Re: [PATCH 2/3] tcp: Reduce SYN resend delay if a suspicous ACK is received

On 1/31/20 2:11 PM, Neal Cardwell wrote:

I looked into fixing this, but my quick reading of the Linux tcp_rcv_state_process() code is that it should behave correctly and that a connection in FIN_WAIT_1 that receives a FIN/ACK should move to TIME_WAIT.

SeongJae, do you happen to have a tcpdump trace of the problematic sequence where the "process A" ends up in FIN_WAIT_2 when it should be in TIME_WAIT?

If I have time I will try to construct a packetdrill case to verify the behavior in this case.

Unfortunately you wont be able to reproduce the issue with packetdrill, since it involved packets being processed at the same time (race window)