static struct ip_options *ip_options_get_alloc(const int optlen)
{
	return kzalloc(sizeof(struct ip_options) + ((optlen + 3) & ~3),
		       GFP_KERNEL);
}
The program contains a code sequence that can run concurrently with other code, and the code sequence 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 that is operating concurrently.