The Galera cluster locked up on one of the nodes. After this node was restarted, the rest of the cluster was unlocked. While it have happened with Galera, it feels more of MariaDB problem than a Galera problem.
Log from the affected node and config is attached (other nodes don't have anything interesting in the logs and the config is exactly the same).
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Bug
Major
MDEV-5216 5.5.34 merge
