Sorry for this OT, I found a point in kern_switch.c, when choosethread() runs,
you reset kg_last_assigned to NULL, I suspect it is incorrect, should it be:
--- kern_switch.c.orig Sun Jun 2 14:52:24 2002
+++ kern_switch.c Sun Jun 2 14:53:28 2002
@@ -67,7 +67,9 @@
kg = ke->ke_ksegrp;
TAILQ_REMOVE(&kg->kg_runq, td, td_runq);
if (kg->kg_last_assigned == td)
- kg->kg_last_assigned = NULL;
+ kg->kg_last_assigned =
+ TAILQ_PREV(td,
+ threadlist_head, td_runq);
}
CTR2(KTR_RUNQ, "choosethread: td=%p pri=%d",
td, td->td_priority);
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