Boto3 causing segmentation fault

In some special circumstance, using boto3 will cause segmentation fault.

The code that can reproduce it is as follows. There are totally 3 files (and one subdirectory) need to be created because I am not able to reproduce it with only one file. You can also clone from https://github.com/JasonXJ/segmentation_fault_with_boto3

./mypackage/__init__.py:

import sys
import boto3

def foo():
    bar(boto3.resource('dynamodb', region_name='us-east-2'))
    sys.exit(0)  # Unable to reproduce without this line


# Unable to reproduce if merge this function with foo()
def bar(dynamodb):
    import mypackage.justtyping  # Unable to reproduce without this line

    # Unable to reproduce if do not get item twice, or use `dynamodb` in both
    # cases, or create new resource in both cases.
    # Note that the table must exist, but it does not need to have the item.
    dynamodb.Table('sigsegv').get_item(Key={'pkey': 'xxx'})
    boto3.resource('dynamodb', region_name='us-east-2').Table('sigsegv').get_item(Key={'pkey': 'xxx'})

./mypackage/justtyping.py

from typing import Sequence
x = Sequence['xxx']  # Unable to reproduce without this line, or replace string `'xxx'` with a class (e.g. `bytes`)

./run.py

import mypackage
mypackage.foo()

Run the code and get the segmentation fault:

$ python3 run.py
[1]    26495 segmentation fault (core dumped)  python3 run.py
FAIL

Versions: python 3.5.2, boto3 1.4.4, ubuntu 16.04.2

[kmurphy4]

FYI, this works for me in python 3.6.8, but not in python 3.7.3. Maybe this is worth reporting to python?

[anuj9196]

I’m also facing this issue. I’m using django-storages and files are being created in the S3 but while reading the file, it gives Segmentation fault (core dumped) error.