The os_log_create API documents that the logging subsystem will maintain a global list of logs, and will return existing logs for subsequent calls for the same category and subsystem, so we don't need to maintain our own log. This also avoids a crash were we would end up in the logging backend during application shutdown, when destructor functions run, for example via QLibraryStore::cleanup(). In this case local static such as our log cache had already been destroyed, leading to use after free. Pick-to: 6.2 6.3 5.15 Change-Id: I91abfef6c56f8ca6dd8d602ac83aa163ce3d6860 Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io> Reviewed-by: Marc Mutz <marc.mutz@qt.io>