New version of util-vserver ebuild checks for success of "setattr --barrier" call, but this won't work on certain filesystems (notably btrfs and zfs). The barrier is not always needed and is just additional security measure, so the failure should be replaced with a warning noting when it's needed and how to apply it manually. I'll attach a patch that does that later tomorrow.
Created attachment 436646 [details, diff] util-vserver-barrier-warning.patch
committer Amy Winston <amynka@gentoo.org> 2016-06-06 16:03:52 (GMT) commit 1a5da76efe78891df3fac92e70142c2460f260d1 sys-cluster/util-vserver: setattr repaired bug #583892 Thanks :))