The test failed on branch=provisional_202007271721_v20.1.4, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/schemachange/mixed-versions/run_1
	cluster.go:2055,versionupgrade.go:315,versionupgrade.go:167,mixed_version_schemachange.go:144,mixed_version_schemachange.go:36,test_runner.go:754: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod start --binary=./cockroach --encrypt=false teamcity-2122385-1595896218-02-n4cpu4:1 returned: exit status 1
		(1) /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod start --binary=./cockroach --encrypt=false teamcity-2122385-1595896218-02-n4cpu4:1 returned
		  | stderr:
		  |
		  | stdout:
		  | teamcity-2122385-1595896218-02-n4cpu4: starting nodes
		  | teamcity-2122385-1595896218-02-n4cpu4: initializing clusterI200728 00:37:12.546694 21 cockroach.go:163  unable to initialize cluster: ~ 
		  | 		if ! test -e /mnt/data1/cockroach/cluster-bootstrapped ; then
		  | 			COCKROACH_CONNECT_TIMEOUT=0 ././cockroach init --url 'postgres://root@localhost:26257?sslmode=disable' && touch /mnt/data1/cockroach/cluster-bootstrapped
		  | 		fi
		  | warning: --url specifies user/password, but command "init" does not accept user/password details - details ignored
		  | *
		  | * ERROR: ERROR: rpc error: code = Unknown desc = cluster has already been initialized
		  | * HINT: Please ensure all your start commands are using --join.
		  | *
		  | E200728 00:37:12.522796 1 cli/error.go:373  ERROR: rpc error: code = Unknown desc = cluster has already been initialized
		  | HINT: Please ensure all your start commands are using --join.
		  | ERROR: rpc error: code = Unknown desc = cluster has already been initialized
		  | HINT: Please ensure all your start commands are using --join.
		  | Failed running "init": exit status 1
		Wraps: (2) exit status 1
		Error types: (1) *main.withCommandDetails (2) *exec.ExitError