tcp: fix TFO SYNACK undo to avoid double-timestamp-undo
In a rare corner case the new logic for undo of SYNACK RTO could result in triggering the warning in tcp_fastretrans_alert() that says: WARN_ON(tp->retrans_out != 0); The warning looked like: WARNING: CPU: 1 PID: 1 at net/ipv4/tcp_input.c:2818 tcp_ack+0x13e0/0x3270 The sequence that tickles this bug is: - Fast Open server receives TFO SYN with data, sends SYNACK - (client receives SYNACK and sends ACK, but ACK is lost) - server app sends some data packets - (N of the first data packets are lost) - server receives client ACK that has a TS ECR matching first SYNACK, and also SACKs suggesting the first N data packets were lost - server performs TS undo of SYNACK RTO, then immediately enters recovery - buggy behavior then performed a *second* undo that caused the connection to be in CA_Open with retrans_out != 0 Basically, the incoming ACK packet with SACK blocks causes us to first undo the cwnd reduction from the SYNACK RTO, but then immediately enters fast recovery, which then makes us eligible for undo again. And then tcp_rcv_synrecv_state_fastopen() accidentally performs an undo using a "mash-up" of state from two different loss recovery phases: it uses the timestamp info from the ACK of the original SYNACK, and the undo_marker from the fast recovery. This fix refines the logic to only invoke the tcp_try_undo_loss() inside tcp_rcv_synrecv_state_fastopen() if the connection is still in CA_Loss. If peer SACKs triggered fast recovery, then tcp_rcv_synrecv_state_fastopen() can't safely undo. Fixes: 794200d6 ("tcp: undo cwnd on Fast Open spurious SYNACK retransmit") Signed-off-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NYuchung Cheng <ycheng@google.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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