See also: https://github.com/codership/galera/issues/447
Galera can mark user threads as high priority and so they can't be killed, the check is done in the same condition that checks the privileges for killing threads/queries and so the error message is the same, which in case of galera unkillable thread is misleading "You are not the owner of the thread .... " even if you are the owner or a fully privileged user.
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Critical
Fix merged with the head revision: https://github.com/MariaDB/server/commit/1001dae186d17e89e78a5596f1076cdda6467785