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

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

--- Comment #11 from Konstantin Belousov <kib at FreeBSD.org> ---
I do not quite understand what a cause for the complain is.  If the system
cannot get the swapped out page data on swapoff, this means that the data is
corrupted.  Preventing further user data corruption by panicing is a normal
reaction.

In the case of the swap file on the unmounted filesystem, this is expected mode
of failure.  Unmount reclaims the vnode, making all io to fail, putting the
system into situation described in the previous paragraph.

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