Dangerous Edge Case in Percona Toolkit with pt-online-schema-change

This bug applies only to Percona Toolkit versions up to 3.0.10, so if you have already 3.0.11 or newer installed, you can skip the rest of this post as these are no longer affected. See details at:

Dangerous Edge Case Warning for Percona Toolkit and pt-online-schema-change - Percona Database Performance Blog