dyld: lazy symbol binding failed: Symbol not found: _system_free

error.txt

metric ShareFactor 
dyld: lazy symbol binding failed: Symbol not found: _system_free
  Referenced from: /Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/bson_ext-1.3.0/ext/bson_ext/cbson.bundle
  Expected in: flat namespace

dyld: Symbol not found: _system_free
  Referenced from: /Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/bson_ext-1.3.0/ext/bson_ext/cbson.bundle
  Expected in: flat namespace

rake aborted!
Command /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -I"lib"  "/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rspec-1.3.0/bin/spec" "spec/controllers/account_settings_controller_spec.rb" "spec/controllers/actions_controller_spec.rb" "spec/controllers/admin/actions_controller_spec.rb" "spec/controllers/admin/admin_requests_controller_spec.rb" "spec/controllers/admin/basic_tools_controller_spec.rb" "spec/controllers/admin/blog_controller_spec.rb" "spec/controllers/admin/bulk_email_controller_spec.rb" "spec/controllers/application_controller_spec.rb" "spec/controllers/changes_controller_spec.rb" "spec/controllers/contacts_controller_spec.rb" "spec/controllers/members_controller_spec.rb" "spec/controllers/my_change_controller_spec.rb" "spec/controllers/opinions_controller_spec.rb" "spec/controllers/petition_updates_controller_spec.rb" "spec/controllers/petitions_controller_spec.rb" "spec/controllers/stories_controller_spec.rb" "spec/controllers/widgets/content_controller_spec.rb" "spec/helpers/application_helper_spec.rb" "spec/helpers/widgets_helper_spec.rb" "spec/integration/redirects_spec.rb" "spec/lib/metric/combination_spec.rb" "spec/lib/metric/count_spec.rb" "spec/lib/metric/rate_spec.rb" "spec/lib/permutation_table/permutation_spec.rb" "spec/lib/permutation_table_spec.rb" "spec/lib/resque_workers/backfill_tracked_events_spec.rb" "spec/lib/resque_workers/disable_upsell_losers_spec.rb" "spec/lib/resque_workers/expire_petitions_spec.rb" "spec/lib/resque_workers/import_embeds_proxy_request_logs_spec.rb" "spec/lib/resque_workers/load_organization_suppression_spec.rb" "spec/lib/resque_workers/resize_photo_spec.rb" "spec/lib/resque_workers/scrub_subscription_spec.rb" "spec/lib/resque_workers/send_new_petition_flow_email_spec.rb" "spec/lib/resque_workers/send_petition_expiration_warnings_spec.rb" "spec/lib/resque_workers/send_petition_signature_lull_email_spec.rb" "spec/lib/resque_workers/send_petition_signature_notification_spec.rb" "spec/lib/resque_workers/send_weekly_petition_summary_emails_spec.rb" "spec/lib/resque_workers/submit_subscriptions_to_convio_spec.rb" "spec/lib/resque_workers/update_petition_leaderboards_spec.rb" "spec/lib/resque_workers/upload_photo_spec.rb" "spec/metrics/ad_petition_creation_rate_spec.rb" "spec/metrics/invitation_clickers_count_spec.rb" "spec/metrics/invitation_clickthrough_rate_spec.rb" "spec/metrics/invitation_page_visitors_count_spec.rb" "spec/metrics/invitation_recipients_count_spec.rb" "spec/metrics/invitation_signup_rate_spec.rb" "spec/metrics/invited_petition_show_page_visitors_count_spec.rb" "spec/metrics/invited_signups_count_spec.rb" "spec/metrics/inviter_rate_spec.rb" "spec/metrics/inviters_count_spec.rb" "spec/metrics/sent_invitation_recipients_count_spec.rb" "spec/metrics/share_factor_spec.rb" "spec/metrics/started_petition_count_spec.rb" "spec/metrics/starting_petition_from_ad_count_spec.rb" "spec/models/action_alert_content_spec.rb" "spec/models/bulk_supporter_message_spec.rb" "spec/models/change_blog_entry_spec.rb" "spec/models/cobranded_petition_partner_spec.rb" "spec/models/dia_custom_target_spec.rb" "spec/models/email_campaign_delivery_service_spec.rb" "spec/models/event_participant_spec.rb" "spec/models/event_spec.rb" "spec/models/external_share_spec.rb" "spec/models/logical_user_selector_spec.rb" "spec/models/metrics_report_spec.rb" "spec/models/multivariate_test_permutation_spec.rb" "spec/models/multivariate_test_spec.rb" "spec/models/multivariate_test_variable_spec.rb" "spec/models/opinion_spec.rb" "spec/models/organization_email_subscription_spec.rb" "spec/models/partner_subscription_list_request_spec.rb" "spec/models/petition_email_service_spec.rb" "spec/models/petition_upsell_list_spec.rb" "spec/models/photo_spec.rb" "spec/models/prompted_petition_record_spec.rb" "spec/models/scheduled_action_alert_spec.rb" "spec/models/split_test_history_spec.rb" "spec/models/split_test_variation_cache_spec.rb" "spec/models/split_test_variation_spec.rb" "spec/models/sponsor_tracking_record_spec.rb" "spec/models/tracked_event_spec.rb" "spec/models/user_filter_spec.rb" "spec/models/user_spec.rb" "spec/models/weekly_update_cause_summary_order_spec.rb" "spec/models/weekly_update_content_spec.rb" "spec/models/widget_load_count_spec.rb" "spec/presenters/discussion_spec.rb" "spec/presenters/email_invitation_results_spec.rb" "spec/presenters/petition_list_spec.rb" "spec/presenters/petition_presenter_spec.rb" "spec/presenters/petition_updates_presenter_spec.rb" "spec/presenters/story_list_spec.rb" "spec/views/admin/actions/set_sponsored_actions.html_spec.rb" --options "/Users/change/Work/change/spec/spec.opts" failed
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rspec-1.3.0/lib/spec/rake/spectask.rb:177:in `define'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:1112:in `verbose'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rspec-1.3.0/lib/spec/rake/spectask.rb:153:in `define'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:604:in `each'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Users/change/.rvm/gems/ree-1.8.7-2011.03/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19

I've hit the same bug... and I think it's in kiji:

kiji-head :001 > require 'rexml/rexml'
dyld: lazy symbol binding failed: Symbol not found: _system_free
  Referenced from: /Users/goncalossilva/.rvm/rubies/kiji-head/lib/ruby/1.8/i686-darwin10.8.0/readline.bundle
  Expected in: flat namespace

dyld: Symbol not found: _system_free
  Referenced from: /Users/goncalossilva/.rvm/rubies/kiji-head/lib/ruby/1.8/i686-darwin10.8.0/readline.bundle
  Expected in: flat namespace

Trace/BPT trap

@evan, could you take a look at this?

It might also be because of OS X's readline lib.