Sidekiq: Jobs stuck in busy after updating to rails 6

[awadhwana]

Ruby version: 2.5.3
Sidekiq version: 5.2.7
Redis version=4.0.14
Running in standalone mode
Port: 6379
PID: 840

# config/initializers/sidekiq.rb

Sidekiq.configure_server do |config|
  config.redis = { url: 'redis://localhost:6379/0', namespace: "my_namespace_sidekiq#{Rails.env}" }
end

Sidekiq.configure_client do |config|
  config.redis = { url: 'redis://localhost:6379/0', namespace: "my_namespace_sidekiq_#{Rails.env}" }
end

Recently upgraded to rails 6 and now my jobs passes through enqueued and are stuck in busy, both the queues: default, mailers have be defined.
The process is also started.

I also tried upgrading to Sidekiq version: 6, but even that didn't help

[fmluizao]

Maybe you are using 'classic' autoloader?

Happened to me too...

[ronval]

I was having this issue as well it turned out to be my application.rb file
I had config.load_defaults 5.2

I changed that to config.load_defaults 6.0

It fixed the jobs getting stuck on busy. Hope that helps someone.