I have enabled PREEMPTION, FULL_PREEMPTION with ULE. Now I get strange result here:

• propagate_priority gets a TD_ON_LOCK(td)
• It tries to panic(), unfortunatelly, ts->ts_lockobj here is NULL
• A fatal trap 12 happens.

It seems that ts->ts_lockobj was touched by sched_lend_prio, for unknown reasons. Maybe there is some lock releases?