[Bug 264257] [tcp] Panic: Fatal trap 12: page fault while in kernel mode (if_io_tqg_4) - m_copydata ... at /usr/src/sys/kern/uipc_mbuf.c:659

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 06 Jun 2022 22:00:34 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #20 from Michael Tuexen <tuexen@freebsd.org> ---
(In reply to iron.udjin from comment #19)
OK, thanks for the information.

My current thinking is that the problem might be related to using KTLS in a
situation, where the TCP sends a FIN, but still has outstanding data. KTLS is
tested a lot with the RACK stack, which does NOT send a FIN if there is
outstanding data. This could be the problem with len = 1, since the FIN takes
conceptually one byte in the sequence number space, but there is no
corresponding byte in the data stream...

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