static void perf_event_free_bpf_handler(struct perf_event *event)
{
	struct bpf_prog *prog = event->prog;

	if (!prog)
		return;

	WRITE_ONCE(event->overflow_handler, event->orig_overflow_handler);
	event->prog = NULL;
	bpf_prog_put(prog);
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.