Public bug reported: I am seeing concurrency issues when using mailman 3 in a threaded application server. Reading the Storm documentation it states that "Store objects are not threadsafe. [...] Therefore, the best policy is usually to create a Store object for each thread which needs one" (https://storm.canonical.com/Manual#Working_with_multiple_threads) In mailman/database/base.py:141 I see a Store being created and cached. As recommended in the storm docs, Stores should not be cached. ** Affects: mailman Importance: Undecided Status: New -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1096812 Title: Threading issues in mailman 3.0.0b2 To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1096812/+subscriptions