[FS#1541] Invalid Kernel logspam : sit: non-ECT from <various IPs, Invalid IPs>

[LEDE Bugs]

The following task has a new comment added:

FS#1541 - Invalid Kernel logspam : sit: non-ECT from 
User who did this - Arjen de Korte (arjendekorte)

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FWIW, I see this too. About two weeks ago this started. Fortunately, I still have a build available that is not affected, so I'll dig in next week to see what is the culprit. I guess it is something related to OpenVPN/routing, since I can no longer tunnel IPv6 over an IPv4 OpenVPN connection.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1541#comment4709