I haven't found a way to reliably reproduce the error. It's only happened twice, and repeatedly running the tests that triggered it haven't reproduced it, yet. Unfortunately, those tests are integration tests with a proprietary system and I can't share the code (nor would it be very useful). It happens after many operations including creating mailing lists, sending messages through, moderating messages, etc. -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/856004 Title: "OperationalError: database is locked" encountered under very light load while using REST API To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/856004/+subscriptions