static void perf_output_read(struct perf_output_handle *handle,
			     struct perf_event *event)
{
	u64 enabled = 0, running = 0, now;
	u64 read_format = event->attr.read_format;

	/*
	 * compute total_time_enabled, total_time_running
	 * based on snapshot values taken when the event
	 * was last scheduled in.
	 *
	 * we cannot simply called update_context_time()
	 * because of locking issue as we are called in
	 * NMI context
	 */
	if (read_format & PERF_FORMAT_TOTAL_TIMES)
		calc_timer_values(event, &now, &enabled, &running);

	if (event->attr.read_format & PERF_FORMAT_GROUP)
		perf_output_read_group(handle, event, enabled, running);
	else
		perf_output_read_one(handle, event, enabled, running);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.