[just replying on libvir-list] Am 26. Nov 2014, 00:15 schrieb Richard Weinberger <richard.weinberger@gmail.com>:
I plan to send the pull request to Linus as soon as I have caught my breath (from all of the conferences this week) that I can be certain I am thinking clearly and not rushing things.
Today I've upgraded my LXC testbed to the most recent kernel and found libvirt-lxc broken again (sic!). Remounting /proc/sys/ is failing. Investigating into the issue showed that commit "mnt: Implicitly add MNT_NODEV on remount as we do on mount" is not mainline. Why did you left out this patch? In my previous mails I explicitly stated that exactly this commit unbreaks libvirt-lxc.
Now the userspace breaking changes are mainline and hit users hard. :-(
I can confirm that userns with libvirt-lxc and 3.17-rc* is broken and the (kernel) commit in question fixes the issue. Best, Matthias