Currently Qt manages the lifetime of QTextCodecs, according to the documentation. If user wants to implement his own codec and that implementation is located in a plugin, when the application is shutting down and plugin is unloaded before the codecs are deleted, it causes a crash.

Unloading the plugin could count as a deleting the QTextCodec by user which is against the documentation, but there are cases where the main application's code should not be bloated with plugin specific code that the QTextCodec could be. Maybe there could be a way to unregister the specific codecs?