[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 #14 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Franck Rousseau from comment #12)
> 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

Ok, I think the problem with ppp is due to we don't return needed info when
interface isn't UP.

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