Has anyone tried the following lately? echo 1 > /sys/kernel/debug/tracing/events/hist/preemptirqsoff_hist This will crash my system immediately (back to BIOS POST). Christoph -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html