During our testing we saw:

    [junit4] === Meet Not Symmetric ===
    [junit4] t = stable:narrowoop: org/apache/lucene/util/fst/Builder$Arc:TopPTR *,iid=top (inline_depth=InlineDepthTop)[int:max..0]:AnyNull:exact *,iid=top (inline_depth=-8)
    [junit4] this= stable:narrowoop: java/lang/Object:TopPTR *,iid=top (inline_depth=InlineDepthTop)[int:0]<ciObjArray length=0 type=<ciObjArrayKlass name=[Ljava/lang/Object; ident=885 address=0x00007f227840b8f0> ident=886 SCAVENGABLE
 address=0x00007f227840b9a0> *,iid=top (inline_depth=InlineDepthTop)
    [junit4] mt=(t meet this)= stable:narrowoop: org/apache/lucene/util/fst/Builder$Arc:TopPTR *,iid=top (inline_depth=InlineDepthTop)[int:0]:NotNull *
    [junit4] t_dual= narrowoop: org/apache/lucene/util/fst/Builder$Arc *[int:>=0]:NotNull:exact * (inline_depth=8)
    [junit4] this_dual= narrowoop: java/lang/Object *[int:0]<ciObjArray length=0 type=<ciObjArrayKlass name=[Ljava/lang/Object; ident=885 address=0x00007f227840b8f0> ident=886 SCAVENGABLE address=0x00007f227840b9a0> *
    [junit4] mt_dual= narrowoop: org/apache/lucene/util/fst/Builder$Arc *[int:0]:AnyNull *,iid=top (inline_depth=InlineDepthTop)
    [junit4] mt_dual meet t_dual= narrowoop: org/apache/lucene/util/fst/Builder$Arc *[int:>=0]:NotNull:exact * (inline_depth=8)
    [junit4] mt_dual meet this_dual= narrowoop: java/lang/Object *[int:0]:NotNull *
    [junit4] # To suppress the following error report, specify this argument
    [junit4] # after -XX: or in .hotspotrc: SuppressErrorAt=/type.cpp:713
    [junit4] #
    [junit4] # A fatal error has been detected by the Java Runtime Environment:
    [junit4] #
    [junit4] # Internal Error (/mnt/ramdisk/openjdk/hotspot/src/share/vm/opto/type.cpp:713), pid=18197, tid=0x00007f22a55e3700
    [junit4] # fatal error: meet not symmetric