roachtest: scrub/index-only/tpcc/w=100 failed

[cockroach-teamcity]

roachtest.scrub/index-only/tpcc/w=100 failed with artifacts on master @ 63679e7bf4a0244c6e46381751543cfe3f32388c:

		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc003a07fd8 sp=0xc003a07fd0 pc=0x4c5cc1
		  | created by golang.org/x/sync/errgroup.(*Group).Go
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 +0x66
		  |
		  | goroutine 3098 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc0033d7e60, 0xc000fe4c60)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc003a03fd0 sp=0xc003a03fc8 pc=0x12dd3e0
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc003a03fd8 sp=0xc003a03fd0 pc=0x4c5cc1
		  | created by golang.org/x/sync/errgroup.(*Group).Go
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 +0x66
		  |
		  | goroutine 3180 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc0033d7e60, 0xc0046f0060)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc003a04fd0 sp=0xc003a04fc8 pc=0x12dd3e0
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc003a04fd8 sp=0xc003a04fd0 pc=0x4c5cc1
		  | created by golang.org/x/sync/errgroup.(*Group).Go
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 +0x66
		  |
		  | goroutine 3177 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc0033d7e60, 0xc000cc9ec0)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc003a057d0 sp=0xc003a057c8 pc=0x12dd3e0
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc003a057d8 sp=0xc003a057d0 pc=0x4c5cc1
		  | created by golang.org/x/sync/errgroup.(*Group).Go
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 +0x66
		  |
		  | goroutine 3173 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc0033d7e60, 0xc000cc9c80)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc003a05fd0 sp=0xc003a05fc8 pc=0x12dd3e0
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc003a05fd8 sp=0xc003a05fd0 pc=0x4c5cc1
		  | created by golang.org/x/sync/errgroup.(*Group).Go
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 +0x66
		  | Error: SSH_PROBLEM: exit status 255
		  | (1) SSH_PROBLEM
		  | Wraps: (2) Node 5. Command with error:
		  |   | ``````
		  |   | ./cockroach workload run tpcc --warehouses=100 --histograms=perf/stats.json --wait=false --tolerate-errors --ramp=5m0s --duration=30m0s --prometheus-port=2112 --pprofport=33333  {pgurl:1-4}
		  |   | ``````
		  | Wraps: (3) exit status 255
		  | Error types: (1) errors.SSH (2) *hintdetail.withDetail (3) *exec.ExitError
		  |
		  | stdout:
		  | Initializing 1000 connections...
		  | Initializing 0 idle connections...
		  | Initializing 1000 workers and preparing statements...
		Wraps: (8) exit status 10
		Error types: (1) *withstack.withStack (2) *errutil.withPrefix (3) *withstack.withStack (4) *errutil.withPrefix (5) *withstack.withStack (6) *errutil.withPrefix (7) *cluster.WithCommandDetails (8) *exec.ExitError

Reproduce

See: roachtest README

/cc @cockroachdb/sql-queries

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