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diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
--- a/sys/netinet/tcp_output.c
+++ b/sys/netinet/tcp_output.c
@@ -338,10 +338,10 @@
len = ((int32_t)ulmin(cwin,
SEQ_SUB(p->end, p->rxmit)));
}
- off = SEQ_SUB(p->rxmit, tp->snd_una);
- KASSERT(off >= 0,("%s: sack block to the left of una : %d",
- __func__, off));
if (len > 0) {
+ off = SEQ_SUB(p->rxmit, tp->snd_una);
+ KASSERT(off >= 0,("%s: sack block to the left of una : %d",
+ __func__, off));
sack_rxmit = 1;
sendalot = 1;
TCPSTAT_INC(tcps_sack_rexmits);

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