INTERNAL ERROR!!! invalid byte sequence in UTF-8

[pan]

Steps to reproduce the error:
rails g scaffold posts
then run the test as bellow,

$ byebug ruby -Itest test/controllers/posts_controller_test.rb -n test_should_get_index

/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:220: warning: already initialized constant Byebug::PROG_SCRIPT
/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug.rb:21: warning: previous definition of PROG_SCRIPT was here

[1, 10] in /home/pan/.rbenv/versions/2.1.1/bin/ruby
**INTERNAL ERROR!!! invalid byte sequence in UTF-8**
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/interface.rb:27:in `gsub'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/interface.rb:27:in `escape'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/interfaces/local_interface.rb:21:in `print'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/commands/list.rb:100:in `block in display_list'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/commands/list.rb:97:in `upto'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/commands/list.rb:97:in `display_list'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/commands/list.rb:21:in `execute'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:126:in `block in always_run'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:126:in `each'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:126:in `always_run'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:155:in `process_commands'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:89:in `at_line'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:49:in `block in at_line'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:47:in `synchronize'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/processors/command_processor.rb:47:in `at_line'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/lib/byebug/context.rb:78:in `at_line'
        /home/pan/.rbenv/versions/2.1.1/bin/ruby:1:in `<top (required)>'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:70:in `debug_load'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:70:in `debug_program'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:246:in `block in <top (required)>'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:245:in `loop'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:245:in `<top (required)>'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/bin/byebug:23:in `load'
        /home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/bin/byebug:23:in `<main>'#<NameError: uninitialized constant ELF>
["/home/pan/.rbenv/versions/2.1.1/bin/ruby:1:in `<top (required)>'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:70:in `debug_load'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:70:in `debug_program'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:246:in `block in <top (required)>'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:245:in `loop'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/gems/byebug-3.1.2/bin/byebug:245:in `<top (required)>'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/bin/byebug:23:in `load'", "/home/pan/.rbenv/versions/2.1.1/gemsets/rails4_1/bin/byebug:23:in `<main>'"]

[deivid-rodriguez]

Thanks for the report @pan and excuse the delay, I'll fix this as soon as I get the chance.

[deivid-rodriguez]

Hi @pan, I'm working on this right now. It should be ready soon.

EDIT: maybe not so soon... turned out to be harder than I thought.