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diff --git a/sys/net/if.c b/sys/net/if.c
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -2183,6 +2183,14 @@
if (ifp->if_link_state == link_state)
return;
+ /*
+ * if_detach_internal() drains the taskqueue_swi from the
+ * events from this ifnet. Maintain the invariant by
+ * refusing any changes after the interface was unlinked.
+ */
+ if (ifp->if_flags & IFF_DYING)
+ return;
+
ifp->if_link_state = link_state;
/* XXXGL: reference ifp? */

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