RHEL7.5 / RHEL8.0 NFSv3 or lockd reconnect shows "double SYN" or immediate 3-way teardown after successful 3-way handshake.

Issue

• We are experiencing a NFS v3 lockd duplicate SYN that looks related to solutions 3765711 and 3742871 which states: The issue 1660784 has been resolved with errata RHSA-2019:0163 with the following package(s): kernel-3.10.0-957.5.1.el7 or later.
• We updated to kernel 3.10.0-957.10.1 from 3.10.0-1.957.3.el7 and that is when we starting having this intermittent issue.
• Only have seen this on RHEL 7.6 client to ISILON NFS servers after we updated from Kernel 3.10.0-957.1.3 to 3.10.0-957.10.1. Before this update, the client might send an RST in the middle of connection setup but we could recover from that.
• We cannot reproduce it at will / it does not always send a duplicate SYN .. and now we keep the session alive
• I did notice in one of my older traces that if the client tore down the connection after 5 minute of idle time then the next lockd request would create the session ; but if the Isilon tore down the connection then that is when the client would send the duplicate SYN packets and we would never recover after that.