lo_unlink failed

[yevhene]

After I delete model from DB, carrierwave-postgresql tries to call lo_unlink but there is no object with this oid in db already.

I am usin ActiveAdmin. It can be related.

PG::Error - lo_unlink failed:
  carrierwave-postgresql (0.1.5) lib/carrierwave/storage/postgresql_lo.rb:34:in `delete'
  carrierwave (0.10.0) lib/carrierwave/uploader/remove.rb:15:in `block in remove!'
  carrierwave (0.10.0) lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks'
  carrierwave (0.10.0) lib/carrierwave/uploader/remove.rb:14:in `remove!'
  carrierwave (0.10.0) lib/carrierwave/uploader/versions.rb:289:in `block in remove_versions!'
  carrierwave (0.10.0) lib/carrierwave/uploader/versions.rb:289:in `remove_versions!'
  carrierwave (0.10.0) lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
  carrierwave (0.10.0) lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
  carrierwave (0.10.0) lib/carrierwave/uploader/remove.rb:14:in `remove!'
  carrierwave (0.10.0) lib/carrierwave/mount.rb:392:in `remove!'
  carrierwave (0.10.0) lib/carrierwave/mount.rb:195:in `remove_image!'
  carrierwave (0.10.0) lib/carrierwave/orm/activerecord.rb:49:in `remove_image!'
  activesupport (4.2.4) lib/active_support/callbacks.rb:432:in `block in make_lambda'
  activesupport (4.2.4) lib/active_support/callbacks.rb:253:in `block in conditional'
  activesupport (4.2.4) lib/active_support/callbacks.rb:506:in `block in call'
  activesupport (4.2.4) lib/active_support/callbacks.rb:506:in `call'
  activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
  activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_commit_callbacks'
  activerecord (4.2.4) lib/active_record/transactions.rb:314:in `committed!'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/transaction.rb:89:in `commit_records'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/transaction.rb:153:in `commit'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/transaction.rb:175:in `commit_transaction'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/transaction.rb:194:in `within_new_transaction'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
  activerecord (4.2.4) lib/active_record/transactions.rb:220:in `transaction'
  activerecord (4.2.4) lib/active_record/transactions.rb:348:in `with_transaction_returning_status'
  activerecord (4.2.4) lib/active_record/transactions.rb:281:in `destroy'
   () home/yevhene/.rvm/gems/ruby-2.2.3@footstock/bundler/gems/activeadmin-06bf79c58216/lib/active_admin/resource_controller/data_access.rb:190:in `block in destroy_resource'
  activesupport (4.2.4) lib/active_support/core_ext/object/try.rb:77:in `try!'
  activesupport (4.2.4) lib/active_support/core_ext/object/try.rb:63:in `try'
   () home/yevhene/.rvm/gems/ruby-2.2.3@footstock/bundler/gems/activeadmin-06bf79c58216/lib/active_admin/callbacks.rb:79:in `block (2 levels) in define_active_admin_callbacks'
   () home/yevhene/.rvm/gems/ruby-2.2.3@footstock/bundler/gems/activeadmin-06bf79c58216/lib/active_admin/resource_controller/data_access.rb:189:in `destroy_resource'
  inherited_resources (1.6.0) lib/inherited_resources/actions.rb:58:in `destroy'
  actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (4.2.4) lib/abstract_controller/base.rb:198:in `process_action'
  actionpack (4.2.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.2.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
  activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
  activesupport (4.2.4) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
  activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
  activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
  activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
  activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
  activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
  activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
  actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.2.4) lib/abstract_controller/base.rb:137:in `process'
  actionview (4.2.4) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.2.4) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.2.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.2.4) lib/action_controller/metal.rb:237:in `block in action'
  actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in `dispatch'
  actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:45:in `serve'
  actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in `block in serve'
  actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `serve'
  actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in `call'
  bullet (4.14.7) lib/bullet/rack.rb:10:in `call'
  warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.3) lib/warden/manager.rb:34:in `call'
  rack (1.6.4) lib/rack/etag.rb:24:in `call'
  rack (1.6.4) lib/rack/conditionalget.rb:38:in `call'
  rack (1.6.4) lib/rack/head.rb:13:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:in `call'
  rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.2.4) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.2.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
  activerecord (4.2.4) lib/active_record/migration.rb:377:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.2.4) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
  activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
  activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
  better_errors (2.1.1) lib/better_errors/middleware.rb:57:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.4) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.4) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.4) lib/rails/rack/logger.rb:20:in `call'
  quiet_assets (1.1.0) lib/quiet_assets.rb:27:in `call_with_quiet_assets'
  actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.4) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
  rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.4) lib/rails/engine.rb:518:in `call'
  railties (4.2.4) lib/rails/application.rb:165:in `call'
  rack (1.6.4) lib/rack/content_length.rb:15:in `call'
  thin (1.6.4) lib/thin/connection.rb:86:in `block in pre_process'
  thin (1.6.4) lib/thin/connection.rb:84:in `pre_process'
  thin (1.6.4) lib/thin/connection.rb:53:in `process'
  thin (1.6.4) lib/thin/connection.rb:39:in `receive_data'
  eventmachine (1.0.8) lib/eventmachine.rb:193:in `run'
  thin (1.6.4) lib/thin/backends/base.rb:73:in `start'
  thin (1.6.4) lib/thin/server.rb:162:in `start'
  rack (1.6.4) lib/rack/handler/thin.rb:19:in `run'
  rack (1.6.4) lib/rack/server.rb:286:in `start'
  railties (4.2.4) lib/rails/commands/server.rb:80:in `start'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:80:in `block in server'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:75:in `server'
  railties (4.2.4) lib/rails/commands/commands_tasks.rb:39:in `run_command!'
  railties (4.2.4) lib/rails/commands.rb:17:in `<top (required)>'
  bin/rails:8:in `<top (required)>'
  spring (1.4.0) lib/spring/client/rails.rb:28:in `call'
  spring (1.4.0) lib/spring/client/command.rb:7:in `call'
  spring (1.4.0) lib/spring/client.rb:28:in `run'
  spring (1.4.0) bin/spring:49:in `<top (required)>'
  spring (1.4.0) lib/spring/binstub.rb:11:in `<top (required)>'
  /home/yevhene/.rvm/rubies/ruby-2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
  bin/spring:13:in `<top (required)>'
  bin/rails:3:in `<main>'

