Q:

Which version of ruby is less buggy?

I have recently written some complex ruby script that eventually fails with segfaults in random time and in random places, like nokogiri, mechanize, iconv, timeout. I've tried it under 1.9.1 p 129, 1.8.6 p 369 under windows 7 and 1.8.7 under ubuntu, still the same behavior. Since there are three actual versions (1.8.6, 1.8.7 and 1.9.1) to be downloaded from ruby-lang, which one is the less buggy and what is the reason for maintaining all of them?
Well, I'm not sure what is causing errors, here is a sample dump of error
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:93: [BUG] Segmentation fault
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0031 p:0167 s:0167 b:0163 l:000162 d:000162 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:93
c:0030 p:0111 s:0155 b:0155 l:000154 d:000154 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2353
c:0029 p:0024 s:0147 b:0147 l:000146 d:000146 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2328
c:0028 p:0099 s:0142 b:0142 l:000141 d:000141 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2288
c:0027 p:0050 s:0136 b:0136 l:000898 d:000898 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/response_reader.rb:15
c:0026 p:0021 s:0128 b:0128 l:000127 d:000127 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25
c:0025 p:0067 s:0124 b:0124 l:001788 d:000123 BLOCK  D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:490
c:0024 p:0017 s:0120 b:0120 l:000112 d:000119 BLOCK  D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1120
c:0023 p:0038 s:0118 b:0118 l:000117 d:000117 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2251
c:0022 p:0110 s:0113 b:0113 l:000112 d:000112 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1119
c:0021 p:0097 s:0108 b:0108 l:000107 d:000107 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103
c:0020 p:0513 s:0101 b:0101 l:001788 d:001788 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485
c:0019 p:0170 s:0075 b:0075 l:000074 d:000074 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:413
c:0018 p:0123 s:0066 b:0066 l:000065 d:000065 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:344
c:0017 p:0024 s:0060 b:0060 l:000059 d:000059 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/form.rb:130
c:0016 p:0039 s:0055 b:0055 l:000054 d:000054 METHOD D:/code/h4/www/poster.rb:340
c:0015 p:0223 s:0050 b:0050 l:000049 d:000049 METHOD D:/code/h4/www/poster.rb:238
c:0014 p:0112 s:0045 b:0045 l:000044 d:000044 METHOD D:/code/h4/www/poster.rb:286
c:0013 p:0330 s:0042 b:0042 l:000041 d:000041 METHOD D:/code/h4/www/poster.rb:115
c:0012 p:0038 s:0033 b:0033 l:000016 d:000032 BLOCK  D:/code/h4/post.rb:22
c:0011 p:---- s:0030 b:0030 l:000029 d:000029 FINISH
c:0010 p:---- s:0028 b:0028 l:000027 d:000027 CFUNC  :times
c:0009 p:0050 s:0025 b:0025 l:000016 d:000024 BLOCK  D:/code/h4/post.rb:19
c:0008 p:---- s:0022 b:0022 l:000021 d:000021 FINISH
c:0007 p:---- s:0020 b:0020 l:000019 d:000019 CFUNC  :times
c:0006 p:0111 s:0017 b:0017 l:000016 d:000016 TOP    D:/code/h4/post.rb:14
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:000e84 d:00227c EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:000e84 d:000e84 TOP   
---------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:93: [BUG] object allocation during garbage collection phase
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0031 p:0167 s:0167 b:0163 l:000162 d:000162 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:93
c:0030 p:0111 s:0155 b:0155 l:000154 d:000154 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2353
c:0029 p:0024 s:0147 b:0147 l:000146 d:000146 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2328
c:0028 p:0099 s:0142 b:0142 l:000141 d:000141 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2288
c:0027 p:0050 s:0136 b:0136 l:000898 d:000898 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/response_reader.rb:15
c:0026 p:0021 s:0128 b:0128 l:000127 d:000127 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25
c:0025 p:0067 s:0124 b:0124 l:001788 d:000123 BLOCK  D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:490
c:0024 p:0017 s:0120 b:0120 l:000112 d:000119 BLOCK  D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1120
c:0023 p:0038 s:0118 b:0118 l:000117 d:000117 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2251
c:0022 p:0110 s:0113 b:0113 l:000112 d:000112 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1119
c:0021 p:0097 s:0108 b:0108 l:000107 d:000107 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103
c:0020 p:0513 s:0101 b:0101 l:001788 d:001788 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485
c:0019 p:0170 s:0075 b:0075 l:000074 d:000074 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:413
c:0018 p:0123 s:0066 b:0066 l:000065 d:000065 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:344
c:0017 p:0024 s:0060 b:0060 l:000059 d:000059 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/form.rb:130
c:0016 p:0039 s:0055 b:0055 l:000054 d:000054 METHOD D:/code/h4/www/poster.rb:340
c:0015 p:0223 s:0050 b:0050 l:000049 d:000049 METHOD D:/code/h4/www/poster.rb:238
c:0014 p:0112 s:0045 b:0045 l:000044 d:000044 METHOD D:/code/h4/www/poster.rb:286
c:0013 p:0330 s:0042 b:0042 l:000041 d:000041 METHOD D:/code/h4/www/poster.rb:115
c:0012 p:0038 s:0033 b:0033 l:000016 d:000032 BLOCK  D:/code/h4/post.rb:22
c:0011 p:---- s:0030 b:0030 l:000029 d:000029 FINISH
c:0010 p:---- s:0028 b:0028 l:000027 d:000027 CFUNC  :times
c:0009 p:0050 s:0025 b:0025 l:000016 d:000024 BLOCK  D:/code/h4/post.rb:19
c:0008 p:---- s:0022 b:0022 l:000021 d:000021 FINISH
c:0007 p:---- s:0020 b:0020 l:000019 d:000019 CFUNC  :times
c:0006 p:0111 s:0017 b:0017 l:000016 d:000016 TOP    D:/code/h4/post.rb:14
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:000e84 d:00227c EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:000e84 d:000e84 TOP   
---------------------------
-- Ruby level backtrace information-----------------------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:93:in `read'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2353:in `read_chunked'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2328:in `read_body_0'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2288:in `read_body'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/response_reader.rb:15:in `handle'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25:in `handle'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:490:in `block in fetch_page'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1120:in `block in transport_request'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2251:in `reading_body'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1119:in `transport_request'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103:in `request'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485:in `fetch_page'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:413:in `post_form'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:344:in `submit'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/form.rb:130:in `submit'
D:/code/h4/www/poster.rb:340:in `submit'
D:/code/h4/www/poster.rb:238:in `register'
D:/code/h4/www/poster.rb:286:in `login'
D:/code/h4/www/poster.rb:115:in `checkifworks'
D:/code/h4/post.rb:22:in `block (2 levels) in <top (required)>'
D:/code/h4/post.rb:19:in `times'
D:/code/h4/post.rb:19:in `block in <top (required)>'
D:/code/h4/post.rb:14:in `times'
D:/code/h4/post.rb:14:in `<top (required)>'
-e:1:in `load'
-e:1:in `<main>'

