I am getting this error in a lot of DAGs that seem very random. The full trace of the error is:
```
Traceback (most recent call last):
[2021-08-11 09:29:19,497]  INFO -   File "/home/***/.local/lib/python3.8/site-packages/MySQLdb/__init__.py", line 18, in <module>
[2021-08-11 09:29:19,498]  INFO -     from . import _mysql
[2021-08-11 09:29:19,499]  INFO - ImportError: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: cannot allocate memory in static TLS block
[2021-08-11 09:29:19,500]  INFO - 
[2021-08-11 09:29:19,501]  INFO - During handling of the above exception, another exception occurred:
[2021-08-11 09:29:19,502]  INFO - 
[2021-08-11 09:29:19,503]  INFO - Traceback (most recent call last):
[2021-08-11 09:29:19,504]  INFO -   File "/opt/***/dags/import_apple_app_store/py_s3_apple.py", line 7, in <module>
[2021-08-11 09:29:19,505]  INFO -     from ***.models import Variable
[2021-08-11 09:29:19,506]  INFO -   File "/home/***/.local/lib/python3.8/site-packages/***/__init__.py", line 46, in <module>
[2021-08-11 09:29:19,506]  INFO -     settings.initialize()
[2021-08-11 09:29:19,507]  INFO -   File "/home/***/.local/lib/python3.8/site-packages/***/settings.py", line 445, in initialize
[2021-08-11 09:29:19,508]  INFO -     configure_adapters()
[2021-08-11 09:29:19,508]  INFO -   File "/home/***/.local/lib/python3.8/site-packages/***/settings.py", line 325, in configure_adapters
[2021-08-11 09:29:19,509]  INFO -     import MySQLdb.converters
[2021-08-11 09:29:19,510]  INFO -   File "/home/***/.local/lib/python3.8/site-packages/MySQLdb/__init__.py", line 24, in <module>
[2021-08-11 09:29:19,510]  INFO -     version_info, _mysql.version_info, _mysql.__file__
[2021-08-11 09:29:19,511]  INFO - NameError: name '_mysql' is not defined
[2021-08-11 09:29:19,647] {python_file_operator.py:118} INFO - Command exited with return code 1
```

Characteristics:

- Official Docker image apache/airflow:2.1.2.
- I add to the official image the following:
`  RUN sudo apt-get update && sudo apt-get install -y build-essential gconf-service libasound2 libatk1.0-0 libcairo2 libcups2 libfontconfig1 libgdk-pixbuf2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libxss1 fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget libappindicator3-1 libgbm1`
- Also I have a requirements file. The only mysql-related library is the provider one. 
- Prod env in an Ubuntu 18.04 AWS EC2 of 128GB RAM
- Local env MacOS 10GB allocated to Docker. I have this parameter in the docker-compose   `AIRFLOW__OPERATORS__DEFAULT_RAM: 2048`
- All errors occurred in python scripts executed by BashOperators
- All errors happen during the imports, not even a single line of code after the imports is executed
- No DAGs with the error uses any MySql library


First, in prod, with Python 3.6, I had the error on several DAGs (let's say DAGs A and B worked, and C and D did not). In both A and B, there was a common point, importing Variable before SnowflakeHook. So the code was:

```
from snowflake_hook import SnowflakeHook (this file does NOT make use of Variable anywhere in the code)
from airflow.models import Variable
```
And changing the order solved the problem:
```
from airflow.models import Variable
from snowflake_hook import SnowflakeHook
```

Now, in local, I was testing updating the python version using the official images. Starting from Python 3.9, suddenly, the dag A, which was already fixed in prod, stopped working. 

Then I change to Python 3.8 and the dag A starts working again. However, dag C, which never had a problem, start failing with the same error. In this case, there were no import of SnowflakeHook, just common python libraries imports. Anyway, I change the code from:

```
import logging
import pandas as pd
import requests

from airflow.models import Variable
```

to 
```
from airflow.models import Variable

import logging
import pandas as pd
import requests
```
And it works. 

Furthermore, dag D, which also didn't have a problem, fails also. I try to change the orders of the imports, and in this case, it does not work. At the time of failing, there were only 5 dags active and just 1 of them (light one) running, so it does not seem to be a RAM problem. 

So I am very lost about how to deal with this error. The docker-compose is very similar to the one in the official docs. 
airflow/settings.py
"""
    This setting allows altering task instances before they are queued by
    the Airflow scheduler.
    To define task_instance_mutation_hook, add a ``airflow_local_settings`` module
    to your PYTHONPATH that defines this ``task_instance_mutation_hook`` function.
    This could be used, for instance, to modify the task instance during retries.
    :param task_instance: task instance to be mutated
    :type task_instance: airflow.models.taskinstance.TaskInstance
    """
def pod_mutation_hook(pod):
    """
    This setting allows altering ``kubernetes.client.models.V1Pod`` object
    before they are passed to the Kubernetes client by the ``PodLauncher``
    for scheduling.
    To define a pod mutation hook, add a ``airflow_local_settings`` module
    to your PYTHONPATH that defines this ``pod_mutation_hook`` function.
    It receives a ``Pod`` object and can alter it where needed.
    This could be used, for instance, to add sidecar or init containers
    to every worker pod launched by KubernetesExecutor or KubernetesPodOperator.
    """
def configure_vars():