Fix Copilot SDK crashes in Cloud Hypervisor by Copilot · Pull Request #55495 · github/gh-aw

Copilot · 2026-08-24T19:30:06Z

Copilot SDK workflows under Cloud Hypervisor could exit with code 1 because filesystem isolation blocked creation of session-state logs under /tmp/gh-aw/sandbox/agent/logs.

Sandbox policy
- Allow the canonical agent-log directory for Cloud Hypervisor Copilot runs.
- Keep the permission Copilot-specific to avoid broadening other engines’ writable paths.
Coverage
- Verify Copilot receives the required log permission.
- Verify other engines retain their existing narrower policy.

Fixes [aw-failures] [aw] Failure Investigator Report — 2026-08-24 19:02 UTC (6h) #55489

gh-aw-pr-sous-chef: attempted branch refresh in run https://github.com/github/gh-aw/actions/runs/32780228606

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Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

github-actions · 2026-08-24T20:59:10Z

✅ Ponytail Reviewer completed successfully!

Generated by Ponytail Reviewer for #55495

github-actions · 2026-08-24T20:59:21Z

🧠 Matt Pocock Skills Reviewer has completed the skills-based review. ✅

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github-actions · 2026-08-24T20:59:26Z

✅ Design Decision Gate 🏗️ completed the design decision gate check.

No ADR enforcement needed: PR #55495 does not have the 'implementation' label and has only 22 new lines of code in business logic directories (threshold: 100).

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github-actions · 2026-08-24T20:59:34Z

✅ PR Code Quality Reviewer completed the code quality review.

Completed PR review. No actionable changed-line issues were found, so no review comments or submit-review write was needed from safeoutputs.

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github-actions · 2026-08-24T20:59:47Z

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github-actions

A small simplification opportunity is worth considering here. net: -2 lines possible.

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github-actions · 2026-08-24T21:03:29Z

 // Seeding a default there would therefore break every compose-runtime workflow, so
 // filesystem.allowWrite stays opt-in for those runtimes.
-func ensureDefaultAgentWritePath(sandboxConfig *SandboxConfig) {
+func ensureDefaultAgentWritePath(sandboxConfig *SandboxConfig, engineConfig *EngineConfig) {


pkg/workflow/sandbox.go:312: yagni: the new engineConfig plumbing for a one-off copilot branch. Keep the helper engine-agnostic and add the log-path tweak inline at the call site until a second engine needs it.

github-actions · 2026-08-24T21:04:13Z

Comment Memory

reviewed_at: 2026-08-24T00:00:00Z
review_event: COMMENT
top_themes:
  - no actionable changed-line issues found
files_reviewed:
  - pkg/workflow/cloud_hypervisor_test.go
  - pkg/workflow/sandbox.go
  - pkg/workflow/sandbox_test.go
comment_count: 0

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github-actions

The fix is clean and well-targeted. ensureDefaultAgentWritePath now correctly seeds /tmp/gh-aw/sandbox/agent/logs for the Copilot engine under Cloud Hypervisor. The nil guard on engineConfig is present, and the updated tests cover the new expected path. No blocking issues found.

🧵 Reviewed using Impeccable skills by Impeccable Skills Reviewer · copilot · sonnet46 · 17.6 AIC · ⌖ 8.96 AIC · ⊞ 6.2K

github-actions

Skills-Based Review 🧠

Applied /diagnosing-bugs and /tdd — requesting changes on two focused issues.

📋 Key Themes & Highlights

Issues Found

Magic string: "copilot" used directly in sandbox.go instead of constants.CopilotEngine — inconsistent with the rest of the codebase
Missing regression test: No TestApplySandboxDefaults case for Cloud Hypervisor + non-copilot engine, leaving the guard unverified by the unit suite

Positive Highlights

✅ Targeted fix: log-path permission is Copilot-specific, preserving other engines' narrower policy
✅ Good inline documentation explaining the Cloud Hypervisor virtiofs export model
✅ cloud_hypervisor_test.go updated to assert the full allowWrite order including the new path
✅ Clean, minimal change — only touches what's needed

🧠 Reviewed using Matt Pocock's skills by Matt Pocock Skills Reviewer · copilot · sonnet46 · 41.5 AIC · ⌖ 9.93 AIC · ⊞ 7.6K
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Comments that could not be inline-anchored

pkg/workflow/sandbox.go:326

[/diagnosing-bugs] Magic string "copilot" should use constants.CopilotEngine to stay consistent with the rest of the codebase and avoid silent drift.

