open-iscsi package errors (iscsid, "can not create NETLINK_ISCSI socket")

Hi guys,

I've been seeing some minor-but-annoying errors lately from iscsi when interacting with apt:

Setting up open-iscsi (2.0.873+git0.3b4b4500-14ubuntu3.2) ...
Job for iscsid.service failed because a configured resource limit was exceeded. See "systemctl status iscsid.service" and "journalctl -xe" for details.
invoke-rc.d: initscript iscsid, action "restart" failed.
dpkg: error processing package open-iscsi (--configure):
 subprocess installed post-installation script returned error exit status 1

The underlying error is:

Dec 05 16:13:07 nettle iscsid[13987]: iSCSI logger with pid=13990 started!
Dec 05 16:13:07 nettle systemd[1]: iscsid.service: Failed to read PID from file 
Dec 05 16:13:07 nettle iscsid[13990]: iSCSI daemon with pid=13991 started!
Dec 05 16:13:07 nettle systemd[1]: iscsid.service: Daemon never wrote its PID fi
Dec 05 16:13:07 nettle iscsid[13990]: can not create NETLINK_ISCSI socket
Dec 05 16:13:07 nettle systemd[1]: Failed to start iSCSI initiator daemon (iscsi)

Can't put my finger right on when it started - it was a recent set of updates. Anyone know a quick fix?