Comment 2 for bug 1737731

Also reproduced on PXC 5.7.19-17-57-log:

2017-12-12T12:39:47.150706Z 5 [Note] WSREP: New cluster view: global state: ea51527b-df36-11e7-a529-3e7b80537600:92030, view# 8: Primary, number of nodes: 2, my index: 1, protocol version 3
2017-12-12T12:39:47.150714Z 5 [Note] WSREP: Setting wsrep_ready to true
2017-12-12T12:39:47.159516Z 5 [Note] WSREP: REPL Protocols: 7 (3, 2)
2017-12-12T12:39:47.159996Z 5 [Note] WSREP: Assign initial position for certification: 92030, protocol version: 3
2017-12-12T12:39:47.161030Z 0 [Note] WSREP: Service thread queue flushed.
2017-12-12T12:39:47.161814Z 5 [ERROR] WSREP: Certification failed for TO isolated action: source: 1b19a14d-d689-11e7-8bab-9ebe5b9af4cc version: 3 local: 0 state: CERTIFYING flags: 65 conn_id: 416 trx_id: -1 seqnos (l: 93906, g: 92031, s: 92020, d: -1, ts: 1151558439465456)
2017-12-12T12:39:47.161848Z 5 [Note] WSREP: Closing send monitor...
2017-12-12T12:39:47.161854Z 5 [Note] WSREP: Closed send monitor.
2017-12-12T12:39:47.161861Z 5 [Note] WSREP: gcomm: terminating thread
2017-12-12T12:39:47.161870Z 5 [Note] WSREP: gcomm: joining thread
2017-12-12T12:39:47.162019Z 5 [Note] WSREP: gcomm: closing backend