<details>
<summary>💡 Suggested fix</summary>

import &quot;github.com/github/gh-aw/pkg/constants&quot;

// in ensureDefaultAgentWritePath:
if engineConfig != nil &amp;&amp; engineConfig.ID == string(constants.CopilotEngine) {
    addAllowWritePathIfMissing(sandboxConfig.Agent.Config.Filesystem, defaultAgentLogsWritePath)
}

Every other engine-ID…

pkg/workflow/sandbox_test.go:263

[/tdd] Missing test case: Cloud Hypervisor + non-copilot engine (e.g. claude) should confirm that defaultAgentLogsWritePath is not added. The PR description says "Verify other engines retain their existing narrower policy", but TestApplySandboxDefaults has no Cloud Hypervisor case for a non-copilot engine — only a compose-runtime claude case (no Runtime set).

<details>
<summary>💡 Suggested test case</summary>

{
    name: &quot;cloud-hypervisor runtime for non-copilot engin…

</details>

Copilot

Pull request overview

Adds Copilot-specific write access for Cloud Hypervisor session-state logs, preventing SDK crashes while preserving other engines’ narrower policies.

Changes:

Adds the canonical agent-log directory to Copilot’s Cloud Hypervisor allowlist.
Updates sandbox and generated AWF configuration tests.
Confirms non-Copilot engines retain existing permissions.

Show a summary per file

File	Description
`pkg/workflow/sandbox.go`	Adds Copilot-specific log-directory permission.
`pkg/workflow/sandbox_test.go`	Verifies engine-specific allowlists.
`pkg/workflow/cloud_hypervisor_test.go`	Verifies generated AWF configuration.

Review details

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Files reviewed: 3/3 changed files
Comments generated: 0
Review effort level: Balanced

gh-aw-bot · 2026-08-24T21:44:58Z

gh-aw-pr-sous-chef
@copilot PR Sous Chef triage: this PR still needs forward progress before maintainer investigation is likely to be productive.

Please do one focused follow-up pass:

review the current blocking feedback and either push the smallest required fix or reply in-thread if no code change is needed
refresh the branch if needed and use the pr-finisher skill before handing back for review
run make fmt if you touch code

I also attempted a branch refresh for this PR in this run.

Run: https://github.com/github/gh-aw/actions/runs/32780228606

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Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

This reverts commit 54d5b7b. Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

Copilot · 2026-08-24T21:56:32Z

gh-aw-pr-sous-chef
@copilot PR Sous Chef triage: this PR still needs forward progress before maintainer investigation is likely to be productive.
...

Follow-up complete in 6271d65: use constants.CopilotEngine and explicitly verify Cloud Hypervisor non-Copilot engines do not receive the log-path permission. Also reverted unrelated lockfile drift from the branch refresh.

done

github-actions · 2026-08-25T05:08:57Z

🎉 This pull request is included in a new release.

Release: v0.87.5

Initial plan

6802d09

Copilot AI assigned Copilot and pelikhan Aug 24, 2026

Copilot started work on behalf of pelikhan August 24, 2026 19:30 View session

Copilot AI linked an issue Aug 24, 2026 that may be closed by this pull request

[aw-failures] [aw] Failure Investigator Report — 2026-08-24 19:02 UTC (6h) #55489

Closed

Fix Copilot logs in Cloud Hypervisor

ddf2f76

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix GitHub Copilot CLI native-engine crash~~ Fix Copilot SDK crashes in Cloud Hypervisor Aug 24, 2026

Copilot finished work on behalf of pelikhan August 24, 2026 19:55

Copilot AI requested a review from pelikhan August 24, 2026 19:55

pelikhan marked this pull request as ready for review August 24, 2026 20:57

Copilot AI balanced review requested due to automatic review settings August 24, 2026 20:57

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[aw] No-Op Runs #48838

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[pr-sous-chef] PR Sous Chef run report #55197

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Merge branch 'main' into copilot/fix-native-engine-crash

ec2fed2

Copilot started work on behalf of gh-aw-bot August 24, 2026 21:45 View session

Copilot AI and others added 3 commits August 24, 2026 21:49

Review Cloud Hypervisor follow-up

54d5b7b

Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

Revert "Review Cloud Hypervisor follow-up"

1aff2b4

This reverts commit 54d5b7b. Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

Address Cloud Hypervisor sandbox review

6271d65

Co-authored-by: gh-aw-bot <259018956+gh-aw-bot@users.noreply.github.com>

Copilot finished work on behalf of gh-aw-bot August 24, 2026 21:56

Copilot AI requested a review from gh-aw-bot August 24, 2026 21:56

pelikhan merged commit 4524d12 into main Aug 24, 2026
34 checks passed

pelikhan deleted the copilot/fix-native-engine-crash branch August 24, 2026 22:18

This was referenced Aug 25, 2026

Smoke Test: MAI-Code-1-Flash - 32804908647 #55598

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Smoke Test: MAI-Code-1-Flash - 32807470495 #55618

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