gevent_crash_tuple.py

# This causes Python to crash with 
# `SystemError: Objects/tupleobject.c:851: bad argument to internal function`
# within a few hundered iterations at most. Typically only a handful are needed though.
# Most likely reason is: https://bugs.python.org/issue15108

from io import StringIO

import gevent


gevent.config.monitor_thread = True
# Silence monitor output
gevent.get_hub().exception_stream = StringIO()


def worker():
    i = 0
    while True:
        tuple(j for j in range(5000000))
        i += 1
        print(i)


gevent.spawn(worker).join()

Traceback:

Traceback (most recent call last):
  File "/Users/ulo/t/gevent_crash_tuple.py", line 24, in <module>
    gevent.spawn(worker).join()
  File "src/gevent/greenlet.py", line 661, in gevent._greenlet.Greenlet.join
  File "src/gevent/greenlet.py", line 687, in gevent._greenlet.Greenlet.join
  File "src/gevent/greenlet.py", line 676, in gevent._greenlet.Greenlet.join
  File "src/gevent/_greenlet_primitives.py", line 59, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
  File "src/gevent/_greenlet_primitives.py", line 63, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
  File "src/gevent/__greenlet_primitives.pxd", line 35, in gevent.__greenlet_primitives._greenlet_switch
SystemError: Objects/tupleobject.c:851: bad argument to internal function