RuntimeError: threads can only be started once

Expected behaviour:

While daemon running, I should still be able to run a manual execution.

Actual behaviour:

It's seeing process is there but crashes because of Runtime error regards threads.

Steps to reproduce:

Step 1: start daemon flexget daemon start -d
Step 2: run standard execution flexget execute --verbose

Log:

There is a FlexGet process already running for this config, sending execution there.
Traceback (most recent call last):
  File "/opt/bin/flexget", line 11, in <module>
    sys.exit(main())
  File "/opt/lib/python3.5/site-packages/flexget/__init__.py", line 42, in main
    manager.start()
  File "/opt/lib/python3.5/site-packages/flexget/manager.py", line 294, in start
    client.handle_cli(self.args)
  File "/opt/lib/python3.5/site-packages/rpyc/core/netref.py", line 196, in __call__
    return syncreq(_self, consts.HANDLE_CALL, args, kwargs)
  File "/opt/lib/python3.5/site-packages/rpyc/core/netref.py", line 71, in syncreq
    return conn.sync_request(handler, oid, *args)
  File "/opt/lib/python3.5/site-packages/rpyc/core/protocol.py", line 441, in sync_request
    raise obj
RuntimeError: threads can only be started once

========= Remote Traceback (1) =========
Traceback (most recent call last):
  File "/opt/lib/python3.5/site-packages/rpyc/core/protocol.py", line 305, in _dispatch_request
    res = self._HANDLERS[handler](self, *args)
  File "/opt/lib/python3.5/site-packages/rpyc/core/protocol.py", line 535, in _handle_call
    return self._local_objects[oid](*args, **dict(kwargs))
  File "/opt/lib/python3.5/site-packages/flexget/ipc.py", line 80, in exposed_handle_cli
    self.manager.handle_cli(options)
  File "/opt/lib/python3.5/contextlib.py", line 77, in __exit__
    self.gen.throw(type, value, traceback)
  File "/opt/lib/python3.5/site-packages/flexget/logger.py", line 88, in capture_output
    yield
  File "/opt/lib/python3.5/site-packages/flexget/ipc.py", line 80, in exposed_handle_cli
    self.manager.handle_cli(options)
  File "/opt/lib/python3.5/site-packages/flexget/manager.py", line 333, in handle_cli
    self.execute_command(command_options)
  File "/opt/lib/python3.5/site-packages/flexget/manager.py", line 365, in execute_command
    self.task_queue.start()
  File "/opt/lib/python3.5/site-packages/flexget/task_queue.py", line 35, in start
    self._thread.start()
  File "/opt/lib/python3.5/threading.py", line 840, in start
    raise RuntimeError("threads can only be started once")
RuntimeError: threads can only be started once

Additional information:

Flexget Version: 2.1.1
Python Version: 3.5
Installation method: pip install
OS and version: Android 4.4 AMLogic s805

I've got the same error message;

There is a FlexGet process already running for this config, sending execution there.
Traceback (most recent call last):
File "./bin/flexget", line 11, in
sys.exit(main())
File "/opt/local/lib/python3.5/site-packages/flexget/init.py", line 42, in main
manager.start()
File "/opt/local/lib/python3.5/site-packages/flexget/manager.py", line 295, in start
client.handle_cli(self.args)
File "/opt/local/lib/python3.5/site-packages/rpyc/core/netref.py", line 196, in call
return syncreq(_self, consts.HANDLE_CALL, args, kwargs)
File "/opt/local/lib/python3.5/site-packages/rpyc/core/netref.py", line 71, in syncreq
return conn.sync_request(handler, oid, *args)
File "/opt/local/lib/python3.5/site-packages/rpyc/core/protocol.py", line 441, in sync_request
raise obj
RuntimeError: threads can only be started once

