Index: sys/kern/kern_lwp.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_lwp.c,v
retrieving revision 1.180
diff -u -p -r1.180 kern_lwp.c
--- sys/kern/kern_lwp.c	2 Oct 2015 16:54:15 -0000	1.180
+++ sys/kern/kern_lwp.c	12 Nov 2015 00:00:18 -0000
@@ -992,9 +992,9 @@ lwp_startup(struct lwp *prev, struct lwp
 		prev->l_ctxswtch = 0;
 	}
 	KPREEMPT_DISABLE(new_lwp);
-	spl0();
 	if (__predict_true(new_lwp->l_proc->p_vmspace))
 		pmap_activate(new_lwp);
+	spl0();
 
 	/* Note trip through cpu_switchto(). */
 	pserialize_switchpoint();