Originally Posted by wackyflyer

Most countries have rules (by international agreement) about revoking citizenship unless you have dual citizenship as it renders you stateless.

this happens occasionally now when individuals head off to fight with terror groups, and the country they left from doesn’t want them back for obvious reasons.

United Nations High Commissioner for Refugees has established rules on how UN member countries manage stateless individuals (refugees or not). Given Pakistan is a UN member state it in theory has obligations, though hard to enforce perhaps. They have a website if you need support.

In a sense with respect to the passport in the original post, it is still a form of identity and my be used to identify one self, but would have no validity as a travel document to be be granted entry into any country.