[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 #4 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Eugene Grosbein from comment #3)
> Created attachment 199064 [details]
> add some checks
> 
> Please try this patch and see if it eliminates panics. Apply it:
> 
> cd /usr/src
> patch < /path/to/patch
> 
> Then rebuild and reinstall the kernel.

This patch is not correct way to fix the problem, I think you have not any
guarantee that you acquire the lock at the time when all data is correct.

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