[Bug 202420] Unmount Of Swap Files At Reboot Fails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202420

            Bug ID: 202420
           Summary: Unmount Of Swap Files At Reboot Fails
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tundra at tundraware.com

If a swapfile has been mounted (as opposed to a swap partition on the disk),
when attempting to reboot, the system panics, complaining about not being able
to read a block of swap data and then hangs.

This is an issue for servers being rebooted where no one is watching the
console and we don't find out the server never came back up until an alarm goes
off.

It seems that the reboot logic should at least try to quiesce and flush
auxiliary swap before actually resetting the machine.

This may be relevant also to Bug #187081.

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