========= Remote Traceback (1) =========
Traceback (most recent call last):
File "/opt/local/lib/python3.5/site-packages/rpyc/core/protocol.py", line 305, in _dispatch_request
res = self._HANDLERS[handler](self, *args)
File "/opt/local/lib/python3.5/site-packages/rpyc/core/protocol.py", line 535, in _handle_call
return self._local_objects[oid](*args, **dict%28kwargs%29)
File "/opt/local/lib/python3.5/site-packages/flexget/ipc.py", line 81, in exposed_handle_cli
self.manager.handle_cli(options)
File "/opt/local/lib/python3.5/contextlib.py", line 77, in exit
self.gen.throw(type, value, traceback)
File "/opt/local/lib/python3.5/site-packages/flexget/logger.py", line 83, in capture_output
yield
File "/opt/local/lib/python3.5/site-packages/flexget/ipc.py", line 81, in exposed_handle_cli
self.manager.handle_cli(options)
File "/opt/local/lib/python3.5/site-packages/flexget/manager.py", line 334, in handle_cli
self.execute_command(command_options)
File "/opt/local/lib/python3.5/site-packages/flexget/manager.py", line 366, in execute_command
self.task_queue.start()
File "/opt/local/lib/python3.5/site-packages/flexget/task_queue.py", line 36, in start
self._thread.start()
File "/opt/local/lib/python3.5/threading.py", line 840, in start
raise RuntimeError("threads can only be started once")
RuntimeError: threads can only be started once

try running

flexget --verbose execute

See if it still crashes.

With that I get:

$ flexget --verbose execute
There is a FlexGet process already running for this config, sending execution there.
usage: flexget [-h] [-V] [--test] [-c CONFIG] [--logfile LOGFILE]
               [--loglevel LEVEL] [--bugreport] [--profile [OUTFILE]] [--cron]
               [--debug-db-sessions] [--debug-warnings]
               <command> ...
flexget: error: unrecognized arguments: --verbose

Assuming you meant "flexget execute --verbose", it makes no difference. Still crashes with "RuntimeError: threads can only be started once" and no additional detail. Also same result with latest version 2.3.27.

I have this issue as well. Running 2.3.41 with Python3

@gazpachoking

@gazpachoking any clue?

It seems to be something related to Python3 - I reverted back to Python27 and i'm not having this issue anymore.

Still occurring running 2.3.42 and Python 3.5.1, while in daemon. Running flexget execute with any flags or none.

Sometimes I restart and the problem goes away...hmm

So, do any of you have any other errors before this? It looks like somehow one of the threads the daemon is supposed to be running has died at some point before you get the posted error message. I'm interested if we can get to the bottom of why that thread died.

Merge pull request #1472 from cvium/fix_task_queue_crash

Where would I look to find these other errors? My flexget.log just has normal stuff in it.

Can say using flexget 2.5.19 and not seeing this error

That's not too surprising since I fixed the crash, but there's still the underlying issue of the task queue thread dying unexpectedly.

Look in your logs for an ERROR with the text Task queue has died unexpectedly. Restarting it

Don't see that error in my logs.

Haven't seen any action here, hoping this is squashed.

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RuntimeError: threads can only be started once #1254

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RuntimeError: threads can only be started once #1254

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Expected behaviour:

Actual behaviour:

Steps to reproduce:

Log:

Additional information:

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orlandosantos commented on Aug 10, 2016

crawln45 commented on Aug 12, 2016

jordanade commented on Sep 9, 2016

jordanade commented on Sep 16, 2016

xmun2k commented on Oct 6, 2016

liiight commented on Oct 6, 2016

xmun2k commented on Oct 6, 2016

fabrizio5680 commented on Oct 19, 2016

jordanade commented on Oct 19, 2016

gazpachoking commented on Nov 2, 2016

jordanade commented on Nov 4, 2016

fabrizio5680 commented on Nov 14, 2016

cvium commented on Nov 14, 2016

jordanade commented on Dec 10, 2016

gazpachoking commented on Jan 15, 2019

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