Index: sys/net/iflib.c
===================================================================
--- sys/net/iflib.c
+++ sys/net/iflib.c
@@ -1984,7 +1984,8 @@
 			if (fl->ifl_sds.ifsd_map != NULL) {
 				bus_dmamap_t sd_map = fl->ifl_sds.ifsd_map[i];
 				bus_dmamap_unload(fl->ifl_desc_tag, sd_map);
-				bus_dmamap_destroy(fl->ifl_desc_tag, sd_map);
+				if (fl->ifl_rxq->ifr_ctx->ifc_in_detach)
+					bus_dmamap_destroy(fl->ifl_desc_tag, sd_map);
 			}
 			if (*sd_m != NULL) {
 				m_init(*sd_m, M_NOWAIT, MT_DATA, 0);