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 -- 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/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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1968340/+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
