[Bug 230498] Fatal trap 12: page fault while in kernel mode in sysctl_dumpentry from sysctl NET_RT_DUMP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230498

--- Comment #12 from Franck Rousseau <Franck.Rousseau at imag.fr> ---
(In reply to Andrey V. Elsukov from comment #10)

Just to clear things up:
- the crash happens both in 11.2 and 12
- the proposed fix breaks ppp

I did more tests with ppp as explained in bug #227720 this morning and noticed
the following:
- if the ppp server has two different addresses on the ethernet and ppp tun
interfaces, everything works fine, I can stop and start ppp without a problem
- if I configure the same address on the ethernet interface as the one set up
on the tun interface, then the next ppp connection works fine, but if I stop
the server, restart and re-open from the client I consistently get a crash

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