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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.


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 (20160719)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug xenial
unregister_netdevice: waiting for eth0 to become free. Usage count = 5
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