Fails with the kernel in -updates, 4.15.0-176.

Works with kernel in -proposed, 4.15.0-177.

ubuntu@bionic:~$ uname -r
4.15.0-177-generic
ubuntu@bionic:~$ sudo modprobe ip6_gre
ubuntu@bionic:~$ unshare -Urn true
ubuntu@bionic:~$ unshare -Urn true
ubuntu@bionic:~$ unshare -Urn true
ubuntu@bionic:~$ dmesg | tail -2
[   14.212867] gre: GRE over IPv4 demultiplexor driver
[   14.218947] ip6_gre: GRE over IPv6 tunneling driver
ubuntu@bionic:~$ 


** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1968340

Title:
  ip6gre driver does not hold device reference

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  When creating ip6gre interfaces in network namespaces, device references are 
not held, preventing further network namespaces from being created.

  [Test case]
  sudo modprobe ip6_gre
  unshare -Urn true
  unshare -Urn true

  The second unshare won't work and there will be "unregister_netdevice:
  waiting for ip6gre0 to become free. Usage count = -1" messages on
  kernel log.

  [Potential regression]
  ip6gre users can observe regressions.

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