roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21409183?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21409183?buildTab=artifacts#/kv95/enc=false/nodes=3/batch=16) on release-25.4 @ [63425122b3ebb6401edbbb426b417270fa4933c0](https://github.com/cockroachdb/cockroach/commits/63425122b3ebb6401edbbb426b417270fa4933c0):

```
test kv95/enc=false/nodes=3/batch=16 failed: (test_runner.go:891).func4: in provider: aws: aws create failed due to capacity for machine type m6id.2xlarge in zone(s) [us-east-2c]; suggested zone(s): [us-east-2a us-east-2b]: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type m6id.2xlarge --image-id ami-08692707dfc6f8b64 --key-name teamcity-runner-Pj0YIiVaLY7LQEZiEyjAfE1Sf-c= --region us-east-2 --security-group-ids sg-04d72b57e29d671f1 --subnet-id subnet-0e71591c1fe06645e --tag-specifications ResourceType=instance,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-25-4},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=fips},{Key=created,Value=2026-07-02T07:13:53Z},{Key=Name,Value=teamcity-21409183-1782973208-38-n4cpu8-0002},{Key=Cluster,Value=teamcity-21409183-1782973208-38-n4cpu8},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21409183-1782973208-38-n4cpu8}] ResourceType=volume,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-25-4},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=fips},{Key=created,Value=2026-07-02T07:13:53Z},{Key=Name,Value=teamcity-21409183-1782973208-38-n4cpu8-0002},{Key=Cluster,Value=teamcity-21409183-1782973208-38-n4cpu8},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21409183-1782973208-38-n4cpu8}] --user-data file:///tmp/aws-startup-script1950041547 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping1809557309 --instance-market-options MarketType=spot,SpotOptions={SpotInstanceType=one-time,InstanceInterruptionBehavior=terminate} --output json: stderr:
An error occurred (InsufficientInstanceCapacity) when calling the RunInstances operation (reached max retries: 2): We currently do not have sufficient m6id.2xlarge capacity in the Availability Zone you requested (us-east-2c). Our system will be working on provisioning additional capacity. You can currently get m6id.2xlarge capacity by not specifying an Availability Zone in your request or choosing us-east-2a, us-east-2b.: exit status 254 [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=8
- runtimeAssertionsBuild=false
- ssd=0
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)

Same failure on other branches

- #172020 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2]
- #171624 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.6-rc]
- #171623 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.12-rc]
- #171620 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.20-rc]
- #171526 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.1.30-rc]
- #171104 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1]

/cc @cockroachlabs/test-eng

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

Jira issue: CRDB-65358

Start with the linked TeamCity failure artifacts and the roachtest README, then trace cluster creation for AWS in the roachtest code. Compare this failure with the related cross-branch issues listed in the report. The issue does not state a desired change or acceptance condition, so the definition of done is not established.

Written by the indexing model from the issue text.