run sequence nextval got [Note] WSREP: MDL BF-BF conflict and [ERROR] Aborting

Hi,

Our Galera cluster architecture is 2 DB nodes + 1 witness node. Most DB traffic is redirected to one DB node.

One of our Galera cluster encounter one node down (wsrep_ready=OFF). We restarted the DB node but IST encountered the same error. We need to remove data directory and let Galera to trigger SST in order to resume the DB node.

DB version is 10.6.10 and Galera version is 26.4.12

We have another similar incident MDEV-30303

2023-01-06 22:04:55 2 [Note] WSREP: MDL BF-BF conflict

schema:  tswtrn1

request: (2     seqno 31040753  wsrep (high priority, exec, executing) cmd 0 161        select nextval(`SEQUENCE_LPCO_ID`)<87>*<B8>c^S^A)

granted: (6     seqno 31040752  wsrep (high priority, exec, preparing) cmd 0 161        (null))

2023-01-06 22:04:55 2 [ERROR] Aborting