[#MDEV-21655] galera.galera_wan_restart_ist MTR fails sporadically: WSREP did not transition to state READY

galera.galera_wan_restart_ist MTR fails sporadically on CI, 10.4/10.3/10.2 ES.
stdio.log:

10.4.12-6 90c709bf592e624ca1ee63e0ea8adad05e53d5d8
2020-02-04T06:02:25.3587995Z galera.galera_wan_restart_ist 'innodb' w2 [ fail ]
2020-02-04T06:02:25.3590196Z Test ended at 2020-02-04 06:02:25
2020-02-04T06:02:25.3590791Z
2020-02-04T06:02:25.3591183Z WSREP did not transition to state READY
2020-02-04T06:02:25.3591469Z
2020-02-04T06:02:25.3707824Z - saving '/var/tmp/mtr/2/log/galera.galera_wan_restart_ist-innodb/' to '/var/tmp/mtr/log/galera.galera_wan_restart_ist-innodb/'
2020-02-04T06:02:25.4115885Z ***Warnings generated in error logs during shutdown after running tests: galera.galera_wan_restart_ist
2020-02-04T06:02:25.4117222Z
2020-02-04T06:02:25.4118561Z 2020-02-04 5:58:24 0 [ERROR] WSREP: IST didn't contain all write sets, expected last: 3 last received: -1
2020-02-04T06:02:25.4119390Z 2020-02-04 5:58:24 1 [ERROR] WSREP: Receiving IST failed, node restart required: IST receiver reported failure: 71 (Protocol error)
2020-02-04T06:02:25.4120567Z 2020-02-04 5:58:24 1 [Warning] WSREP: Sending JOIN failed: -103 (Software caused connection abort). Will retry in new primary component.
2020-02-04T06:02:25.4121251Z 2020-02-04 5:58:24 1 [ERROR] WSREP: Failed to JOIN the cluster after SST

[MDEV-21655] galera.galera_wan_restart_ist MTR fails sporadically: WSREP did not transition to state READY Created: 2020-02-04 Updated: 2020-10-06 Resolved: 2020-09-17
Status:	Closed
Project:	MariaDB Server
Component/s:	Galera, Tests
Affects Version/s:	10.5.2, 10.2, 10.3, 10.4
Fix Version/s:	10.2.35, 10.3.26, 10.4.16, 10.5.7, 10.6.0