[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 #10 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Franck Rousseau from comment #9)
> 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.

No, without NET_EPOCH the patch won't work. It is the main feature that allows
to fix the problem and 11.x has not this feature.

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