flake: TestProvision/external-agent

[flake-investigator]

CI Run: https://github.com/coder/coder/actions/runs/21963166795
Commit: b1f48f8d472c1636ca051b835b695c89070eed26 (author: ケイラ)

Failing job: test-go-pg-17 (Linux)
Failure time: 2026-02-12T20:35:41Z (same window as Slack alert)

Test failure:

• Package: provisioner/terraform
• Test: TestProvision/external-agent

Log evidence:

=== FAIL: provisioner/terraform TestProvision/external-agent (21.24s)
    t.go:111: ... executor: command done  args="[init -no-color -input=false -json]"  error="exit status 1"
    t.go:111: ... init failed  error="exit status 1"
    t.go:111: ... recv done on Session ... error= drpc: stream terminated by sending error
    provision_test.go:1125:
        Error: Received unexpected error:
            cannot plan before successful init

Notes:

• No data race warnings or panic/OOM indicators in this job section.
• The failing subtest sets SkipCacheProviders: true in provisioner/terraform/provision_test.go, so Terraform init may hit the network for providers; stderr from terraform init was not present in the logs.

Root cause classification: Infrastructure/flaky (terraform init failed; likely transient provider download/registry/network issue, but logs do not include explicit provider error).

Duplicate search summary (coder/internal):

• "TestProvision/external-agent"
• "external-agent" provisioner terraform
• "cannot plan before successful init"
• "drpc" "stream terminated"

Related issues:

• flake: [Infrastructure] Terraform provider install 503 - provisioner/terraform TestProvision/ai-task-app-id #1193 (provider install 503 in TestProvision/ai-task-app-id; similar init failure class)

Assignment analysis:

• Test definition: provisioner/terraform/provision_test.go (external-agent subtest around lines ~981-1020).
• Recent non-trivial test file changes from git log --oneline -10 --follow provisioner/terraform/provision_test.go show caching-related updates by Kacper Sawicki (f543a87b) and provisioner changes by Steven Masley (61d7d298, 3194bcf). Assigning to Steven Masley (Emyrk) as provisioner/terraform owner; reassign if needed.

Reproduction (if needed):

• go test ./provisioner/terraform -run TestProvision/external-agent -count=1