roachtest: ssh_problem failed

roachtest.ssh_problem [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21472974?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21472974?buildTab=artifacts#/admission-control/disk-bandwidth-limiter) on release-25.2.23-rc @ [de96348c2c12bcba9ab3d5675da33cc4e5ed0750](https://github.com/cockroachdb/cockroach/commits/de96348c2c12bcba9ab3d5675da33cc4e5ed0750):

```
test admission-control/disk-bandwidth-limiter failed: (cluster.go:2451).Run: full command output in run_064858.911104130_n2_cockroach-workload-r.log: error persisted after 3 attempts: _potential_ SSH flake (``ssh -vvv`` log retained in /artifacts/admission-control/disk-bandwidth-limiter/cpu_arch=arm64/run_1/ssh/ssh_064858.912719680_n2_cockroach-workload-r.log): TRANSIENT_ERROR(ssh_problem): exit status 255
(cluster.go:2451).Run: context canceled
(admission_control_disk_bandwidth_overload.go:148).func1: failed to set kvadmission.store.provisioned_bandwidth: context canceled
test artifacts and logs in: /artifacts/admission-control/disk-bandwidth-limiter/cpu_arch=arm64/run_1
```

Parameters:
- MetamorphicFilesystem=xfs
- MetamorphicVolumeType=local-ssd
- arch=arm64
- cloud=aws
- coverageBuild=false
- cpu=8
- diskCount=0
- encrypted=false
- fs=xfs
- localSSD=true
- metamorphicLeases=default
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

_Grafana is not yet available for aws clusters_

Same failure on other branches

- #172557 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.14-rc]
- #172517 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.22-rc]
- #172515 roachtest: ssh_problem failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.8-rc]

/cc @cockroachlabs/test-eng

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*ssh_problem.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Start with the SSH failure log under /artifacts/admission-control/disk-bandwidth-limiter/cpu_arch=arm64/run_1/ssh/ and the full command output in run_064858.911104130_n2_cockroach-workload-r.log. Read pkg/cmd/roachtest/cluster.go around line 2451 and admission_control_disk_bandwidth_overload.go around line 148, then compare the related failures in #172557, #172517, and #172515; done means the cause is identified and the recurring ssh_problem is addressed or correctly classified.

Written by the indexing model from the issue text.