static ssize_t nr_addr_filters_show(struct device *dev,
				    struct device_attribute *attr,
				    char *page)
{
	struct pmu *pmu = dev_get_drvdata(dev);

	return snprintf(page, PAGE_SIZE - 1, "%d\n", pmu->nr_addr_filters);
}

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.