Error in greenlet with Python 3.9.0 on macOS: TypeError: type() takes 1 or 3 arguments

[fxcoudert]

Describe the bug
We're testing the migration of gdb and gdbgui to Python 3.9.0 as part of Homebrew: Homebrew/homebrew-core#62792

To Reproduce
Launch gdbgui and connect to it (see below).

Error

==> /usr/local/Cellar/gdbgui/0.14.0.1_1/bin/gdbgui -v
==> curl -s 127.0.0.1:51050
Traceback (most recent call last):
  File "/usr/local/Cellar/gdbgui/0.14.0.1_1/libexec/lib/python3.9/site-packages/gevent/baseserver.py", line 246, in _do_read
    self.do_handle(*args)
  File "/usr/local/Cellar/gdbgui/0.14.0.1_1/libexec/lib/python3.9/site-packages/gevent/baseserver.py", line 208, in do_handle
    spawn(_handle_and_close_when_done, handle, close, args)
  File "src/gevent/greenlet.py", line 662, in gevent._greenlet.Greenlet.spawn
TypeError: type() takes 1 or 3 arguments
2020-10-13T09:44:35Z ((('127.0.0.1', 51051),), <WSGIServer at 0x105f15a00 fileno=5 address=127.0.0.1:51050>) failed with TypeError

Please complete the following information:

• OS: macOS 10.13 to 10.15
• gdbgui version (gdbgui -v): 0.14.0.1
• gdb version (gdb -v): 9.2

[ksherlock]

This line in gevent:

https://github.com/gevent/gevent/blob/18365b99bb458261e04b0e36bf8b57926e9ae194/src/gevent/greenlet.py#L1131

might be the issue.

in gevent/baseserver.py:

with acceleration:

• Greenlet: <class 'gevent._greenlet.Greenlet'>
• Greenlet.spawn: <bound method Greenlet.spawn of <class 'type'>>

without acceleration:

• Greenlet: <class 'gevent.greenlet.Greenlet'>
• Greenlet.spawn: <bound method Greenlet.spawn of <class 'gevent.greenlet.Greenlet'>>

setting the PURE_PYTHON=1 environment variable skips the accelerator stuff so it can be run that way as well.

[ryanfuji]

export PURE_PYTHON=1, fixed the issue for me
Catalina 10.15.7
Python 3.9
GDB 10.2
gdbgui 0.14

[denysvitali]

Indeed, export PURE_PYTHON=1 solves the issue for me too:

$ gdbgui -v
0.14.0.1
$ python --version
Python 3.9.1
$ cat /etc/os-release | head -n1 | cut -f 2 -d = | sed 's/"//g'
Arch Linux

[callahanp]

adding export PURE_PYTHON=1 solves the issue on Lubuntu 21.04

Lubuntu 21.04
Python 3.9.4
pip 20.3.4 from /usr/lib/python3/dist-packages/pip (python 3.9)
pipx 0.16.2.1
gdbgui 0.14.0.2

[1Mark]

PURE_PYTHON=1 gdbgui or gdbgui --debug both work for me, but this really should be fixed.

[cs01]

Pull requests are welcome

[Igosuki]

Same thing on Linux Ubuntu 21.04

[bryanmobrien]

Same (PURE_PYTHON=1 gdbgui "works") on:
macOS Big Sur 11.5.2
python 3.9.5
pip 21.2.4
gdbgui 0.14.0.2

[cs01]

eventlet and gevent have been removed as dependencies. This should work fine now in v0.15. Thanks everyone for reporting.