gistfile1.txt

Failing RubySpec:
/Users/brandon/Projects/rubyspec/language/versions/next_1.8.rb:3: [BUG] rb_gc_mark(): unknown data type 0x30(0x7fff5fbf1be0) non object

(gdb) bt 10
#0  0x00007fff85437616 in __kill ()
#1  0x00007fff854d7cca in abort ()
#2  0x000000010001899d in rb_bug (fmt=Could not find the frame base for "rb_bug".
) at error.c:213
#3  0x00000001000451b2 in gc_mark_children (ptr=140734799748064) at gc.c:2113
#4  0x000000010004491d in rb_gc_mark (ptr=140734799748064) at gc.c:1853
#5  0x0000000100044781 in mark_entry (key=20306, value=140734799748064) at gc.c:1774
#6  0x00000001000aca2e in st_foreach (table=0x101ca1010, func=0x100044768 <mark_entry>, arg=0) at st.c:509
#7  0x00000001000447b0 in rb_mark_tbl (tbl=0x101ca1010) at gc.c:1783
#8  0x000000010004507a in gc_mark_children (ptr=4298114160) at gc.c:2070
#9  0x000000010004491d in rb_gc_mark (ptr=4298114160) at gc.c:1853

... (skip up to #3)

(gdb) print obj
$1 = (RVALUE *) 0x7fff5fbf1be0

// 0x3f is T_MASK
(gdb) print obj->as.basic.flags & 0x3f  
$2 = 48

(gdb) print obj->as.basic.klass
$3 = 4295144094

... hexify

(gdb) x/10 0x10002b29e
0x10002b29e <rb_call+647>:	0x98458948	0x98458b48	0x4855c3c9	0x8348e589
0x10002b2ae <rb_apply+6>:	0x894850ec	0x8948d87d	0x8948d075	0x8b48c855
0x10002b2be <rb_apply+22>:	0x0d7d6d05	0x108b4800	0xf8558948	0x8b48d231