[FS#3649] Software flow offloading breaks IPv6 policy-based routing (traffic leak)

[OpenWrt Bugs]

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User who did this - LGA1150 (LGA1150) 

Attached to Project - OpenWrt/LEDE Project
Summary - Software flow offloading breaks IPv6 policy-based routing (traffic leak)
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I use ip6tables MARK and iproute2 rule to forward certain traffic to a WireGuard VPN interface.
When software flow offloading is on, IPv6 traffic over VPN no longer works, but IPv4 works fine.
A tcpdump check shows that offloaded IPv6 packets are routed by the main routing table instead of the one specified in ip -6 rule.

Both 5.4 and 5.10 kernel version have this issue.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3649

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