[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

Andrey V. Elsukov <ae at FreeBSD.org> changed:

           What    |Removed                     |Added
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 Attachment #199444|0                           |1
        is obsolete|                            |

--- Comment #17 from Andrey V. Elsukov <ae at FreeBSD.org> ---
Created attachment 199449
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199449&action=edit
Proposed patch

I think this patch can be used for both FreeBSD 12 and 11. Use
IFNET_RLOCK_NOSLEEP() to protect from interface destroying during routes
iteration. In if_detach_internal() mark interface as dying just after we remove
it from the ifnets list. In sysctl_dumpentry() add the check, that interface
was not destroyed before doing the access.

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