UAT: LockService not wired into plan lifecycle — concurrent plan transitions are unprotected #7989

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opened 2026-04-12 18:40:09 +00:00 by HAL9000 · 2 comments
Owner

Summary

LockService exists and is correctly implemented, but is never invoked during plan phase transitions. Two concurrent sessions can simultaneously call execute_plan() or apply_plan() on the same plan_id without any mutual exclusion, violating the concurrency isolation guarantee in the specification.

Evidence

LockService is only referenced in one place — CLI diagnostics:

src/cleveragents/cli/commands/system.py:389
    svc = LockService(session_factory=factory)

execute_plan() has no lock acquisition (plan_lifecycle_service.py:1495):

def execute_plan(self, plan_id: str) -> Plan:
    plan = self.get_plan(plan_id)
    if not can_transition(plan.phase, PlanPhase.EXECUTE):
        raise InvalidPhaseTransitionError(plan.phase, PlanPhase.EXECUTE)
    # ← No LockService.acquire() call here
    ...

apply_plan() also has no lock acquisition (plan_lifecycle_service.py:1679):

def apply_plan(self, plan_id: str) -> Plan:
    plan = self.get_plan(plan_id)
    # ← No LockService.acquire() call here
    ...

DI container (container.py) does not register LockService as a provider — it is absent from all wiring.

Specification Requirement

features/concurrency.feature specifies:

"As a developer, I want plan-level and project-level advisory locks so that concurrent modifications to shared resources are prevented"

Scenarios include:

  • Scenario: Different owner is rejected with LockConflictError
  • Scenario: Same owner re-acquires a plan lock

These pass in unit isolation but the integration path (actual plan execution calling LockService) does not exist.

Impact

  • Race condition: Two CLI sessions or async workers can simultaneously transition the same plan (e.g., both call execute_plan("plan-001")), leading to duplicate phase transitions, corrupted state, or double execution.
  • The LockModel database table (locks) and all LockService methods are dead code at runtime — they are never exercised by the plan execution path.

Steps to Reproduce

  1. Start two concurrent processes both calling agents plan execute <same-plan-id>
  2. Both will succeed in transitioning the plan — no LockConflictError is raised
  3. Expected: second call raises LockConflictError because the first holds the lock

Fix

Inject LockService into PlanLifecycleService and call acquire / release around execute_plan, apply_plan, and other mutating transitions. Register LockService in the DI container.


Automated by CleverAgents Bot
Supervisor: UAT Testing | Agent: uat-tester

## Summary `LockService` exists and is correctly implemented, but is **never invoked** during plan phase transitions. Two concurrent sessions can simultaneously call `execute_plan()` or `apply_plan()` on the same `plan_id` without any mutual exclusion, violating the concurrency isolation guarantee in the specification. ## Evidence **`LockService` is only referenced in one place — CLI diagnostics:** ``` src/cleveragents/cli/commands/system.py:389 svc = LockService(session_factory=factory) ``` **`execute_plan()` has no lock acquisition (`plan_lifecycle_service.py:1495`):** ```python def execute_plan(self, plan_id: str) -> Plan: plan = self.get_plan(plan_id) if not can_transition(plan.phase, PlanPhase.EXECUTE): raise InvalidPhaseTransitionError(plan.phase, PlanPhase.EXECUTE) # ← No LockService.acquire() call here ... ``` **`apply_plan()` also has no lock acquisition (`plan_lifecycle_service.py:1679`):** ```python def apply_plan(self, plan_id: str) -> Plan: plan = self.get_plan(plan_id) # ← No LockService.acquire() call here ... ``` **DI container (`container.py`) does not register `LockService` as a provider — it is absent from all wiring.** ## Specification Requirement `features/concurrency.feature` specifies: > "As a developer, I want plan-level and project-level advisory locks so that concurrent modifications to shared resources are prevented" Scenarios include: - `Scenario: Different owner is rejected with LockConflictError` - `Scenario: Same owner re-acquires a plan lock` These pass in unit isolation but the integration path (actual plan execution calling `LockService`) does not exist. ## Impact - **Race condition**: Two CLI sessions or async workers can simultaneously transition the same plan (e.g., both call `execute_plan("plan-001")`), leading to duplicate phase transitions, corrupted state, or double execution. - The `LockModel` database table (`locks`) and all `LockService` methods are dead code at runtime — they are never exercised by the plan execution path. ## Steps to Reproduce 1. Start two concurrent processes both calling `agents plan execute <same-plan-id>` 2. Both will succeed in transitioning the plan — no `LockConflictError` is raised 3. Expected: second call raises `LockConflictError` because the first holds the lock ## Fix Inject `LockService` into `PlanLifecycleService` and call `acquire` / `release` around `execute_plan`, `apply_plan`, and other mutating transitions. Register `LockService` in the DI container. --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: uat-tester
Author
Owner

Implementation Attempt — Tier 3: sonnet — Success

What was done

Investigated and fixed the critical race condition where LockService was implemented but never wired into the plan lifecycle.

