Ecto: Application fails to compile due to deadlock with associations

[supernintendo]

Description

When updating my Ecto version from 2.1.2 to 2.2.10 my application fails to compile due to a deadlock between modules. All of the modules that are responsible for the failure appear to be compiling before the modules they depend on (i.e. associations) have finished compiling.

Environment

• Elixir 1.4.4
• PostgreSQL 9.5
• Ecto 2.2.10
• phoenix_ecto 3.2.1
• Hex 0.17.6
• Debian GNU/Linux 8 (jessie)

Current behavior

My application fails to compile with the following output:

== Compilation error on file web/models/major_appliances_form.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_assessment_sponsor.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/property_address.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/photo.ex ==
** (CompileError)  deadlocked waiting on module Haas.MasterBedroom
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/utm.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/document.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/master_bedroom.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/sponsor.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessmentSponsor
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:432: Ecto.Association.Has.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/simple_color.ex ==
** (CompileError)  deadlocked waiting on module Haas.Appliance
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/living_room.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/appliance_photo.ex ==
** (CompileError)  deadlocked waiting on module Haas.Appliance
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/scheduling_contact.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/dining_room.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/fixture.ex ==
** (CompileError)  deadlocked waiting on module Haas.Photo
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:432: Ecto.Association.Has.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/vendor_signup.ex ==
** (CompileError)  deadlocked waiting on module Haas.Photo
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:432: Ecto.Association.Has.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/water_heater.ex ==
** (CompileError)  deadlocked waiting on module Haas.Hvac
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/space.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/master_bathroom.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/services/home_assessments/clone.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    web/services/home_assessments/clone.ex:6: (module)
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6


== Compilation error on file web/models/user_event.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/sponsor_image.ex ==
** (CompileError)  deadlocked waiting on module Haas.Sponsor
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/order_number.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/room_paint.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomePaint
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_assessment_primary_user.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/kitchen.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/basement.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_checklist.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_services_payment.ex ==
** (CompileError)  deadlocked waiting on module Haas.JobRequest
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_paint.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/length.ex ==
** (CompileError)  deadlocked waiting on module Haas.Appliance
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/roof_chimney_attic.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/intro_survey.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/trax_item.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/hvac.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/residence_exterior.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/job_request.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/fixture_element.ex ==
** (CompileError)  deadlocked waiting on module Haas.Fixture
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/garage.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/services/home_assessments/export.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessmentSponsor
    web/services/home_assessments/export.ex:95: (module)
    web/services/home_assessments/export.ex:92: (module)


== Compilation error on file web/models/electrical_panel.ex ==
** (CompileError)  deadlocked waiting on module Haas.Hvac
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_assessment.ex ==
** (CompileError)  deadlocked waiting on module Haas.Photo
    web/models/home_assessment.ex:238: (module)
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6


== Compilation error on file web/models/appliance.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/home_assessment_user.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:719: Ecto.Association.BelongsTo.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


== Compilation error on file web/models/presenter.ex ==
** (CompileError)  deadlocked waiting on module Haas.HomeAssessment
    (elixir) lib/code.ex:568: Code.ensure_compiled/1
    (elixir) lib/code.ex:586: Code.ensure_compiled?/1
    lib/ecto/association.ex:432: Ecto.Association.Has.after_compile_validation/2
    lib/ecto/schema.ex:1656: anonymous fn/4 in Ecto.Schema.__after_compile__/2
    (elixir) lib/enum.ex:1755: Enum."-reduce/3-lists^foldl/2-0-"/3
    lib/ecto/schema.ex:1654: Ecto.Schema.__after_compile__/2


Compilation failed because of a deadlock between files.
The following files depended on the following modules:

