The "cpu" field of trace entries processed by rtla in tracefs mode is used as an index into an array of size nr_cpus. In case the cpu numbers mismatch because either the kernel or rtla reporting the number incorrectly, out-of-bounds read/write may occur. Guard against this by dropping trace entries with cpu >= nr_cpus in collect_registered_events(). A new counter, "invalid_events", is added to struct trace_instance, and printed (if non zero) next to the pre-existing missed events counter. Link: https://lore.kernel.org/r/20260814135511.2207190-3-tglozar@redhat.com Signed-off-by: Tomas Glozar <tglozar@redhat.com>