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netstack: revert SND.NXT when purging the write queue
There are only 3 places we remove from the write queue. The other two are fairly self-contained and don't look suspicious. They are: - tcp.sender.maybeSendSegment - removes iff the segments are merged - tcp.sender.handleRcvdSegment - removes iff the whole segment is covered by an incoming ACK Given that the panic occurs when the write queue is empty and SND.NXT != SND.UNA, the bug likely occurs when either the writeList removes a segment or SND.NXT increments. PiperOrigin-RevId: 698885878
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