[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 #9 from Franck Rousseau <Franck.Rousseau at imag.fr> ---
Thanks for the tentative fix, I have just tested on 11.2 and 12-RC1 kernels. I
have adapted to 11.2 by removing the NET_EPOCH_* macros. The behavior changes,
there is no more crash, but it looks like something is not cleared as it
should.

Setting up ppp + proxy arp, everything works. Then, interrupting and restarting
ppp used to cause the crash consistently, but with this patch, ppp fails with
the following error :

    PPp ON localhost> Warning: iface add: ioctl(SIOCAIFADDR, 192.168.0.2 ->
192.168.0.1): File exists
    Error: ipcp_InterfaceUp: unable to set ip address 

Sorry, I don't have much time to dig into the route and interface handling code
right now.

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