roachtest: backupTPCC failed

[cockroach-teamcity]

roachtest.backupTPCC failed with artifacts on master @ 63679e7bf4a0244c6e46381751543cfe3f32388c:

		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000d04fd8 sp=0xc000d04fd0 pc=0x49d281
		  | 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 222 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc000c94d20, 0xc000cf5da0)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc000d057d0 sp=0xc000d057c8 pc=0x10eb400
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000d057d8 sp=0xc000d057d0 pc=0x49d281
		  | 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 223 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc000c94d20, 0xc000cf5e00)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc000d05fd0 sp=0xc000d05fc8 pc=0x10eb400
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000d05fd8 sp=0xc000d05fd0 pc=0x49d281
		  | 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 224 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc000c94d20, 0xc000cf5e60)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc000d067d0 sp=0xc000d067c8 pc=0x10eb400
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000d067d8 sp=0xc000d067d0 pc=0x49d281
		  | 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 225 [runnable]:
		  | golang.org/x/sync/errgroup.(*Group).Go.func1(0xc000c94d20, 0xc000cf5ec0)
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/golang.org/x/sync/errgroup/errgroup.go:54 fp=0xc000d06fd0 sp=0xc000d06fc8 pc=0x10eb400
		  | runtime.goexit()
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000d06fd8 sp=0xc000d06fd0 pc=0x49d281
		  | 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 1. Command with error:
		  |   | ``````
		  |   | ./workload run tpcc --warehouses=10 {pgurl:1-3}
		  |   | ``````
		  | Wraps: (3) exit status 255
		  | Error types: (1) errors.SSH (2) *hintdetail.withDetail (3) *exec.ExitError
		  |
		  | stdout:
		  | Initializing 20 connections...
		  | Initializing 0 idle connections...
		  | Initializing 100 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/bulk-io

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