Mysql Workbench crashing when connecting
Looks like a known issue with it not handling an exception error properly and also the wrong version:
https://bugs.mysql.com/bug.php?id=79364

Description:
WB 6.3.5 (and also older release like 6.1.7) can connect to MariaDB.

&gt; How to repeat:
&gt; 1. Download WB 6.3.5 CE 64 bit (32 bit has the same issue)
&gt; 2. Download MariaDB 10.0.22 64 bit windows
&gt; 3. Start MariaDB using mysqld --console
&gt; 4. Create a new connection using WB : testing the connection works
&gt; 5. Connect to the database ( may or may not crash) : a SQL tab opens
&gt; 6. Connect to the same database : crashes : it says MySQL workbench has stopped working : a new SQL tab can not open

[20 Nov 2015 23:32] Godofredo Miguel Solorzano
Thank you for the bug report. Looks like you have the reason for in the log:

15:14:22 [ERR][      WBContext]: Unsupported server version: mariadb.org binary distribution 10.0.22-MariaDB


Are you using containers in your environment?

edit:
For now I solved it this way:from the menu Database => Manage Connections... I have created and saved the connection for the "test" user, so that it appears on the start screen ( when you launch WB, the saved connections appear as a list of gray buttons , and you can launch them directly from there).