Runtime Error: Can't start new thread about uvicorn-gunicorn-fastapi-docker

[jan180795]

i get the same error for all availabe versions that are not alpine when trying to build the image on my embedded linux machine on which i wanted to run the server:

Collecting pymongo (from -r requirements.txt (line 1))
  Obtaining dependency information for pymongo from https://files.pythonhosted.org/packages/77/c8/aa46a179d476a06630cf9a5463c5edc06b938fa8894b99194ebbdc775d76/pymongo-4.5.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata
  Downloading pymongo-4.5.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (22 kB)
Collecting python-dateutil>=2.7.0 (from -r requirements.txt (line 3))
  Downloading python_dateutil-2.8.2-py2.py3-none-any.whl (247 kB)
ERROR: Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/cli/base_command.py", line 180, in exc_logging_wrapper
    status = run_func(*args)
             ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/cli/req_command.py", line 248, in wrapper
    return func(self, options, args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/commands/install.py", line 377, in run
    requirement_set = resolver.resolve(
                      ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 92, in resolve
    result = self._result = resolver.resolve(
                            ^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/resolvelib/resolvers.py", line 546, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/resolvelib/resolvers.py", line 397, in resolve
    self._add_to_criteria(self.state.criteria, r, parent=None)
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/resolvelib/resolvers.py", line 173, in _add_to_criteria
    if not criterion.candidates:
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/resolvelib/structs.py", line 156, in __bool__
    return bool(self._sequence)
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
    return any(self)
           ^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
    return (c for c in iterator if id(c) not in self._incompatible_ids)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 47, in _iter_built
    candidate = func()
                ^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 206, in _make_candidate_from_link
    self._link_candidate_cache[link] = LinkCandidate(
                                       ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 293, in __init__
    super().__init__(
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 156, in __init__
    self.dist = self._prepare()
                ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 225, in _prepare
    dist = self._prepare_distribution()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 304, in _prepare_distribution
    return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/operations/prepare.py", line 538, in prepare_linked_requirement
    return self._prepare_linked_requirement(req, parallel_builds)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/operations/prepare.py", line 609, in _prepare_linked_requirement
    local_file = unpack_url(
                 ^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/operations/prepare.py", line 166, in unpack_url
    file = get_http_url(
           ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/operations/prepare.py", line 107, in get_http_url
    from_path, content_type = download(link, temp_dir.path)
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/network/download.py", line 147, in __call__
    for chunk in chunks:
  File "/usr/local/lib/python3.11/site-packages/pip/_internal/cli/progress_bars.py", line 52, in _rich_progress_bar
    with progress:
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/rich/progress.py", line 1169, in __enter__
    self.start()
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/rich/progress.py", line 1160, in start
    self.live.start(refresh=True)
  File "/usr/local/lib/python3.11/site-packages/pip/_vendor/rich/live.py", line 132, in start
    self._refresh_thread.start()
  File "/usr/local/lib/python3.11/threading.py", line 957, in start
    _start_new_thread(self._bootstrap, ())
RuntimeError: can't start new thread

It builds fine on my workstation so i assume it is hardware/os dependent.
I will update you when I find a way to it on my embedded linux machine

---

EDIT:
As i cannot change anything on the system it is supposed to run on, I have resorted to building the image elsewere and moving the build image over to the other machine to run it, which works without problems

This issue is most certainly related to docker and/or the operating system and not this image.
I unfortuanetly am not able to validate that myself, but every resource I looked at mentioned this as the most likely cause.