New submission from Tom Karzes <[email protected]>:
If I create a sufficiently long chain of generators, I encounter a segmentation
fault. For example, the following works as expected:
% ./gen_bug3.py 10000
10000
%
But for sufficiently larger chain lengths, it seg faults:
% ./gen_bug3.py 20000
Segmentation fault (core dumped)
%
and:
% ./gen_bug3.py 100000
Segmentation fault (core dumped)
%
The exact point where it seg faults seems to vary slightly between different
invocations of Python, but the range is very narrow for a given Python
installation. I believe the difference is due to slight variations in used
memory upon startup.
I can't see any reason why this should happen, and in any case, if there is
some limit that I'm exceeding, it should raise an exception rather than core
dump.
I'm using:
3.6.9 (default, Jul 17 2020, 12:50:27)
[GCC 8.4.0]
on a 64-bit Ubuntu Linux system.
Additional info: A friend of mine is running 3.7.9 on a Windows system. In
his case, the symptom is that the program produces no output for a sufficiently
long generator chain (presumably it's silently crashing). Additionally, he
encounters the problem with much shorter generator chains than I do. I suspect
it's the same underlying problem.
----------
components: Interpreter Core
files: gen_bug3.py
messages: 377826
nosy: karzes
priority: normal
severity: normal
status: open
title: Long generator chain causes segmentation fault
type: crash
versions: Python 3.6
Added file: https://bugs.python.org/file49486/gen_bug3.py
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<https://bugs.python.org/issue41912>
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