[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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #60 from Richard Scheffenegger <rscheff@freebsd.org> ---
(In reply to Christos Chatzaras from comment #57)

Sorry for being unclear:

A plain (unpatched) 13.1-RELEASE kernel with net.inet.tcp.rfc6675_pipe=0 would
not exhibit a panic.

The patches added here really are to gather more information - and deliberately
panic (when built with INVARIANTS) or retroactively adjust the incorrect TCP
state.

Stable operation in a production environment would only need the standard
kernel, and it's safe to use SACK as long as rfc6675_pipe is not enabled.

(The root cause - apparent double-accounting for FIN bits, and possibly even
sending FIN bits at two different, final sequence numbers - would still be
present, but not cause a crash).

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