         web/models/major_appliances_form.ex => Haas.HomeAssessment
       web/models/home_assessment_sponsor.ex => Haas.HomeAssessment
              web/models/property_address.ex => Haas.HomeAssessment
                         web/models/photo.ex => Haas.MasterBedroom
                           web/models/utm.ex => Haas.HomeAssessment
                      web/models/document.ex => Haas.HomeAssessment
                web/models/master_bedroom.ex => Haas.HomeAssessment
                       web/models/sponsor.ex => Haas.HomeAssessmentSponsor
                  web/models/simple_color.ex => Haas.Appliance
                   web/models/living_room.ex => Haas.HomeAssessment
               web/models/appliance_photo.ex => Haas.Appliance
            web/models/scheduling_contact.ex => Haas.HomeAssessment
                   web/models/dining_room.ex => Haas.HomeAssessment
                       web/models/fixture.ex => Haas.Photo
                 web/models/vendor_signup.ex => Haas.Photo
                  web/models/water_heater.ex => Haas.Hvac
                         web/models/space.ex => Haas.HomeAssessment
               web/models/master_bathroom.ex => Haas.HomeAssessment
      web/services/home_assessments/clone.ex => Haas.HomeAssessment
                    web/models/user_event.ex => Haas.HomeAssessment
                 web/models/sponsor_image.ex => Haas.Sponsor
                  web/models/order_number.ex => Haas.HomeAssessment
                    web/models/room_paint.ex => Haas.HomePaint
  web/models/home_assessment_primary_user.ex => Haas.HomeAssessment
                       web/models/kitchen.ex => Haas.HomeAssessment
                      web/models/basement.ex => Haas.HomeAssessment
                web/models/home_checklist.ex => Haas.HomeAssessment
         web/models/home_services_payment.ex => Haas.JobRequest
                    web/models/home_paint.ex => Haas.HomeAssessment
                        web/models/length.ex => Haas.Appliance
            web/models/roof_chimney_attic.ex => Haas.HomeAssessment
                  web/models/intro_survey.ex => Haas.HomeAssessment
                     web/models/trax_item.ex => Haas.HomeAssessment
                          web/models/hvac.ex => Haas.HomeAssessment
            web/models/residence_exterior.ex => Haas.HomeAssessment
                   web/models/job_request.ex => Haas.HomeAssessment
               web/models/fixture_element.ex => Haas.Fixture
                        web/models/garage.ex => Haas.HomeAssessment
     web/services/home_assessments/export.ex => Haas.HomeAssessmentSponsor
              web/models/electrical_panel.ex => Haas.Hvac
               web/models/home_assessment.ex => Haas.Photo
                     web/models/appliance.ex => Haas.HomeAssessment
          web/models/home_assessment_user.ex => Haas.HomeAssessment
                     web/models/presenter.ex => Haas.HomeAssessment

Expected behavior

The modules that depend on Haas.HomeAssessment wait for it to compile before compilation, allowing the application to compile successfully.

I couldn't find any reports of this issue but I might have missed it so sorry if it has already been reported. Let me know if you need any other information from my end.

Thanks!

[josevalim]

@supernintendo can you please provide an application that reproduces the error? Cyclic associations are actually fine (and I have them working in a app) so there is something else happening here causing the issue.

[supernintendo]

@josevalim Sure. The project where I'm running into this is closed source, but I'll dig a bit deeper and see if I can provide some source code that reproduces this.

[zoldar]

We have stumbled into the same problem when trying to bump ecto from 2.1.6 to 2.2.x in our project. We managed to nail it down to after_compile_validation calls for associations, like this one https://github.com/elixir-ecto/ecto/blob/master/lib/ecto/association.ex#L458. When we commented out condition clauses for Code.ensure_compiled?(queryable) check for either Has or BelongsTo association type, the deadlock didn't occur. We haven't managed to create a minimal example reproducing this issue though.

[jkslyby]

@supernintendo - I just encountered the exact same issue.

Would you happen to have module attributes that reference one of your other modules on lines 92 or 95 of web/services/home_assessments/export.ex (or anywhere else for that matter)?

If you remove/relocate those references, it should work™.

[josevalim]

If you have a way to reproduce the issue I would love to take a look at it and see if we can improve the error message or similar.

[jkslyby]

@josevalim - I will try to recreate it on a new project sometime soon. For now, here's the gist of what's happening:

defmodule MyApp.ModelA do
  schema "model_a" do
    has_many :model_bs, MyApp.ModelB
  end
  @default_preloads = [model_bs: from(b in MyApp.ModelB, order_by: [asc: b.id])]
end

defmodule MyApp.ModelB do
  schema "model_b" do
    belongs_to :model_a, MyApp.ModelA
  end
end

If I reference MyApp.ModelB inside of MyApp.ModelA in a module attribute, this causes the deadlock situation. That being said, it's probably not good to do that anyway.

[supernintendo]

@jkslyby That seems to be what is causing the problem in my case. It appears that an Ecto query set to a module attribute cannot contain a reference to another module it also depends on. Refactoring those queries allowed my application to compile. Thanks!

[supernintendo]

@josevalim Here is an application that reproduces the issue https://github.com/supernintendo/ecto_deadlock_example

[josevalim]

@supernintendo thank you! It makes sense indeed. Queries are not guaranteed to be compile-time safe and it is actually important that we recompile modules when their query sources chance. Moving it to a function is the way to go.