D19468.diff
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	Index: head/sys/net/iflib.c
	===================================================================
	--- head/sys/net/iflib.c
	+++ head/sys/net/iflib.c
	@@ -3276,9 +3276,14 @@
	txq->ift_mbuf_defrag++;
	m_head = m_defrag(*m_headp, M_NOWAIT);
	}
	- remap++;
	- if (__predict_false(m_head == NULL))
	+ /*
	+ * remap should never be >1 unless bus_dmamap_load_mbuf_sg
	+ * failed to map an mbuf that was run through m_defrag
	+ */
	+ MPASS(remap <= 1);
	+ if (__predict_false(m_head == NULL \|\| remap > 1))
	goto defrag_failed;
	+ remap++;
	*m_headp = m_head;
	goto retry;
	break;