When removing the primary iface froma lagg - the mac should update to the mac address of the next iface in the lagg list.
Currently it happens but not to the one that is now the new primary.

To reproduce:

# ifconfig lagg0 create laggport ifp0 laggport ifp1
# ifconfig lagg0 -laggport ifp0
and look at the macs before and after


The problem is that the code mark the next ifp as primary(@lagg_port_lladdr) and then skip updating it because it is primary(@lagg_port_setlladdr).

suggested fix:

diff --git a/sys/net/if_lagg.c b/sys/net/if_lagg.c
index dcd005a..f9e2312 100644
--- a/sys/net/if_lagg.c
+++ b/sys/net/if_lagg.c
@@ -691,22 +691,23 @@ lagg_port_setlladdr(void *arg, int pending)
         * Traverse the queue and set the lladdr on each ifp. It is safe to do
         * unlocked as we have the only reference to it.
         */
+
        for (llq = head; llq != NULL; llq = head) {
                ifp = llq->llq_ifp;
-
                CURVNET_SET(ifp->if_vnet);
-           if (llq->llq_primary == 0) {
-                   /*
-                    * Set the link layer address on the laggport interface.
-                    * if_setlladdr() triggers gratuitous ARPs for INET.
-                    */
-                   error = if_setlladdr(ifp, llq->llq_lladdr,
-                       ETHER_ADDR_LEN);
-                   if (error)
-                           printf("%s: setlladdr failed on %s\n", __func__,
-                               ifp->if_xname);
-           } else
+
+         /*
+          * Set the link layer address on the laggport interface.
+          * if_setlladdr() triggers gratuitous ARPs for INET.
+          */
+         error = if_setlladdr(ifp, llq->llq_lladdr,
+                         ETHER_ADDR_LEN);
+         if (error)
+                 printf("%s: setlladdr failed on %s\n", __func__,
+                                 ifp->if_xname);
+         if (llq->llq_primary) {
                        EVENTHANDLER_INVOKE(iflladdr_event, ifp);
+         }
                CURVNET_RESTORE();
                head = SLIST_NEXT(llq, llq_entries);
                free(llq, M_DEVBUF);