roachtest: autoupgrade failed

[cockroach-teamcity]

(roachtest).autoupgrade failed on provisional_202006091546_v20.1.2@92670dd72acad03bd9de54a197d66ef423a90183:

		(1) /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod start --encrypt=false teamcity-2003306-1591809698-19-n5cpu4:4 returned
		  | stderr:
		  |
		  | stdout:
		  | teamcity-2003306-1591809698-19-n5cpu4: starting
		  | 0: ~ ./cockroach version: exit status 255
		  | (1) attached stack trace
		  |   | github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install.getCockroachVersion
		  |   | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install/cockroach.go:88
		  |   | github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install.Cockroach.Start.func2
		  |   | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install/cockroach.go:168
		  |   | github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install.(*SyncedCluster).Parallel.func1.1
		  |   | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/install/cluster_synced.go:1667
		  |   | runtime.goexit
		  |   | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		  | Wraps: (2) 3 safe details enclosed
		  | Wraps: (3) ~ ./cockroach version
		  | Wraps: (4) exit status 255
		  | Error types: (1) *withstack.withStack (2) *safedetails.withSafeDetails (3) *errutil.withMessage (4) *exec.ExitError: 
		  | I200610 17:48:21.315881 1 cluster_synced.go:1749  command failed
		Wraps: (2) exit status 1
		Error types: (1) *main.withCommandDetails (2) *exec.ExitError

	cluster.go:1512,context.go:135,cluster.go:1501,test_runner.go:825: dead node detection: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor teamcity-2003306-1591809698-19-n5cpu4 --oneshot --ignore-empty-nodes: exit status 1 1: 4916
		2: 4457
		3: 4676
		5: 4243
		4: dead
		Error: UNCLASSIFIED_PROBLEM: 4: dead
		(1) UNCLASSIFIED_PROBLEM
		Wraps: (2) attached stack trace
		  | main.glob..func13
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1115
		  | main.wrap.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:266
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).execute
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:766
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).ExecuteC
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:852
		  | github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).Execute
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:800
		  | main.main
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1789
		  | runtime.main
		  | 	/usr/local/go/src/runtime/proc.go:203
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (3) 3 safe details enclosed
		Wraps: (4) 4: dead
		Error types: (1) errors.Unclassified (2) *withstack.withStack (3) *safedetails.withSafeDetails (4) *errors.errorString

More

Artifacts: /autoupgrade

See this test on roachdash
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[irfansharif]

Dup #51776.

[irfansharif]

Actually, may not have been a dup, this has different symptoms. But we've lost the artifacts here so I'm not sure what there is to do.