One of the most simple ways to deal with it is that if you have, for example, a six-month visitor visa, you should report to an immigration office or service and identify yourself as still being in Canada or not being in Canada. Or, if your time has expired, you may have been deemed to have overstayed, and you would put on the list that you are subject to removal.
People don't come in and expect to be simply in Canada without any documentation. Some people might consider that—