Index: sys/dev/nvme/nvme_qpair.c
===================================================================
--- sys/dev/nvme/nvme_qpair.c
+++ sys/dev/nvme/nvme_qpair.c
@@ -513,7 +513,17 @@
 			    "cpl does not map to outstanding cmd\n");
 			/* nvme_dump_completion expects device endianess */
 			nvme_dump_completion(&qpair->cpl[qpair->cq_head]);
-			KASSERT(0, ("received completion for unknown cmd\n"));
+			/*
+			 * If we're panicing, or we've stopped the sceudler just
+			 * before we panic, don't assert consistency. We can
+			 * arbitrarily interrupt other threads on panic, leading
+			 * the qpair structure in an inconsistent state when we
+			 * poll to complete the dumping I/O. This inconsistency is
+			 * detected by the KASSERT bogusly, preventing a dump
+			 * from completing while in this state.
+			 */
+			if (!(dumping || SCHEDULER_STOPPED()))
+				KASSERT(0, ("received completion for unknown cmd\n"));
 		}
 
 		if (++qpair->cq_head == qpair->num_entries) {