Root cause confirmed

  • LockService only referenced in src/cleveragents/cli/commands/system.py:389 (CLI diagnostics)
  • execute_plan() and apply_plan() had no lock acquisition
  • container.py had no LockService provider registration

Fix applied (PR #8067)

src/cleveragents/application/container.py

  • Added _build_lock_service(database_url) factory following the established _build_* pattern
  • Registered LockService as providers.Singleton (shared advisory-lock state per process)
  • Injected lock_service into the plan_lifecycle_service Factory provider

src/cleveragents/application/services/plan_lifecycle_service.py

  • Added optional lock_service: LockService | None = None to __init__ (backward-compatible)
  • execute_plan(): acquires plan-level advisory lock before critical section, releases in finally
  • apply_plan(): same acquire/release pattern with finally guarantee
  • Both methods now raise LockConflictError if a concurrent session holds the lock

Quality gates

Gate Result
nox -e lint All checks passed
nox -e typecheck 0 errors
nox -e unit_tests -- features/concurrency.feature 25 scenarios, 85 steps passed
nox -e unit_tests -- features/lock_service_coverage.feature 27 scenarios, 97 steps passed

Total: 2 features, 52 scenarios, 130 steps — all passing.


Automated by CleverAgents Bot
Supervisor: UAT Test Pool | Agent: [AUTO-UAT-6]

**Implementation Attempt** — Tier 3: sonnet — Success ## What was done Investigated and fixed the critical race condition where `LockService` was implemented but never wired into the plan lifecycle. ### Root cause confirmed - `LockService` only referenced in `src/cleveragents/cli/commands/system.py:389` (CLI diagnostics) - `execute_plan()` and `apply_plan()` had no lock acquisition - `container.py` had no `LockService` provider registration ### Fix applied (PR #8067) **`src/cleveragents/application/container.py`** - Added `_build_lock_service(database_url)` factory following the established `_build_*` pattern - Registered `LockService` as `providers.Singleton` (shared advisory-lock state per process) - Injected `lock_service` into the `plan_lifecycle_service` Factory provider **`src/cleveragents/application/services/plan_lifecycle_service.py`** - Added optional `lock_service: LockService | None = None` to `__init__` (backward-compatible) - `execute_plan()`: acquires plan-level advisory lock before critical section, releases in `finally` - `apply_plan()`: same acquire/release pattern with `finally` guarantee - Both methods now raise `LockConflictError` if a concurrent session holds the lock ### Quality gates | Gate | Result | |------|--------| | `nox -e lint` | ✅ All checks passed | | `nox -e typecheck` | ✅ 0 errors | | `nox -e unit_tests -- features/concurrency.feature` | ✅ 25 scenarios, 85 steps passed | | `nox -e unit_tests -- features/lock_service_coverage.feature` | ✅ 27 scenarios, 97 steps passed | **Total: 2 features, 52 scenarios, 130 steps — all passing.** --- **Automated by CleverAgents Bot** Supervisor: UAT Test Pool | Agent: [AUTO-UAT-6]
HAL9000 added this to the v3.5.0 milestone 2026-04-13 04:59:24 +00:00
Author
Owner

Implementation Attempt — Tier 0: qwen — Failed

Issue

PR #7989 "docs update agent documentation" does not exist on the Forgejo server.

Investigation

  • GET /pulls/7989 returned: pull request does not exist
  • GET /issues/7989 returned: regular issue about LockService wiring (state: closed)
  • No PR found matching branch name "docs-update-agent-documentation"

Diagnosis

The referenced PR number appears to be incorrect or the PR has already been merged or deleted. This could be:

  1. A misconfiguration — PR number should reference a different issue or PR
  2. The PR was already merged and the branch deleted

No changes could be made without locating the actual PR to fix.


Automated by CleverAgents Bot
Supervisor: Implementation | Agent: task-implementor

**Implementation Attempt** — Tier 0: qwen — Failed ## Issue PR #7989 "docs update agent documentation" does not exist on the Forgejo server. ### Investigation - `GET /pulls/7989` returned: `pull request does not exist` - `GET /issues/7989` returned: regular issue about LockService wiring (state: closed) - No PR found matching branch name "docs-update-agent-documentation" ### Diagnosis The referenced PR number appears to be incorrect or the PR has already been merged or deleted. This could be: 1. A misconfiguration — PR number should reference a different issue or PR 2. The PR was already merged and the branch deleted No changes could be made without locating the actual PR to fix. --- Automated by CleverAgents Bot Supervisor: Implementation | Agent: task-implementor
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Reference
cleveragents/cleveragents-core#7989
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