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AssertionError on python 2.7.9 in Werkzeug>=0.15.3 #1553

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DOlearczyk opened this issue May 20, 2019 · 4 comments

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@DOlearczyk
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commented May 20, 2019

When trying to create new flask object, I get following error:

>>> from flask import Flask
>>> flask_app = Flask(__name__)
python: /mnt/builds/jenkins-builds/workspace/pulsar-8/RC/icedge-apl-4/build-intel-apollolake/tmp/work/core2-64-wrs-linux/python/2.7.9-r1/Python-2.7.9/Python/symtable.c:1319: symtable_visit_params: Assertion `arg->v.Name.ctx == Param || (arg->v.Name.ctx == Store && !toplevel)' failed.
Aborted (core dumped)

This assertion error only shows up with Werkzeug version 0.15.3 and 0.15.4. It doesn't appear with version 0.15.2.

OS: Pulsar Linux 8.0.0.14
Python: 2.7.9
Flask: 1.0.2

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commented May 20, 2019

@asottile 😢

It's ridiculous that direct bytecode manipulation appears to be a more stable API than the AST above it.

@davidism

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commented May 20, 2019

@DOlearczyk we'll try to fix this, but you're very far behind on patch updates to Python 2.7. There is no easy way we can test on different patch versions of Python, so you're always running the risk of weird bugs in this case.

@davidism davidism added the bug label May 20, 2019

@davidism davidism added this to the 0.15.5 milestone May 20, 2019

@asottile

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commented May 20, 2019

I think I know how to fix this, but I'd like to reproduce it first, I tried with 2.7.9 but it doesn't trigger the assertion -- are you perchance using a debug build of python?

I guess I could follow my own docs for doing that 🤔

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commented May 20, 2019

(I spent a ton of time trying to compile 2.7.9 on bionic, but libssl is too new for such an old python version 😆 -- ended up resorting to docker, see #1554 for the fix)

@davidism davidism closed this May 21, 2019

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