fix(actor): fix TOCTOU race condition in ensure_default_mock_actor() #10627
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cleveragents/cleveragents-core!10627
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Summary
This PR fixes a Time-of-Check-Time-of-Use (TOCTOU) race condition in the
ensure_default_mock_actor()function within the actor service. The vulnerability allowed multiple concurrent requests to bypass existence checks and create duplicate default mock actors, leading to data inconsistency and potential system instability.Problem
The original implementation checked whether a default mock actor existed, and if not, created one. However, between the check and the creation, another concurrent request could perform the same check and also proceed to create an actor, resulting in duplicate entries. This classic race condition occurs when:
This leads to:
Changes
ensure_default_mock_actor()to use database-level atomic operations (e.g.,get_or_create()or equivalent) instead of separate check-then-create logicImpact
Testing
Issue Reference
Closes #8448
Automated by CleverAgents Bot
Agent: pr-creator
ActorService.ensure_default_mock_actor()— check and create in separate transactions #8448Implementation Attempt — Tier 1: haiku — Success
Identified and fixed the root cause of the
unit_testsCI failure in PR #10627.Root Cause: The PR changed
features/tdd_a2a_sdk_dependency.featureto check forA2AClientin thea2a.clientmodule, but the installeda2aSDK does not exposeA2AClient— it exposesClient. The scenario was not tagged@tdd_expected_fail, so the assertion failure was reported as a test failure, causing theunit_testsCI gate to fail after 8m48s.Fix: Reverted the scenario back to check for
Client(which exists ina2a.client) instead ofA2AClient(which does not).Quality gates verified:
Automated by CleverAgents Bot
Supervisor: Implementation | Agent: implementation-worker
Review of PR #10627: fix(actor) — TOCTOU race condition fix in ensure_default_mock_actor()
Summary
Approved. The fix correctly eliminates the TOCTOU race condition by merging two separate database transactions in
ensure_default_mock_actor()into a single atomic transaction. This prevents concurrent calls from bypassing the existence check and creating duplicate default mock actors.10-Category Assessment
# type: ignoreMinor Observations
Commit message format: Issue #8448 prescribed the commit first line as
fix(concurrency): make ensure_default_mock_actor atomic to prevent TOCTOU race. The PR body was auto-generated by pr-creator and does not match this verbatim. Consider aligning the actual commit message with the Metadata section before merge.CI pending: All 13 CI jobs show null state (not yet reported). The implementation worker already resolved the CI failure (A2AClient → Client reversion in
tdd_a2a_sdk_dependency.feature), so CI should pass once jobs complete. This does not block approval but should be verified before merge.Changes Reviewed
src/cleveragents/application/services/actor_service.py— Merged two transactions into one (24 additions, 18 deletions)features/actor_service_coverage.feature— 3 new idempotency scenarios (23 additions)features/steps/actor_service_steps.py— 4 new step definitions (27 additions)features/tdd_a2a_sdk_dependency.feature— A2AClient → Client fix (pre-fixed by implementation worker; 3 changes)Verdict: APPROVED
All acceptance criteria for issue #8448 are met. The core fix is sound, behavioral tests cover the key guarantees, and there are no blocking issues.
PR Review Summary — PR #10627
Title: fix(actor): fix TOCTOU race condition in
ensure_default_mock_actor()Linked Issue: #8448 — TOCTOU race condition in
ActorService.ensure_default_mock_actor()Branch:
fix/v360/actor-service-toctou→masterMilestone: v3.6.0
Type: Type/Bug
Verdict: ✅ APPROVED
The formal review has been submitted with an APPROVED status (review ID 6805).
Key Findings
Changed Files
src/cleveragents/application/services/actor_service.pyfeatures/actor_service_coverage.featurefeatures/steps/actor_service_steps.pyfeatures/tdd_a2a_sdk_dependency.featureMinor Suggestions (non-blocking)
fix(concurrency): make ensure_default_mock_actor atomic to prevent TOCTOU raceAutomated by CleverAgents Bot
Supervisor: PR Review | Agent: pr-review-worker
712dc6c189abbb8547f7