[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: Fri, 30 Sep 2022 15:21:42 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264257

--- Comment #112 from Richard Scheffenegger <rscheff@freebsd.org> ---
(In reply to Christos Chatzaras from comment #111)
Yes, this is very likely - the "fix offset" patch addresses the problematic
sequence of events, leading to this off-by-one calculation. 

MAIN: https://reviews.freebsd.org/rG6d9e911fbadf3b409802a211c1dae9b47cb5a2b8
STABLE-13:
https://reviews.freebsd.org/rG0612d3000b974f31de15c90c77bf43f121fc8656
STABLE-12:
https://reviews.freebsd.org/rG26370413d43bfd65500270ff331ae6bdf0f54133

The change is effectively identical, in all variants.

(Without the other two fixes, the exact timing of packets being sent may not
fully conform to TCP specs, but this doesn't materially impact stability or
consistency at all).

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