void kvm_arch_sync_events(struct kvm *kvm)
{
	cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
	cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
	kvm_free_all_assigned_devices(kvm);
	kvm_free_pit(kvm);
}

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.