gunicorn cannot run in python 3.10 with gevent = "21.8.0"

[ipomoealba]

Hi all,

We encounter the following errors when we try to upgrade our python environment.

• env: docker.io/python:3.10.0-slim-bullseye
• gunicorn version: "20.1.0"
• gevent version: "21.8.0"

We start gunicorn by the command:

gunicorn {{ .Values.flask_app }} --workers "3" --worker-class gevent --bind "[::]:5000" --threads "4" --timeout "300"

Error logs

[2021-11-01 03:59:04 +0000] [6] [WARNING] Worker with pid 9 was terminated due to signal 15
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 209, in run
    self.sleep()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 357, in sleep
    ready = select.select([self.PIPE[0]], [], [], 1.0)
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 242, in handle_chld
    self.reap_workers()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 525, in reap_workers
    raise HaltServer(reason, self.WORKER_BOOT_ERROR)
gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/gunicorn", line 8, in <module>
    sys.exit(run())
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 67, in run
    WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/base.py", line 231, in run
    super().run()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/app/base.py", line 72, in run
    Arbiter(self).run()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 229, in run
    self.halt(reason=inst.reason, exit_status=inst.exit_status)
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 342, in halt
    self.stop()
  File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 393, in stop
    time.sleep(0.1)

Could anyone help to check gunicorn can run with gevent with python 3.10? Thanks!

[salty-horse]

Works fine for me with gunicorn 20.1.0 and gevent 21.12.0

Is this the only error you're seeing? Does your app work on its own?

[khayitov-dev]

wdq

[benoitc]

note to self: test minimal required version of gevent.

[tilgovi]

No followup here. If anyone wants to test versions of gevent and open a PR to document or require minimum versions, that would be useful, but other folks here are reporting that this version does work.