_PylibMC_deserialize_native error on Arm (M1) with ubuntu 20.04/Python 2.7 when retrieving empty string value.

[BillRamsey-minted]

When setting a key as an empty string, I'm getting a core dump trying to retrieve the value. The error is:

>>> import pylibmc
>>> client = pylibmc.Client(["127.0.0.1"], binary=True, behaviors={"ketama": True})
>>> client.set("hi", "")
>>> client.get("hi")
python2.7: src/_pylibmcmodule.c:642: _PylibMC_deserialize_native: Assertion `value || value_str' failed.
Aborted

This happens on both Vagrant/Vmware Fusion and docker ubuntu 20.04 on my Apple M. This does not happen on x86.

The easiest way to reproduce is with Docker.

docker run -ti --rm ubuntu:20.04 /bin/bash

apt update
yes w | apt-get -y install python2-dev libmemcached-dev wget memcached build-essential libz-dev

wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
/bin/python2.7 get-pip.py

/etc/init.d/memcached start

pip install pylibmc==1.6.1

/bin/python2.7

>>> import pylibmc
>>> client = pylibmc.Client(["127.0.0.1"], binary=True, behaviors={"ketama": True})
>>> client.set("hi", "")
>>> client.get("hi")
python2.7: src/_pylibmcmodule.c:642: _PylibMC_deserialize_native: Assertion `value || value_str' failed.
Aborted

Really not sure where the root problem is here, or if its even a pylibmc issue. I've tried removing zlibc compression in the pip install, turning off binary. Super appreciate your work on this project, and if I'm in the wrong place, many apologies.

[BillRamsey-minted]

also, libmemcached-tools seem able to read it.

apt install libmemcached-tools

root@290b31153a34:/# memccat --servers localhost:11211 hi

root@290b31153a34:/#

and non empty strings are fine.

root@290b31153a34:/# /bin/python2.7
Python 2.7.18 (default, Jan 31 2024, 16:23:13)
[GCC 9.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pylibmc
>>> client = pylibmc.Client(["127.0.0.1"], binary=True, behaviors={"ketama": True})
>>> client.set("works", "yes")
True
>>> client.get("works")
'yes'