[Bug 224479] kernel panic in reboot+swapoff sys call

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224479

--- Comment #22 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Conrad Meyer from comment #20)
Because we do not enforce a policy in the kernel on the possible md(4) usage.

Even assuming that we do, we would need
(a) teach VFS to see through md(4) to understand the usages for the files
(b) call swap_pager_swapoff() while VFS flushes vnodes.
Both are intolerable layering violations, see the reference to 'policy' above.

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