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SystemStackError, stack level too deep #349

sonereker opened this Issue Feb 4, 2012 · 18 comments


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With latest RVM, Ruby 1.9.2, delayed_job_active_record (0.3.2), Rails 3.2.0, pow (or webrick/thin);

I get "stack level too deep" error with notifier.

Notifier.delay(queue: "invitation").invitation(email, name)

Any suggestions?

pascalj commented Feb 14, 2012

I had the same error (also with ActionMailer, other jobs seemed to work). I experimented a bit and, although I don't know exactly why, it had to do with a require 'yaml' that was leftover in my config/boot.rb. Removing the line fixed the problem for me.


a config/initializer setup with content below breaks some (all?) .delay. method calls.

require 'yaml'
YAML::ENGINE.yamler = 'psych'

Error received is this (no further stack trace, that's it)

  SystemStackError (stack level too deep):
    actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:70

Rails 3.2.1, Delayed Job 2.1.4 (last working one for me with Rails 3.2.1 at this time).

I had SystemStackError on mailers with rails 3.2.1, ruby 1.9.2p290 and delayed_job+delayed_job_mongoid. Upgrading to ruby 1.9.3p150 solved problem for me.

I'm getting the same error, but it doesn't seem to fail if I trie the identical steps in a rails console (on the same server). And I canot reproduce the error at all on a development OXS server with action mailer deliveries set to the same as the ubuntu staging server.

My configuration is RVM + Rails 3.2.0 + Passenger + Apache

The failing code looks like

@user = User.new()
# set various properties of the user

if try_save(@user)

The error is

SystemStackError (stack level too deep):
  activesupport (3.2.0) lib/active_support/callbacks.rb:409

Here's my RVM configuration


    uname:       "Linux ve.77n7w8rt.vesrv.com 2.6.18-028stab099.3 #1 SMP Wed Mar 7 15:20:22 MSK 2012 x86_64 GNU/Linux"
    bash:        "/bin/bash => GNU bash, version 4.1.5(1)-release (x86_64-pc-linux-gnu)"
    zsh:         " => not installed"

    version:      "rvm 1.10.2 by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.beginrescueend.com/]"
    updated:      "2 months 7 days 19 hours 35 minutes 29 seconds ago"

    interpreter:  "ruby"
    version:      "1.9.2p290"
    date:         "2011-07-09"
    platform:     "x86_64-linux"
    patchlevel:   "2011-07-09 revision 32553"
    full_version: "ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]"

and relevant gem versions

  * rails (3.2.0)
  * delayed_job (3.0.1)
  * delayed_job_active_record (0.3.2)

After some digging around I noticed that the error is raised from


and the callstack shows ..

/shared/bundle/ruby/1.9.1/gems/delayed_job-3.0.1/lib/delayed/message_sending.rb:13:in `method_missing'
... # application code that invokes SomeMailer.delay.mail_method(with_params)

psych is indeed what is causing this. I'm still unclear on why this is happening only in one of my staging environments.

@mendable how did you resolve your issue? Did you actually find and remove a call to require 'yaml' as @pascalj suggested (above) or did you upgrade ruby to 1.9.3? Something else? Thanks in advance.


After upgrading to 1.9.3-p125 and rails 3.2.3, the problem no longer reproduces for me.

I am getting this error.

Upgraded to 1.9.3-p125 and rails 3.2.3 and I still have this error.

pftg commented Apr 27, 2012

Quick fix: just add encode_with with empty method body for Mailer, that psych will know how to serialize Mailer class.

class Mailer
  def encode_with coder

Problem lines which hide this bug by 'stack too deep' in https://github.com/collectiveidea/delayed_job/blob/master/lib/delayed/yaml_ext.rb#L5
so line with:

require File.expand_path('../psych_ext', __FILE__)

is never calls
but it's needed when to_yaml use psych engine as default.

UPD.: In my dependency was systemu, which reverting YAML engine to psych after DelayedJobs required with 'syck' engine, so yaml_ext works correctly, just my bad with my dependencies:

carrierwave_direct => uuid => macaddr => systemu.

kaeus commented May 10, 2012

I've been getting something similar, however its just with DelayedJob running without any jobs being started. I used DJ for custom jobs, but that is it. I did add a mailer around when this started, but I tried to remove the related files. I'm not sure if that was exactly what caused this to start or not for me. I had Daemon Spawn working nicely, then for some reason this started to happen. I'm trying to recall what gems I updated.

Using the following versions:
Ruby (1.9.3-p125)
Rails (3.2.3)
delayed_job (3.0.2)
delayed_job_active_record (0.3.2)
alexvollmer-daemon-spawn (0.2.0)

I was having issues with daemons gem (1.0.10 basically kept spawning new workers and was unable to kill off old ones, 1.1.0+ just constantly threw broken pipe errors that I couldn't resolve)

The only thing I can see in my delayed_job.log is

 script/delayed_job:18: stack level too deep (SystemStackError)

pupeno commented May 14, 2012

I had this error with the following two lines in boot.rb:

require "yaml"
YAML::ENGINE.yamler = "syck"

pftg commented May 14, 2012

@pupeno please review my comment above. I have already described why this happen.

pftg commented May 14, 2012

@kaeus you see

script/delayed_job:18: stack level too deep (SystemStackError)

because you tried to serialize Mailer object without encode_with method.

We met the same problem.That is because we have a enqueue method in our delayed job object.
After do into the source code ,we found this would cause an cycle.so,rename it!

@bulanilly You + Google just saved me many many hours..

jamsi commented Jun 14, 2013

I had this issue recently when I rebuilt 1.9.2 with ssl. Upgrading to 1.9.3 worked, but does anybody know why?

dgaeta commented Jun 22, 2013

+1 @pftg

Your answer worked for me. Thanks!!

fro commented Jul 11, 2013

Upgrading to 1.9.3 worked for me either.

@pawel2105 pawel2105 referenced this issue in collectiveidea/delayed_job_mongoid Aug 23, 2013


Stack level too deep #21

On ruby-1.9.3-p392 and Rails 3.0.20 and delayed_job 3.0.5 the solution was @pftg's suggestion.

👍 💃

@albus522 albus522 closed this Sep 24, 2014

This should be written in bold:

If you have an #enqueue method in your job model, you'll get this error

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