Transparent proxy hangs after kernel update to 4.15.6-200.fc26.x86_64

Long running stable router box (FC26), tor transparent proxy has been working great for years. Tor now crashes and hangs when application attempts to connect through transparent proxy (TransProxy 9040) etc:

ps -auxf | grep toranon

toranon 2479 0.1 0.2 80920 34640 ? Ds 19:45 0:00 /usr/bin/tor --runasdaemon 0 --defaults-torrc /usr/share/tor/defaults-torrc -f /etc/tor/torrc

Attempted to downgrade tor back to 0.2.9.10 with dnf... No joy.

Attempted to downgrade openssl to 1.1.0f-4... No joy

When I attempt to connect, say with curl, the last 2 lines in debug.log are:

Mar 11 20:06:20.000 [debug] connection_add_impl(): new conn type Socks, socket 16, address 172.16.111.3, n_conns 7. Mar 11 20:06:20.000 [debug] connection_ap_process_transparent(): entered.

curl hangs, tor hangs (STATUS Ds), have to reboot to clear it.

Suggestions welcome.

Trac:
Username: freerj