The test failed on branch=master, cloud=gce:
test artifacts and logs in: artifacts/acceptance/version-upgrade/run_1
	versionupgrade.go:261,versionupgrade.go:344,versionupgrade.go:190,versionupgrade.go:178,acceptance.go:58,acceptance.go:95,test_runner.go:754: EOF

	cluster.go:1651,context.go:135,cluster.go:1640,test_runner.go:823: dead node detection: /go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor local --oneshot --ignore-empty-nodes: exit status 1 2: dead
		3: 24019
		1: 24027
		4: 24017
		Error: UNCLASSIFIED_PROBLEM: 2: dead
		(1) UNCLASSIFIED_PROBLEM
		Wraps: (2) attached stack trace
		  -- stack trace:
		  | main.glob..func14
		  | 	/go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1143
		  | main.wrap.func1
		  | 	/go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:267
		  | github.com/spf13/cobra.(*Command).execute
		  | 	/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:830
		  | github.com/spf13/cobra.(*Command).ExecuteC
		  | 	/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914
		  | github.com/spf13/cobra.(*Command).Execute
		  | 	/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864
		  | main.main
		  | 	/go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1839
		  | runtime.main
		  | 	/usr/local/go/src/runtime/proc.go:203
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (3) 2: dead
		Error types: (1) errors.Unclassified (2) *withstack.withStack (3) *errutil.leafError