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

I'll try to use Jruby in case I get to use nokogiri with it. Here is another dump, if it may somehow be useful
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135: [BUG] Segmentation fault
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0026 p:---- s:0142 b:0142 l:000141 d:000141 CFUNC  :sysread
c:0025 p:0019 s:0138 b:0137 l:000adc d:000136 BLOCK  D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135
c:0024 p:0103 s:0135 b:0135 l:000e08 d:000e08 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:52
c:0023 p:0026 s:0123 b:0123 l:000122 d:000122 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:82
c:0022 p:0013 s:0117 b:0117 l:000adc d:000adc METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:134
c:0021 p:0025 s:0114 b:0114 l:000113 d:000113 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:116
c:0020 p:0013 s:0108 b:0108 l:000107 d:000107 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:126
c:0019 p:0012 s:0105 b:0105 l:000104 d:000104 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2135
c:0018 p:0013 s:0099 b:0099 l:000098 d:000098 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2124
c:0017 p:0069 s:0091 b:0091 l:000090 d:000090 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1117
c:0016 p:0097 s:0086 b:0086 l:000085 d:000085 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103
c:0015 p:0513 s:0079 b:0079 l:0025a0 d:0025a0 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485
c:0014 p:0346 s:0053 b:0053 l:000052 d:000052 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238
c:0013 p:0016 s:0044 b:0044 l:000043 d:000043 METHOD D:/code/h4/www/poster.rb:185
c:0012 p:0085 s:0040 b:0040 l:000039 d:000039 METHOD D:/code/h4/www/poster.rb:217
c:0011 p:0112 s:0035 b:0035 l:000034 d:000034 METHOD D:/code/h4/www/poster.rb:286
c:0010 p:0308 s:0032 b:0032 l:000031 d:000031 METHOD D:/code/h4/www/poster.rb:115
c:0009 p:0011 s:0023 b:0023 l:000015 d:000022 BLOCK  D:/code/h4/post.rb:14
c:0008 p:---- s:0021 b:0021 l:000020 d:000020 FINISH
c:0007 p:---- s:0019 b:0019 l:000018 d:000018 CFUNC  :times
c:0006 p:0107 s:0016 b:0016 l:000015 d:000015 TOP    D:/code/h4/post.rb:13
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:000604 d:001a54 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:000604 d:000604 TOP   
---------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135: [BUG] object allocation during garbage collection phase
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0026 p:---- s:0142 b:0142 l:000141 d:000141 CFUNC  :sysread
c:0025 p:0019 s:0138 b:0137 l:000adc d:000136 BLOCK  D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135
c:0024 p:0103 s:0135 b:0135 l:000e08 d:000e08 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:52
c:0023 p:0026 s:0123 b:0123 l:000122 d:000122 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:82
c:0022 p:0013 s:0117 b:0117 l:000adc d:000adc METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:134
c:0021 p:0025 s:0114 b:0114 l:000113 d:000113 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:116
c:0020 p:0013 s:0108 b:0108 l:000107 d:000107 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:126
c:0019 p:0012 s:0105 b:0105 l:000104 d:000104 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2135
c:0018 p:0013 s:0099 b:0099 l:000098 d:000098 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2124
c:0017 p:0069 s:0091 b:0091 l:000090 d:000090 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1117
c:0016 p:0097 s:0086 b:0086 l:000085 d:000085 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103
c:0015 p:0513 s:0079 b:0079 l:0025a0 d:0025a0 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485
c:0014 p:0346 s:0053 b:0053 l:000052 d:000052 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238
c:0013 p:0016 s:0044 b:0044 l:000043 d:000043 METHOD D:/code/h4/www/poster.rb:185
c:0012 p:0085 s:0040 b:0040 l:000039 d:000039 METHOD D:/code/h4/www/poster.rb:217
c:0011 p:0112 s:0035 b:0035 l:000034 d:000034 METHOD D:/code/h4/www/poster.rb:286
