Steve Stagg <[email protected]> added the comment:
(sorry for spam!)
So, this is a retained reference issue.
If I change the script to be this:
---
import gc
DEPTH = 100
def foo():
global DEPTH
try:
yield
except BaseException as e:
DEPTH -= 1
if DEPTH < 1:
return
gc.collect()
yield from foo()
def x():
for m in foo():
print(i)
try:
x()
except:
pass
ges = [o for o in gc.get_objects() if isinstance(o, GeneratorExit)]
if ges:
ge, = ges
print(gc.get_referrers(ge))
---
Then there's a reference to the GeneratorExit being retained (I guess from the
exception frames, althought I thought exception frames were cleared up these
days?):
[[GeneratorExit()], {'__name__': '__main__', '__doc__': None, '__package__':
None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at
0x7fac8899ceb0>, '__spec__': None, '__annotations__': {}, '__builtins__':
<module 'builtins' (built-in)>, '__file__': '/home/sstagg/tmp/fuzztest/tx.py',
'__cached__': None, 'gc': <module 'gc' (built-in)>, 'DEPTH': 99, 'foo':
<function foo at 0x7fac887dc5e0>, 'x': <function x at 0x7fac887dc700>, 'ges':
[GeneratorExit()], 'ge': GeneratorExit()}, <frame at 0x7fac8894d400, file
'/home/sstagg/tmp/fuzztest/tx.py', line 14, code foo>]
Exception ignored in: <generator object foo at 0x7fac88851740>
RuntimeError: generator ignored GeneratorExit.
Given the infinite loop happens during the finalization of the generator, I
think this reference is stopping the loop from going forever.
I tried removing the "as e" from the above script, and no references are
retained.
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue42762>
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