[Bug 264257] 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 #5 from John Baldwin <jhb@FreeBSD.org> ---
Looks like it walked off the end of the mbuf chain as it tried to copy one byte
too many.  You could try going up to frame 8 (tcp_output) to see if the
arguments passed to m_copydata() are still around (looks like we know the mbuf
chain via m@entry for frame 9, but knowing the original length and offset and
confirming it walked off the end would be good).  You'd have to figure out why
the length was wrong though and that might need more digging in the tp or the
like.

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