K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2020-01-23T03:36:50.610868Z
K 7
svn:log
V 270
Block the thread lock in sched_throw() and use cpu_switch() to unblock
it.  The introduction of lockless switch in r355784 created a race to
re-use the exiting thread that was only possible to hit on a hypervisor.

Reported/Tested by:	rlibby
Discussed with:	rlibby, jhb

END