How to reproduce the behaviour

Follow the instructions to run doccano using docker, as instructed at https://doccano.github.io/doccano/getting-started/docker, and after a while, container is stopped due to potential memory leak.

Your Environment

• Operating System: Ubuntu 16.04 (base OS), not sure about docker version
• Python Version Used: 3.8 (in docker), 3.5 (in base OS)
• RAM: 4 GB
• When you install doccano: Installation and running doccano works fine; but following message is found in docker logs -f doccano:

WARNING/MainProcess] /usr/local/lib/python3.8/site-packages/celery/fixups/django.py:203: UserWarning: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!

After a while, doccano is stopped with following message in log:

/doccano/tools/run.sh: fork: Cannot allocate memory

• How did you install doccano (Heroku button etc): Using docker as outlined at https://doccano.github.io/doccano/getting-started/#docker