Passenger 5.0.25 appears to Deadlock with threads using lib classes

[Jake LaCombe]

I have the following code in my rails application.

def fetch_data

  data = []

  threads = []

  threads << Thread.new do

    ::KcmoDatasets::Fake.new

  end

  threads.map(&:join)

  return data

end

module KcmoDatasets

  class Fake

    def initialize

    end

  end

end

The fake class is located in lib/kcmo_datasets/fake.rb, and the fetch_data method is inside a service object of app/services/data_fetcher.rb.

When I run the join command, the application appears to just hang. Anyone else have this issue?

[Daniel Knoppel]

I don't really think this sort of thing is related to Passenger, but it might be able to help you see what exactly is hanging with the backtrace feature: get the PID of the hanging process and send it a SIGQUIT signal. Passenger will then dump a backtrace to its logs.

- Daniel