Uninitialized scalar field
The field will contain an arbitrary value left over from earlier computations. A scalar field is not initialized by the constructor
/src/mongo/db/pipeline/document_source_set_window_fields.h:140: UNINIT_CTOR 117876 Class member declaration for "_maxMemory".
/src/mongo/db/pipeline/document_source_set_window_fields.h:98: UNINIT_CTOR 117876 Non-static class member "_maxMemory" is not initialized in this constructor nor in any functions that it calls.