The test failed on branch=provisional_202005041945_v19.1.9, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/schemachange/mixed-versions/run_1
	cluster.go:2012,mixed_version_schemachange.go:57,versionupgrade.go:162,mixed_version_schemachange.go:118,mixed_version_schemachange.go:32,test_runner.go:753: output in run_214017.435_n3_workload_run_schemachange: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod run teamcity-1920090-1588628153-03-n4cpu4:3 -- ./workload run schemachange --concurrency 2 --max-ops 100 --verbose=1 {pgurl:1-4} returned: exit status 30
		(1) attached stack trace
		  | main.(*cluster).RunE
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2087
		  | main.(*cluster).Run
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2010
		  | main.runSchemaChangeWorkloadStep.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/mixed_version_schemachange.go:57
		  | main.(*versionUpgradeTest).run
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/versionupgrade.go:162
		  | main.runSchemaChangeMixedVersions
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/mixed_version_schemachange.go:118
		  | main.registerSchemaChangeMixedVersions.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/mixed_version_schemachange.go:32
		  | main.(*testRunner).runTest.func2
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/test_runner.go:753
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (2) 2 safe details enclosed
		Wraps: (3) output in run_214017.435_n3_workload_run_schemachange
		Wraps: (4) /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod run teamcity-1920090-1588628153-03-n4cpu4:3 -- ./workload run schemachange --concurrency 2 --max-ops 100 --verbose=1 {pgurl:1-4} returned
		  | stderr:
		  | Error: ERROR: syntax error at or near "sequences" (SQLSTATE 42601)
		  | Error: DEAD_ROACH_PROBLEM: exit status 1
		  | (1) DEAD_ROACH_PROBLEM
		  | Wraps: (2) Node 3. Command with error:
		  |   | ```
		  |   | ./workload run schemachange --concurrency 2 --max-ops 100 --verbose=1 {pgurl:1-4}
		  |   | ```
		  | Wraps: (3) exit status 1
		  | Error types: (1) errors.Cockroach (2) *hintdetail.withDetail (3) *exec.ExitError
		  |
		  | stdout:
		Wraps: (5) exit status 30
		Error types: (1) *withstack.withStack (2) *safedetails.withSafeDetails (3) *errutil.withMessage (4) *main.withCommandDetails (5) *exec.ExitError