[Bug 263445] [tcp] Fatal trap 12: page fault while in kernel mode // supervisor read data, page not present // 13.1-RC3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263445

--- Comment #9 from Michael Tuexen <tuexen@freebsd.org> ---
(In reply to Richard Scheffenegger from comment #8)
Hi Richard,

I'm looking at the tracefile provided by Igor and see:

(kgdb) f 10
#10 0xffffffff80dd7eed in tcp_do_segment (m=<optimized out>, th=<optimized
out>, so=<optimized out>, tp=0xfffffe025fb86518, drop_hdrlen=52,
    tlen=<optimized out>, iptos=0 '\000') at
/usr/src/sys/netinet/tcp_input.c:2637
2637                                            (void)
tp->t_fb->tfb_tcp_output(tp);
(kgdb) p tp->t_state
$10 = 6
(kgdb) p *tp->sackhint.nexthole
$11 = {start = 1529400226, end = 1529409856, rxmit = 1529409855, scblink =
{tqe_next = 0x0, tqe_prev = 0xfffffe025fb86658}}
(kgdb)

Do you really see 8 as the state (which is TCPS_LAST_ACK)? I see 6 (which is
TCPS_FIN_WAIT_1).

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