diff --git a/tailnet/configmaps.go b/tailnet/configmaps.go
index 028ba7dfff..2a2266913b 100644
--- a/tailnet/configmaps.go
+++ b/tailnet/configmaps.go
@@ -137,6 +137,7 @@ func (c *configMaps) configLoop() {
 			c.Wait()
 		}
 		if c.closing {
+			c.logger.Debug(context.Background(), "closing configMaps configLoop")
 			return
 		}
 		// queue up the reconfiguration actions we will take while we have
@@ -146,12 +147,14 @@ func (c *configMaps) configLoop() {
 		if c.derpMapDirty {
 			derpMap := c.derpMapLocked()
 			actions = append(actions, func() {
+				c.logger.Debug(context.Background(), "updating engine DERP map", slog.F("derp_map", derpMap))
 				c.engine.SetDERPMap(derpMap)
 			})
 		}
 		if c.netmapDirty {
 			nm := c.netMapLocked()
 			actions = append(actions, func() {
+				c.logger.Debug(context.Background(), "updating engine network map", slog.F("network_map", nm))
 				c.engine.SetNetworkMap(nm)
 				c.reconfig(nm)
 			})
@@ -159,6 +162,7 @@ func (c *configMaps) configLoop() {
 		if c.filterDirty {
 			f := c.filterLocked()
 			actions = append(actions, func() {
+				c.logger.Debug(context.Background(), "updating engine filter", slog.F("filter", f))
 				c.engine.SetFilter(f)
 			})
 		}
diff --git a/tailnet/node.go b/tailnet/node.go
index 5b00367ebb..8f7810f80a 100644
--- a/tailnet/node.go
+++ b/tailnet/node.go
@@ -52,6 +52,7 @@ func (u *nodeUpdater) updateLoop() {
 			u.Wait()
 		}
 		if u.closing {
+			u.logger.Debug(context.Background(), "closing nodeUpdater updateLoop")
 			return
 		}
 		node := u.nodeLocked()
@@ -68,6 +69,7 @@ func (u *nodeUpdater) updateLoop() {
 		}
 
 		u.L.Unlock()
+		u.logger.Debug(context.Background(), "calling nodeUpdater callback", slog.F("node", node))
 		u.callback(node)
 		u.L.Lock()
 	}
@@ -126,6 +128,8 @@ func (u *nodeUpdater) setNetInfo(ni *tailcfg.NetInfo) {
 	if u.preferredDERP != ni.PreferredDERP {
 		dirty = true
 		u.preferredDERP = ni.PreferredDERP
+		u.logger.Debug(context.Background(), "new preferred DERP",
+			slog.F("preferred_derp", u.preferredDERP))
 	}
 	if !maps.Equal(u.derpLatency, ni.DERPLatency) {
 		dirty = true