded from:

Can you test this kernel and see if it resolves this bug?

Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.

Artful requires some back porting of that commit, so I'll perform the back port 
and post that kernel shortly.

Thanks in advance!

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  unregister_netdevice: waiting for eth0 to become free. Usage count = 5

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  This occurs when tearing down an LXD container.

  LXD monitor process hangs with the following stack:

  $ sudo cat /proc/27043/stack
  [<ffffffff8af0022e>] msleep+0x2e/0x40
  [<ffffffff8b5dc9cf>] netdev_run_todo+0x11f/0x310
  [<ffffffff8b5e9d4d>] rtnetlink_rcv+0x2d/0x30
  [<ffffffff8b612cdc>] netlink_unicast+0x18c/0x240
  [<ffffffff8b61306d>] netlink_sendmsg+0x2dd/0x3c0
  [<ffffffff8b5b8f08>] sock_sendmsg+0x38/0x50
  [<ffffffff8b5b99c3>] ___sys_sendmsg+0x2e3/0x2f0
  [<ffffffff8b5ba354>] __sys_sendmsg+0x54/0x90
  [<ffffffff8b5ba3a2>] SyS_sendmsg+0x12/0x20
  [<ffffffff8ae03a7b>] do_syscall_64+0x5b/0xc0
  [<ffffffff8b800257>] entry_SYSCALL64_slow_path+0x8/0x8
  [<ffffffffffffffff>] 0xffffffffffffffff

  Issue submitted to LXD as well ([1]), though as indicated there, it
  seems to be a kernel bug.

  [1] https://github.com/lxc/lxd/issues/4208

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.13.0-32-generic 4.13.0-32.35~16.04.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Wed Jan 31 11:42:59 2018
  InstallationDate: Installed on 2016-11-09 (447 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  SourcePackage: linux-hwe
  UpgradeStatus: No upgrade log present (probably fresh install)

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