kern/207069 update with patch

I finally got my way through forth and to the point where I have a working patch; updated ticket with patch and included the testing I had completed. 2 line patch, should be very straightforward to someone familiar with that code. Thanks ___ freebsd-stab

10.2 - Process stuck in unkillable sleep

Occasionally we see a process get stuck in an unkillable state and the only solution is a hard reboot. Occasionally == once every two weeks across 60+ servers, which are spread across the globe in customer sites. We have no remote access to these boxes. The process that most often that gets stu