[Bug 253848] panic: sackhint bytes rtx >= 0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253848

--- Comment #2 from Richard Scheffenegger <rscheff at freebsd.org> ---
Some more peculiar observations:

T_dupacks is 4 .. so this appears to be the 2nd ack, where we should be
responding with more data to.

At t_dupacks 3, SACK should have retransmitted only the first packet.

However, the two holes (sackhint.nexthole for the final one, and *cur for the
previous one, which we know is the first, as snd_una == cur->start ) both claim
to have been retransmitted already (->rxmit == ->end), for a total of 4
segments...

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