The following error is occurring during stress testing; space failure: 0x0063006c No special case for space in traceObject vm internal error at: – Stack – at Lorg/jikesrvm/VM; _assertionFailure(Ljava/lang/String;Ljava/lang/String;)V at line 535 at Lorg/jikesrvm/VM; _assert(ZLjava/lang/String;Ljava/lang/String;)V at line 518 at Lorg/jikesrvm/VM; _assert(Z)V at line 496 at Lorg/jikesrvm/mm/mmtk/Assert; _assert(ZLjava/lang/String;)V at line 83 at Lorg/mmtk/plan/TraceLocal; traceObject(Lorg/vmmagic/unboxed/ObjectReference;)Lorg/vmmagic/unboxed/ObjectReference; at line 259 at Lorg/mmtk/plan/generational/GenMatureTraceLocal; traceObject(Lorg/vmmagic/unboxed/ObjectReference;)Lorg/vmmagic/unboxed/ObjectReference; at line 109 Here are some example test cases where it has happened; http://jikesrvm.anu.edu.au/cattrack/results/rvmx86lnx32.anu.edu.au/stress.391/gcstress/Opt_1/dacapo/jython/Output.txt http://jikesrvm.anu.edu.au/cattrack/results/rvmx86lnx32.anu.edu.au/stress.391/gcstress/Opt_1/dacapo/jython/Output.txt