[ruby-core:35017] [Ruby 1.9-Bug#4350][Open] Segmentation fault and Bus Error

Bug #4350: Segmentation fault and Bus Error
http://redmine.ruby-lang.org/issues/show/4350

Author: Leon Li
Status: Open, Priority: Normal
Target version: 1.9.2
ruby -v: ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-linux]

My server crashes 0-4 times a day with segmentation faults.
The fault seems related to activerecord transaction, but it is not always a same spot, so the attached are just examples of some occurrence.

The application is a tcp server base on eventmachine.
Ruby compiled from rvm, ruby-1.9.2-p0 and ruby-1.9.2-p136
System info: Linux foo 2.6.31-gentoo-r6 #1 SMP Wed Dec 23 08:10:43 CST 2009 x86_64 Intel(R) Xeon(R) CPU E5520 @ 2.27GHz GenuineIntel GNU/Linux

Brief of logs

segfault1.ruby-1.9.2-p0.log
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/mysql2-0.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:314: [BUG] Segmentation fault

segfault2.ruby-1.9.2-p0.log 
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/activemodel-3.0.3/lib/active_model/attribute_methods.rb:327: [BUG] Segmentation fault

segfault3.ruby-1.9.2-p0.log
/usr/local/rvm/gems/ruby-1.9.2-p0/gems/mysql2-0.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:314: [BUG] Bus Error

segfault1.ruby-1.9.2-p136.log
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:310: [BUG] Segmentation fault

segfault2.ruby-1.9.2-p136.log
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:242: [BUG] Segmentation fault

segfault3.ruby-1.9.2-p136.log
/path_to_server/2011-01-30_231948/config/initializers/encoding.rb:12: [BUG] Segmentation fault

content of /path_to_server/2011-01-30_231948/config/initializers/encoding.rb

  1 #workaround for "incompatible character encodings: UTF-8 and ASCII-8BIT"
  2 #due to "测试" + [23423424234].pack("G")
  3   
  4 unless SERVER_TYPE == 'proxy'
  5   Encoding.default_external = Encoding::UTF_8 if RUBY_VERSION > "1.9"
  6   if RUBY_VERSION > '1.9'
  7     String.class_eval do
  8       alias_method :quick_append, :<< unless method_defined? :quick_append
  9       alias_method :quick_add, :+ unless method_defined? :quick_add
 10       def <<(str)
 11         str.force_encoding("UTF-8") unless str.frozen?
 12         self.quick_append str
 13       end
 14       def +(str)
 15         str.force_encoding("UTF-8") unless str.frozen?
 16         self.quick_add str
 17       end
 18     end
 19     StringIO.class_eval do
 20       alias_method :quick_write, :write unless method_defined? :quick_write
 21       def write(str)
 22         str.force_encoding("UTF-8") unless (!str.is_a? String) || str.frozen?
 23         self.quick_write str
 24       end
 25     end
 26 
 27   else
 28     String.class_eval do
 29       def force_encoding(encode)
 30         self
 31       end
 32     end
 33   end
 34   Fixnum.class_eval do
 35     alias_method :quick_to_s, :to_s unless method_defined? :quick_to_s
 36     def force_encoding(encode)
 37       self
 38     end
 39     def to_s(base=10)
 40       quick_to_s(base).force_encoding("UTF-8")
 41     end
 42   end
 43   Array.class_eval do
 44     alias_method :quick_pack, :pack unless method_defined? :quick_pack
 45     def pack(*args)
 46       quick_pack(*args).force_encoding("UTF-8")
 47     end
 48   end
 49 end


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