$ tail -f /var/log/postgresql/postgresql-9.4-main.log
2015-10-10 14:39:59 EEST [16842-9] postgres@footstock_develop ERROR:  large object 1179618 does not exist

[diogob]

Did you expect the error to be treated in a different way? Or the problem is that this is happening all deletes? If is the later, are you sure the large objects are there before the dele command?

[yevhene]

This is happening all deletes. LO is accessible before destroy.

[diogob]

I'll look into it. If you could send some code for a failing spec that would be very helpful :D

[piotrpawlik]

Is there any update in this matter? I am facing the same problem.

[yevhene]

@ppfp no, sorry. I am moved to simple file storage. (S3 - is alternative).

[diogob]

@ppfp I'm not currently using this code, but if someone provides a failing spec I'd be glad to fix it.

[sohrabtowfighi]

I bypassed the issue by first assigning model instance oid to nil, then saving, then running vacuum_lo then destroying. I do not know how expensive the vacuum_lo operation is, but I think it is fine for my use-case.

[shtirlic]

Also had this issue, I found that lo_unlink triggered two times, at first in after_save callback, and second inafter_commit callback => so oid is not present at the last call and it fails to delete object.

[RailsCod3rFuture]

Has this issue been fixed? When I try to use model.destroy_all, I receive PG::Error: lo_unlink failed. How can I avoid this error in both cases of removing one object and destroying all objects that relate to a particular model instance?