2021-06-13  9:10:52 0 [Note] WSREP: Member 1.0 (mydb8) requested state transfer from 'XXX.XXX.XXX.XXX,'. Selected 3.0 (mydb9)(SYNCED) as donor.
2021-06-13  9:10:52 0 [Note] WSREP: 3.0 (mydb9): State transfer to 1.0 (mydb8) complete.
2021-06-13  9:10:52 0 [Note] WSREP: Member 3.0 (mydb9) synced with group.
2021-06-13  9:10:54 0 [Note] WSREP: (bc6b5ce8, 'tcp://0.0.0.0:4567') turning message relay requesting off
2021-06-13  9:10:54 0 [Note] WSREP: 1.0 (mydb8): State transfer from 3.0 (mydb9) complete.
2021-06-13  9:10:54 0 [Note] WSREP: Member 1.0 (mydb8) synced with group.
2021-06-13 14:16:41 0 [ERROR] WSREP: invalid state ROLLED_BACK (FATAL)
	 at galera/src/replicator_smm.cpp:abort_trx():727
2021-06-13 14:16:41 0 [ERROR] WSREP: cancel commit bad exit: 7 578781947
210613 14:16:41 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.