D2609.id5528.diff
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	Index: sys/dev/sfxge/sfxge_tx.c
	===================================================================
	--- sys/dev/sfxge/sfxge_tx.c
	+++ sys/dev/sfxge/sfxge_tx.c
	@@ -865,8 +865,14 @@
	tso->seqnum = ntohl(th->th_seq);

	/* These flags must not be duplicated */
	- KASSERT(!(th->th_flags & (TH_URG \| TH_SYN \| TH_RST)),
	- ("incompatible TCP flag on TSO packet"));
	+ /*
	+ * RST should not be duplicated as well, but FreeBSD kernel
	+ * generates TSO packets with RST flag. So, do not assert
	+ * its absence.
	+ */
	+ KASSERT(!(th->th_flags & (TH_URG \| TH_SYN)),
	+ ("incompatible TCP flag 0x%x on TSO packet",
	+ th->th_flags & (TH_URG \| TH_SYN)));

	tso->out_len = mbuf->m_pkthdr.len - tso->header_len;
	}