Hi, in my kaffe port sometimes the assertion "GETREF(obj->ref) == (uintp)obj" failed: file "gc-incremental.c", line 301 is triggered (for instance after Thrd2 was running a while). Am I right when I think, that this assertion occurs, if the gc thread was interrupted in work? Frank Frank Mehnert email: Frank.Mehnert at mchp.siemens.de