I have just checked in a fix that makes swapping work again.

From the commit message:
> By accident, a previously unused bit in the PTE got used as wired bit.
> Because of this kvtophys() of wired pages did set the leftmost bit, causing
> the pager to hang while swapping. This is now fixed by using another
> free bit in the PTE as wired bit instead.
> This fixes PR#11121.
> 
> Many thanks to Chuck Silvers that found what the problem was!

A pullup request for 1.5 is sent.

-- Ragge