I tried to fix that by:
commit bc2ac71c
Author: Andrey Vagin <avagin@openvz.org>
Date:   Wed Sep 12 15:16:39 2012 +0400

    sk-unix: don't add a socket in a second time

but made a mistake and now a peer would be added only if it's in a list.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>