static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
{
	list_del(&s->shm_clist);
	ipc_rmid(&shm_ids(ns), &s->shm_perm);
}

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.