[ruby-core:24172] [Bug #1737] Enumerable#join: Segfault Resulting from Recent Commit

Bug #1737: Enumerable#join: Segfault Resulting from Recent Commit
http://redmine.ruby-lang.org/issues/show/1737

Author: Run Paint Run Run
Status: Open, Priority: Normal
Assigned to: Nobuyoshi Nakada
ruby -v: ruby 1.9.2dev (2009-07-07 trunk 23976) [i686-linux]

It looks like one of yesterday's commits is causing a segfault. Yesterday this code exposed bug #1731, but didn't segfault, so presumably either the fix or another commit made in the meantime is the cause. Possibly r23966?

Unfortunately, I'm so far unable to reduce it to a reasonable test case that doesn't rely on mspec (http://github.com/rubyspec/mspec/tree/master). Is this enough for you to work magic, nobu? :-) If not, I'll try to untangle this from mspec tomorrow and provide a better example.

    $ cat /tmp/enum_join_segfault.rb 
    require 'mspec/mocks/object'
    class Enum
      include Enumerable

      def each
        yield 1
        yield 2
      end
    end
    Enum.new.join(mock('e'))

    $ ruby -v /tmp/enum_join_segfault.rb 
    ruby 1.9.2dev (2009-07-07 trunk 23976) [i686-linux]
    /tmp/enum_join_segfault.rb:7: [BUG] Segmentation fault
    ruby 1.9.2dev (2009-07-07 trunk 23976) [i686-linux]

    -- control frame ----------
    c:0007 p:---- s:0018 b:0018 l:000009 d:000017 IFUNC  :require
    c:0006 p:0017 s:0016 b:0015 l:000014 d:000014 METHOD /tmp/enum_join_segfault.rb:7
    c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
    c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :join
    c:0003 p:0052 s:0006 b:0006 l:0012b4 d:001ba4 EVAL   /tmp/enum_join_segfault.rb:10
    c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
    c:0001 p:0000 s:0002 b:0002 l:0012b4 d:0012b4 TOP   
    ---------------------------
    /tmp/enum_join_segfault.rb:10:in `<main>'
    /tmp/enum_join_segfault.rb:10:in `join'
    /tmp/enum_join_segfault.rb:7:in `each'

    -- C level backtrace information -------------------------------------------
    ruby(rb_vm_bugreport+0xb5) [0x8161c15]
    ruby [0x819d38b]
    ruby(rb_bug+0x28) [0x819d418]
    ruby [0x80f69b5]
    [0xb8004410]
    ruby [0x810a9da]
    ruby(rb_str_buf_append+0x5b) [0x810aa6b]
    ruby [0x8199dc7]
    ruby [0x8151909]
    ruby [0x81570c7]
    ruby [0x8159462]
    ruby [0x815ba85]
    ruby [0x815bf8c]
    ruby [0x815f551]
    ruby(rb_iterate+0x128) [0x814dcf8]
    ruby(rb_block_call+0x3f) [0x814dd9f]
    ruby [0x8198855]
    ruby [0x814db4d]
    ruby [0x815fcbb]
    ruby [0x8152776]
    ruby [0x8159462]
    ruby(rb_iseq_eval_main+0x1a3) [0x81596d3]
    ruby(ruby_exec_node+0x97) [0x805d467]
    ruby(ruby_run_node+0x46) [0x805ed36]
    ruby(main+0x60) [0x805c860]
    /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7e25775]
    ruby [0x805c761]

    [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

    Aborted


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