c:0010 p:0308 s:0032 b:0032 l:000031 d:000031 METHOD D:/code/h4/www/poster.rb:115
c:0009 p:0011 s:0023 b:0023 l:000015 d:000022 BLOCK  D:/code/h4/post.rb:14
c:0008 p:---- s:0021 b:0021 l:000020 d:000020 FINISH
c:0007 p:---- s:0019 b:0019 l:000018 d:000018 CFUNC  :times
c:0006 p:0107 s:0016 b:0016 l:000015 d:000015 TOP    D:/code/h4/post.rb:13
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:000604 d:001a54 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:000604 d:000604 TOP   
---------------------------
-- Ruby level backtrace information-----------------------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135:in `sysread'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:135:in `block in rbuf_fill'
D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:52:in `timeout'
D:/ruby-1.9.1/lib/ruby/1.9.1/timeout.rb:82:in `timeout'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:134:in `rbuf_fill'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:116:in `readuntil'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/protocol.rb:126:in `readline'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2135:in `read_status_line'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:2124:in `read_new'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1117:in `transport_request'
D:/ruby-1.9.1/lib/ruby/1.9.1/net/http.rb:1103:in `request'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:485:in `fetch_page'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238:in `get'
D:/code/h4/www/poster.rb:185:in `myget'
D:/code/h4/www/poster.rb:217:in `register'
D:/code/h4/www/poster.rb:286:in `login'
D:/code/h4/www/poster.rb:115:in `checkifworks'
D:/code/h4/post.rb:14:in `block in <top (required)>'
D:/code/h4/post.rb:13:in `times'
D:/code/h4/post.rb:13:in `<top (required)>'
-e:1:in `load'
-e:1:in `<main>'

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

And yet another. I would expect that since I'm not reading any memory directly or making some relatively low-level manipulations the worst thing I can get from Ruby Interpreter must be an Exception? Am I right?
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078: [BUG] Segmentation fault
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0024 p:---- s:0134 b:0134 l:000133 d:000133 CFUNC  :collect
c:0023 p:0017 s:0131 b:0131 l:000130 d:000130 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078
c:0022 p:0052 s:0128 b:0127 l:000126 d:000126 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1051
c:0021 p:0033 s:0123 b:0123 l:000122 d:000122 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:740
c:0020 p:0555 s:0116 b:0116 l:000115 d:000115 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/uri_resolver.rb:62
c:0019 p:0021 s:0107 b:0107 l:000106 d:000106 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25
c:0018 p:0251 s:0103 b:0103 l:000102 d:000102 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:457
c:0017 p:0346 s:0077 b:0077 l:000076 d:000076 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238
c:0016 p:0258 s:0068 b:0068 l:000a74 d:000067 BLOCK  D:/code/h4/www/poster.rb:464
c:0015 p:---- s:0052 b:0052 l:000051 d:000051 FINISH
c:0014 p:---- s:0050 b:0050 l:000049 d:000049 CFUNC  :each
c:0013 p:0243 s:0047 b:0047 l:000a74 d:000a74 METHOD D:/code/h4/www/poster.rb:446
c:0012 p:0174 s:0040 b:0040 l:000039 d:000039 METHOD D:/code/h4/www/poster.rb:232
c:0011 p:0112 s:0035 b:0035 l:000034 d:000034 METHOD D:/code/h4/www/poster.rb:286
c:0010 p:0308 s:0032 b:0032 l:000031 d:000031 METHOD D:/code/h4/www/poster.rb:115
c:0009 p:0011 s:0023 b:0023 l:000015 d:000022 BLOCK  D:/code/h4/post.rb:14
c:0008 p:---- s:0021 b:0021 l:000020 d:000020 FINISH
c:0007 p:---- s:0019 b:0019 l:000018 d:000018 CFUNC  :times
c:0006 p:0107 s:0016 b:0016 l:000015 d:000015 TOP    D:/code/h4/post.rb:13
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:0001d4 d:001624 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:0001d4 d:0001d4 TOP   
---------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078: [BUG] object allocation during garbage collection phase
ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-mswin32]

