Rebalance in failure after online upgrade using swap rebalance with high ops

./testrunner -i /tmp/upgrade.ini -p get-cbcollect-info=True,upgrade_version=5.5.0-2958,loader=high_doc_ops -t newupgradetests.MultiNodesUpgradeTests.online_upgrade_swap_rebalance_with_pillowfight,initial_version=4.6.0-3573,items=3000000,nodes_init=3,run_with_views=False

Rebalance exited with reason {mover_crashed,

{unexpected_exit,

{'EXIT',<0.31286.7>,

{{badmatch,{error,closed}},

{gen_server,call,

[{'janitor_agent-default',

'ns_1@172.23.107.205'},

{if_rebalance,<0.8754.7>,

{wait_dcp_data_move,

['ns_1@172.23.107.201',

'ns_1@172.23.107.207'],

337}},

infinity]}}}}}

Service 'memcached' exited with status 137. Restarting. Messages:

2018-07-11T23:29:55.995003Z WARNING (default) Slow runtime for 'Running a flusher loop: shard 2' on thread writer_worker_3: 1212 ms

2018-07-11T23:29:56.320928Z WARNING (default) DCP (Consumer) eq_dcpq:replication:ns_1@172.23.107.206->ns_1@172.23.107.205:default - (vb 504) End stream received but no such stream for this vBucket

2018-07-11T23:29:57.121430Z WARNING (default) Slow runtime for 'Removing (dead) vb:340 from memory and disk' on thread auxIO_worker_0: 206 ms

2018-07-11T23:29:57.396319Z WARNING (default) Slow runtime for 'Running a flusher loop: shard 2' on thread writer_worker_1: 1388 ms

2018-07-11T23:29:57.593589Z WARNING (default) Slow runtime for 'Running a flusher loop: shard 3' on thread writer_worker_3: 1017 ms

2018-07-11T23:29:57.598123Z WARNING (default) Slow runtime for 'Running a flusher loop: shard 1' on thread writer_worker_2: 1494 ms

2018-07-11T23:29:58.056985Z WARNING (default) Slow runtime for 'Paging out items.' on thread nonIO_worker_2: 47 ms

2018-07-11T23:29:58.693953Z WARNING (default) Slow runtime for 'Backfilling items for a DCP Connection' on thread auxIO_worker_0: 551 ms