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1. kernel don't have tracefs and debugfs (no it doesn't trigger tombstoned. process handled and exit cleanly)
2. cgroup uid_100 invalid argument is because the referenced process by android is being killed when it tries to access, so it no longer valid at that time. normal.
3. slmk is killing on boot. normal. if it doesn't kill, the boot will be very slowwwww and can stuck.