Rails - Oct 2012 - unexpected return (LocalJumpError) only when executing this code within autoloaded classes?

Posted on stackoverflow but no traction yet:
http://stackoverflow.com/questions/12942505/why-does-using-set-trace-func-work-in-some-places-but-cause-unexpected-return-l

The following is a generified part of the code in a gem I''m working on:

    module SomeModule
      class << self
        attr_accessor :procedure
    
        def log_events(*args)
          args.flatten!
          if args.size == 1
            eval "set_trace_func proc {|event, file, line, id, binding, 
classname| begin; SomeModule.procedure.call(event, file, line, id, binding, 
classname) if event == #{args[0].inspect}; rescue SystemExit, Interrupt; 
raise; rescue Exception; end}"
          elsif args.size > 1
            eval "set_trace_func proc {|event, file, line, id, binding, 
classname| begin; SomeModule.procedure.call(event, file, line, id, binding, 
classname) if #{args.inspect}.include?(event); rescue SystemExit, 
Interrupt; raise; rescue Exception; end}"
          else
            # ...
          end
        end
      end
    end
    
    SomeModule.procedure = lambda {|event, file, line, id, binding, 
classname| puts "#{event} #{file}.#{line} #{binding} #{classname}
#{id}"}

When I then call:

    SomeModule.log_events ''call'', ''return''

just before the configure block in my Rails app''s 
`config/environments/development.rb`, it works fine and continues to work.

But, when I call it in `app/controllers/application_controller.rb` above or 
below the class definition, Rails dies during autoloading in 
activesupport-3.2.8/lib/active_support/dependencies.rb:469 due to an 
unexpected return (LocalJumpError).

Here is the log:

    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb.30
#<Binding:0x007ff7b1403d40> Rails::Initializable::Initializer run
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb.54
#<Binding:0x007ff7b14039a8> Rails::Initializable run_initializers
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application.rb.136
#<Binding:0x007ff7b1403728> Rails::Application initialize!
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/railtie/configurable.rb.30
#<Binding:0x007ff7b1403480> Rails::Railtie::Configurable::ClassMethods 
method_missing
    call 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.275
#<Binding:0x007ff7b1402aa8> ActiveSupport::Dependencies::Blamable 
blame_file!
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.277
#<Binding:0x007ff7b1402440> ActiveSupport::Dependencies::Blamable 
blame_file!
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.233
#<Binding:0x007ff7b1401a40> ActiveSupport::Dependencies::Loadable 
load_dependency
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.251
#<Binding:0x007ff7b1409790> ActiveSupport::Dependencies::Loadable require
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb.51
#<Binding:0x007ff7b14093f8> Rack::Builder initialize
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb.40
#<Binding:0x007ff7b1408ac0> Rack::Builder parse_file
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb.200
#<Binding:0x007ff7b1408840> Rack::Server app
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb.46
#<Binding:0x007ff7b1408598> Rails::Server app
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb.301
#<Binding:0x007ff7b14082f0> Rack::Server wrapped_app
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb.252
#<Binding:0x007ff7b1408048> Rack::Server start
    call 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb.179
#<Binding:0x007ff7b1407c88> Rack::Server options
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb.181
#<Binding:0x007ff7b14078f0> Rack::Server options
    Exiting
    return 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb.74
#<Binding:0x007ff7b1406ec8> Rails::Server start
    
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in
`load'': unexpected return (LocalJumpError)
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in
`block in load_file''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:639:in
`new_constants_in''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:468:in
`load_file''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:353:in
`require_or_load''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:502:in
`load_missing_constant''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:192:in
`block in const_missing''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in
`each''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in
`const_missing''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller/menu.rb:2:in
`<module:ActiveAdmin>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller/menu.rb:1:in
`<top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`block in require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in
`load_dependency''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller.rb:2:in
`<top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller/actions.rb:2:in
`<module:ActiveAdmin>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller/actions.rb:1:in
`<top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`block in require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in
`load_dependency''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller.rb:2:in
`<top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/batch_actions.rb:7:in
`block in <top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:25:in
`call''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:25:in
`block in dispatch''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:24:in
`each''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:24:in
`dispatch''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/application.rb:179:in
`load!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/application.rb:205:in
`routes''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin.rb:79:in
`routes''
      from /path/to/git/some_app_gemset/config/routes.rb:2:in `block in 
<top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:282:in
`instance_exec''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:282:in
`eval_block''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:260:in
`draw''
      from /path/to/git/some_app_gemset/config/routes.rb:1:in `<top 
(required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in
`load''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in
`block in load''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in
`load_dependency''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in
`load''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in
`block in load_paths''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in
`each''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in
`load_paths''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:16:in
`reload!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application.rb:108:in
`reload_routes!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/reloader.rb:34:in
`reload!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin/reloader.rb:61:in
`block in attach!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:429:in
`_run__1105766863370890952__prepare__156232144867029268__callbacks''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in
`__run_callback''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in
`_run_prepare_callbacks''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in
`run_callbacks''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/middleware/reloader.rb:74:in
`prepare!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/middleware/reloader.rb:48:in
`prepare!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/finisher.rb:47:in
`block in <module:Finisher>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:30:in
`instance_exec''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:30:in
`run''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:55:in
`block in run_initializers''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:54:in
`each''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:54:in
`run_initializers''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application.rb:136:in
`initialize!''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in
`method_missing''
      from /path/to/git/some_app_gemset/config/environment.rb:5:in `<top 
(required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`block in require''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in
`load_dependency''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
`require''
      from /path/to/git/some_app_gemset/config.ru:4:in `block in
<main>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:51:in
`instance_eval''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:51:in
`initialize''
      from /path/to/git/some_app_gemset/config.ru:1:in `new''
      from /path/to/git/some_app_gemset/config.ru:1:in `<main>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:40:in
`eval''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:40:in
`parse_file''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb:200:in
`app''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb:46:in
`app''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb:301:in
`wrapped_app''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb:252:in
`start''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb:70:in
`start''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:55:in
`block in <top (required)>''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:50:in
`tap''
      from 
/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:50:in
`<top (required)>''
      from script/rails:6:in `require''
      from script/rails:6:in `<main>''

Any idea what I''m doing wrong, or how to determine when and where this
type
of usage of set_trace_func should work?

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