Public bug reported:
During a stateful lxd snapshot criu tries to mount sysfs for the
container's network namespace from a different user namespace. This
fails in xenial because sget() won't allow mounting the same super block
in different user namespaces.
With sysfs there's no reason that this needs to use the same super
block, so kernfs can be updated so that a super block with the same ns
tag but in a different userns is not matched. The only other kernfs-
based filesystem mountable from non-init user namespaces is cgroupfs,
and it's already forcing kernfs to return different super blocks to
avoid similar problems. In fact we can revert part of the cgroupfs
changes to make this happen if we push this behavior into kernfs.
** Affects: linux (Ubuntu)
Importance: High
Assignee: Seth Forshee (sforshee)
Status: In Progress
** Affects: linux (Ubuntu Xenial)
Importance: High
Assignee: Seth Forshee (sforshee)
Status: In Progress
** Also affects: linux (Ubuntu Xenial)
Importance: High
Assignee: Seth Forshee (sforshee)
Status: In Progress
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1570906
Title:
sysfs mount failure during stateful lxd snapshots
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1570906/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