-- control frame ----------
c:0024 p:---- s:0134 b:0134 l:000133 d:000133 CFUNC  :collect
c:0023 p:0017 s:0131 b:0131 l:000130 d:000130 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078
c:0022 p:0052 s:0128 b:0127 l:000126 d:000126 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1051
c:0021 p:0033 s:0123 b:0123 l:000122 d:000122 METHOD D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:740
c:0020 p:0555 s:0116 b:0116 l:000115 d:000115 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/uri_resolver.rb:62
c:0019 p:0021 s:0107 b:0107 l:000106 d:000106 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25
c:0018 p:0251 s:0103 b:0103 l:000102 d:000102 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:457
c:0017 p:0346 s:0077 b:0077 l:000076 d:000076 METHOD D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238
c:0016 p:0258 s:0068 b:0068 l:000a74 d:000067 BLOCK  D:/code/h4/www/poster.rb:464
c:0015 p:---- s:0052 b:0052 l:000051 d:000051 FINISH
c:0014 p:---- s:0050 b:0050 l:000049 d:000049 CFUNC  :each
c:0013 p:0243 s:0047 b:0047 l:000a74 d:000a74 METHOD D:/code/h4/www/poster.rb:446
c:0012 p:0174 s:0040 b:0040 l:000039 d:000039 METHOD D:/code/h4/www/poster.rb:232
c:0011 p:0112 s:0035 b:0035 l:000034 d:000034 METHOD D:/code/h4/www/poster.rb:286
c:0010 p:0308 s:0032 b:0032 l:000031 d:000031 METHOD D:/code/h4/www/poster.rb:115
c:0009 p:0011 s:0023 b:0023 l:000015 d:000022 BLOCK  D:/code/h4/post.rb:14
c:0008 p:---- s:0021 b:0021 l:000020 d:000020 FINISH
c:0007 p:---- s:0019 b:0019 l:000018 d:000018 CFUNC  :times
c:0006 p:0107 s:0016 b:0016 l:000015 d:000015 TOP    D:/code/h4/post.rb:13
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
c:0003 p:0061 s:0006 b:0006 l:0001d4 d:001624 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:0001d4 d:0001d4 TOP   
---------------------------
-- Ruby level backtrace information-----------------------------------------
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078:in `collect'
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1078:in `component_ary'
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:1051:in `=='
D:/ruby-1.9.1/lib/ruby/1.9.1/uri/generic.rb:740:in `merge'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain/uri_resolver.rb:62:in `handle'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize/chain.rb:25:in `handle'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:457:in `fetch_page'
D:/ruby-1.9.1/lib/ruby/gems/1.9.1/gems/mechanize-0.9.3/lib/www/mechanize.rb:238:in `get'
D:/code/h4/www/poster.rb:464:in `block in fillform'
D:/code/h4/www/poster.rb:446:in `each'
D:/code/h4/www/poster.rb:446:in `fillform'
D:/code/h4/www/poster.rb:232:in `register'
D:/code/h4/www/poster.rb:286:in `login'
D:/code/h4/www/poster.rb:115:in `checkifworks'
D:/code/h4/post.rb:14:in `block in <top (required)>'
D:/code/h4/post.rb:13:in `times'
D:/code/h4/post.rb:13:in `<top (required)>'
-e:1:in `load'
-e:1:in `<main>'

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

A:

I can only think of three things, which you have probably already considered. But for the record:

Try jRuby, just to see what happens. This may pose some issues with native extensions in all those libraries.
Bring this up on a ruby forum.
Bite the bullet, compile ruby with -g, and debug the C code. If you fix it I will send you a bottle of central coast wine, if that's legal...

