https://github.com/lefterisjp/geventpywsgibug

Potential bug in gevent pywsgi
https://github.com/lefterisjp/geventpywsgibug

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Potential bug in gevent pywsgi

• Host: GitHub
• URL: https://github.com/lefterisjp/geventpywsgibug
• Owner: LefterisJP
• Created: 2019-01-07T10:25:50.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2019-01-07T12:27:11.000Z (almost 6 years ago)
• Last Synced: 2024-10-06T20:41:08.883Z (about 1 month ago)
• Language: Python
• Size: 4.88 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
## Potential bug in gevent pywsgi

### Reproduction

```

$ pip install -r requirements.txt

$ python -m example

```

### Result

This minimal example in the repo crashes with a core dump whenever there is any kind of exception thrown in the WSGIServer logic.

The stack overflow looks like this:

https://gist.github.com/LefterisJP/7da6ee215160915de8eddc8c7e181a78

It seems like a logging error that causes a stack overflow and ends up segfaulting the interpreter.

Indeed if in the `start()` function we don't provide the `error_log` argument:

https://github.com/LefterisJP/geventpywsgibug/blob/1bd50adb94c14e5e1eae4d361862c9ff5ac41480/example/api.py#L48-L52

Then we get the expected behaviour:

```$ python -m example

[2019-01-07 11:39:13,157] ERROR in app: Exception on /api/1/test_case [GET]

Traceback (most recent call last):

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/flask/app.py", line 1612, in full_dispatch_request

    rv = self.dispatch_request()

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/flask/app.py", line 1598, in dispatch_request

    return self.view_functions[rule.endpoint](**req.view_args)

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/flask_restful/__init__.py", line 480, in wrapper

    resp = resource(*args, **kwargs)

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/flask/views.py", line 84, in view

    return self.dispatch_request(*args, **kwargs)

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/flask_restful/__init__.py", line 595, in dispatch_request

    resp = meth(*args, **kwargs)

  File "/home/lefteris/.virtualenvs/wsgicrash/lib/python3.7/site-packages/webargs/core.py", line 449, in wrapper

    return func(*args, **kwargs)

  File "/home/lefteris/w/pythonbug_reproduction/example/v1/resources.py", line 24, in get

    return self.rest_api.test_case(**kwargs)

  File "/home/lefteris/w/pythonbug_reproduction/example/api.py", line 66, in test_case

    raise ValueError('This will trigger stack overflow error and segfault python interpreter')

ValueError: This will trigger stack overflow error and segfault python interpreter

127.0.0.1 - - [2019-01-07 11:39:13] "GET /api/1/test_case HTTP/1.1" 500 164 0.001653

Finished succesfully

```