TypeError: cannot pickle '_thread._local' object

[y-Adrian]

Describe the bug
When I use the command codechecker server I got this error. Here are the details:

[INFO 2022-02-24 18:34] - Checking configuration database ...
[INFO 2022-02-24 18:34] - Database is up to date.
[INFO 2022-02-24 18:34] - Status of products:
-------------------------------------------------------------------------------------------------------------------------------------------------------
Product endpoint | Database status         | Database location                         | Schema version in the database | Schema version in the package
-------------------------------------------------------------------------------------------------------------------------------------------------------
Default          | Database is up to date. | /Users/debris/.codechecker/Default.sqlite | fb356f0eefed (up to date)      | fb356f0eefed                 
-------------------------------------------------------------------------------------------------------------------------------------------------------
[INFO 2022-02-24 18:34] - Garbage collection for product 'Default' started...
[INFO 2022-02-24 18:34] - Garbage collection finished.
[INFO 2022-02-24 18:34] - Searching for SSL key at /Users/debris/.codechecker/key.pem, cert at /Users/debris/.codechecker/cert.pem, not found...
[INFO 2022-02-24 18:34] - Falling back to simple, insecure HTTP.
[INFO 2022-02-24 18:34] - Server waiting for client requests on [localhost:8001]
Traceback (most recent call last):
  File "/Users/debris/miniconda3/lib/python3.8/site-packages/codechecker_common/cli.py", line 208, in main
    sys.exit(args.func(args))
  File "/Users/debris/miniconda3/lib/python3.8/site-packages/codechecker_server/cmd/server.py", line 436, in __handle
    main(args)
  File "/Users/debris/miniconda3/lib/python3.8/site-packages/codechecker_server/cmd/server.py", line 1002, in main
    server_init_start(args)
  File "/Users/debris/miniconda3/lib/python3.8/site-packages/codechecker_server/cmd/server.py", line 972, in server_init_start
    server.start_server(args.config_directory,
  File "/Users/debris/miniconda3/lib/python3.8/site-packages/codechecker_server/server.py", line 1092, in start_server
    p.start()
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/context.py", line 284, in _Popen
    return Popen(process_obj)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 32, in __init__
    super().__init__(process_obj)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/popen_fork.py", line 19, in __init__
    self._launch(process_obj)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 47, in _launch
    reduction.dump(process_obj, fp)
  File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_thread._local' object

CodeChecker version
6.18.0

To Reproduce
Steps to reproduce the behaviour:

1. Run command 'codechecker server'
2. See error

Expected behaviour
I want to start the service and visit the webpage of codechecker through typing http://localhost:8001 in my browser.

Desktop (please complete the following information)

• OS: macOS Big Sur Version 11.4
• Browser: Chrome

Additional context
I install the codechecker through the command pip install codechecker according to here
The version of pip :
->pip -V
pip 21.3.1 from /opt/homebrew/lib/python3.9/site-packages/pip (python 3.9)

[y-Adrian]

There seems something wrong with the _Popen function in File "/Users/debris/miniconda3/lib/python3.8/multiprocessing/process.py" at line 77:

def _Popen(self):
    raise NotImplementedError

But I don't know how to fix it

[MisterMartin]

I encountered the same error on MacOS Monterey. Was able to get the server to run by using python3.7.

[whisperity]

@y-Adrian @MisterMartin Could you please retry using a newer CodeChecker version? We have recently changed multiprocessing-related library in 6.23: #4076, #4118.