From: Magnus Holm <redmine@...>
Date: 2010-11-23T00:21:50+09:00
Subject: [ruby-core:33289] [Ruby 1.9-Bug#4082][Open] Segfault with tailcall_optimization and class definition

Bug #4082: Segfault with tailcall_optimization and class definition
http://redmine.ruby-lang.org/issues/show/4082

Author: Magnus Holm
Status: Open, Priority: Normal
ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]

Code:

    RubyVM::InstructionSequence.compile_option = {
      :tailcall_optimization => true,
      :trace_instruction => false
    }

    RubyVM::InstructionSequence.new(<<-EOF).eval
      class Foo
        def fact_helper(n, res)
          if n == 1
            res
          else
            fact_helper(n - 1, n * res)
          end
        end
        
        def fact(n)
          fact_helper(n, 1)
        end
      end
    EOF

    p Foo.new.fact(30000)

Error:

    <compiled>:6: [BUG] Segmentation fault
    ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]

    -- control frame ----------
    c:0004 p:0031 s:0014 b:0011 l:000010 d:000010 METHOD <compiled>:6
    c:0003 p:0078 s:0007 b:0006 l:001588 d:001e68 EVAL   -:22
    c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
    c:0001 p:0000 s:0002 b:0002 l:001588 d:001588 TOP   
    ---------------------------
    -- Ruby level backtrace information ----------------------------------------
    -:22:in `<main>'
    <compiled>:6:in `fact_helper'

    -- C level backtrace information -------------------------------------------

    [NOTE]
    You may have encountered a bug in the Ruby interpreter or extension libraries.
    Bug reports are welcome.
    For details: http://www.ruby-lang.org/bugreport.html

    Abort trap


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