thin stop times out and fails

Repro:

• Install ruby 1.9.1p129 (2009-05-12 revision 23412) and thin 1.2.1 on Ubuntu 8.04 LTS
• Write a hello-world rackup file and save as hello_world.ru

app = proc do |env|
 [
  200,
  {
    'Content-Type' => 'text/html',
    'Content-Length' => '2'
  },
  ['hi']
 ]
end

run app

• Start a cluster of thin processes: "thin start -s 3 -R hello_world.ru"
• Now try to stop them: "thin stop -s 3"

Results:

Stopping server on 0.0.0.0:3000 ... 
Sending QUIT signal to process 31975 ... 
Timeout!
Stopping server on 0.0.0.0:3001 ... 
Sending QUIT signal to process 31988 ... 
Timeout!
Stopping server on 0.0.0.0:3002 ... 
Sending QUIT signal to process 32001 ... 
Timeout!

thin processes are still running.

the thin processes aren't responsive to a regular "kill ", either.
However, if I load from their respective ports, they process the quit request and exit. That is, if, while "thin stop" is trying to stop the port-3000 daemon, I do an HTTP load against port 3000, the process will exit. Without the load, the process will run forever.

Expect: thin processes are responsive to quit requests.

If you have difficulty reproducing the issue let me know how to take additional traces.