Issue 1:
Checklist

I have verified that the issue exists against the master branch of Celery.

This has already been asked to the discussion group first. (No option to post for me)

I have read the relevant section in the

contribution guide

on reporting bugs.

I have checked the issues list

for similar or identical bug reports.

I have checked the pull requests list

for existing proposed fixes.

I have checked the commit log

to find out if the bug was already fixed in the master branch.

I have included all related issues and possible duplicate issues

in this issue (If there are none, check this box anyway).

Mandatory Debugging Information

I have included the output of celery -A proj report in the issue.

(if you are not able to do this, then at least specify the Celery

version affected). - Celery 4.4.0 (cliffs)

I have verified that the issue exists against the master branch of Celery.

I have included the contents of pip freeze in the issue.

I have included all the versions of all the external dependencies required

to reproduce this bug.

Optional Debugging Information

I have tried reproducing the issue on more than one Python version

and/or implementation.

I have tried reproducing the issue on more than one message broker and/or

result backend.

I have tried reproducing the issue on more than one version of the message

broker and/or result backend.

I have tried reproducing the issue on more than one operating system.

I have tried reproducing the issue on more than one workers pool.

I have tried reproducing the issue with autoscaling, retries,

ETA/Countdown & rate limits disabled.

I have tried reproducing the issue after downgrading

and/or upgrading Celery and its dependencies. Works in Celery 4.1

Related Issues and Possible Duplicates

Related Issues

None

Possible Duplicates

None

Environment & Settings

Celery version 4.4.0 (cliffs):

celery report Output:

Steps to Reproduce

sig = signature('any_taskname', queue='any_q')
chain( [ chain( sig ) ] ).apply_async()

Required Dependencies

Minimal Python Version: 2.7

Minimal Celery Version: 4.4

Minimal Kombu Version: 4.6.7

Minimal Broker Version: N/A

Minimal Result Backend Version: N/A

Minimal OS and/or Kernel Version: N/A

Minimal Broker Client Version: N/A

Minimal Result Backend Client Version: N/A

Python Packages

pip freeze Output:

Other Dependencies

N/A

Minimally Reproducible Test Case

sig = signature('any_taskname', queue='any_q')
chain( [ chain( sig ) ] ).apply_async()

Expected Behavior

It should publish task 'any_taskname' to queue 'any_q'

Actual Behavior

Max recursion depth exceeded

Traceback (most recent call last):
File "test.py", line 30, in <module>
chain([chain(s2)]).apply_async() # issue
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 642, in apply_async
dict(self.options, **options) if options else self.options))
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 660, in run
task_id, group_id, chord,
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 721, in prepare_steps
task = task.clone(args, kwargs)
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 620, in clone
for sig in signature.kwargs['tasks']
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 1513, in maybe_signature
d = d.clone()
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 620, in clone
for sig in signature.kwargs['tasks']
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 1513, in maybe_signature
d = d.clone()
...
..
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 620, in clone
for sig in signature.kwargs['tasks']
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 1513, in maybe_signature
d = d.clone()
keeps repeating
..
..
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 617, in clone
signature = Signature.clone(self, *args, **kwargs)
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 272, in clone
app=self._app)
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 153, in from_dict
return target_cls.from_dict(d, app=app)
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 599, in from_dict
return _upgrade(d, _chain(tasks, app=app, **d['options']))
File "/bb/bin/dl/celery/4.4/celery/canvas.py", line 602, in __init__
tasks = (regen(tasks[0]) if len(tasks) == 1 and is_list(tasks[0])
File "/bb/bin/dl/celery/4.4/kombu/utils/functional.py", line 256, in is_list
return isinstance(l, iters) and not isinstance(l, scalars or ())
File "/opt/bb/lib/python2.7/abc.py", line 132, in __instancecheck__
if subclass is not None and subclass in cls._abc_cache:
File "/opt/bb/lib/python2.7/_weakrefset.py", line 72, in __contains__
wr = ref(item)
RuntimeError: maximum recursion depth exceeded

Issue 2:
Checklist

I have verified that the issue exists against the master branch of Celery.

This has already been asked to the discussion group first.

I have read the relevant section in the

contribution guide

on reporting bugs.

I have checked the issues list

for similar or identical bug reports.

I have checked the pull requests list

for existing proposed fixes.

I have checked the commit log

to find out if the bug was already fixed in the master branch.

I have included all related issues and possible duplicate issues

in this issue (If there are none, check this box anyway).

Mandatory Debugging Information

I have included the output of celery -A proj report in the issue.

(if you are not able to do this, then at least specify the Celery

version affected).

I have verified that the issue exists against the master branch of Celery.

I have included the contents of pip freeze in the issue.

I have included all the versions of all the external dependencies required

to reproduce this bug.

Optional Debugging Information

I have tried reproducing the issue on more than one Python version

and/or implementation.

I have tried reproducing the issue on more than one message broker and/or

result backend.

I have tried reproducing the issue on more than one version of the message

broker and/or result backend.

I have tried reproducing the issue on more than one operating system.

I have tried reproducing the issue on more than one workers pool.

I have tried reproducing the issue with autoscaling, retries,

ETA/Countdown & rate limits disabled.

I have tried reproducing the issue after downgrading

and/or upgrading Celery and its dependencies.

Related Issues and Possible Duplicates

Related Issues

Introduced by 0463bff

#6122

Possible Duplicates

None

Environment & Settings

Celery version: 4.4.4

celery report Output:

Steps to Reproduce

Upgrade from Celery 4.4.3 to 4.4.4

Get ModuleNotFoundError: No module named 'future' eror

Required Dependencies

Minimal Python Version: N/A or Unknown

Minimal Celery Version: N/A or Unknown

Minimal Kombu Version: N/A or Unknown

Minimal Broker Version: N/A or Unknown

Minimal Result Backend Version: N/A or Unknown

Minimal OS and/or Kernel Version: N/A or Unknown

Minimal Broker Client Version: N/A or Unknown

Minimal Result Backend Client Version: N/A or Unknown

Python Packages

pip freeze Output:

Other Dependencies

N/A

Minimally Reproducible Test Case

Expected Behavior

It would work after upgrade. In case new dependencies were introduced, these should be installed.

Actual Behavior

weblate_1 | File "/usr/local/lib/python3.7/dist-packages/celery/backends/redis.py", line 25, in <module>
weblate_1 | from .base import BaseKeyValueStoreBackend
weblate_1 | File "/usr/local/lib/python3.7/dist-packages/celery/backends/base.py", line 10, in <module>
weblate_1 | from future.utils import raise_with_traceback
weblate_1 | ModuleNotFoundError: No module named 'future'

See https://github.com/WeblateOrg/docker/runs/733499300