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[Bug Hunt Cycle 2 Batch 3] CRITICAL: Race condition in tool execution state management #7076

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opened 2026-04-10 07:29:46 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-10 07:29:46 +00:00

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Bug Report: Concurrency — Race Condition in Tool Execution State

Severity Assessment

Impact: Concurrent tool executions may use inconsistent tool specifications, potentially causing incorrect behavior
Likelihood: Medium - occurs under concurrent load with multiple threads executing the same tool
Priority: Critical

Location

File: src/cleveragents/tool/runner.py
Function: ToolRunner.execute()
Lines: 270-273

Description

The tool execution logic has a race condition where tool activation state is checked under lock, but registry lookup happens outside the lock. This creates a window where tool state can change between the active check and registry lookup.

Evidence

# Lines 270-273:
with self._active_lock:
    spec = self._active.get(tool_name)  # Check active under lock
if spec is None:
    spec = self._registry.get(tool_name)  # Registry lookup OUTSIDE lock

Expected Behavior

Tool specification should be retrieved atomically to ensure consistent execution state.

Actual Behavior

Thread A checks active tools under lock, finds none
Thread B activates the same tool between A's lock release and registry lookup
Thread A gets registry version while Thread B gets active version
Different specifications may be used for the same tool execution

Reproduction Details

Set up multiple threads executing the same tool concurrently
One thread calls activate() while another calls execute()
Race condition window exists between lines 271 and 273
Affects scenarios: high-concurrency environments, parallel plan execution, load testing

Suggested Fix

Extend lock scope to include registry lookup:

with self._active_lock:
    spec = self._active.get(tool_name)
    if spec is None:
        spec = self._registry.get(tool_name)

TDD Note

After this bug issue is verified, a corresponding Type/Testing issue will be created for TDD. The test will use tags: @tdd_issue, @tdd_issue_, and @tdd_expected_fail to prove the bug exists before fixing it.

Automated by CleverAgents Bot
Supervisor: Bug Hunting | Agent: bug-hunter
Worker Type: Module Scanner

## Bug Report: Concurrency — Race Condition in Tool Execution State ### Severity Assessment - **Impact**: Concurrent tool executions may use inconsistent tool specifications, potentially causing incorrect behavior - **Likelihood**: Medium - occurs under concurrent load with multiple threads executing the same tool - **Priority**: Critical ### Location - **File**: `src/cleveragents/tool/runner.py` - **Function**: `ToolRunner.execute()` - **Lines**: 270-273 ### Description The tool execution logic has a race condition where tool activation state is checked under lock, but registry lookup happens outside the lock. This creates a window where tool state can change between the active check and registry lookup. ### Evidence ```python # Lines 270-273: with self._active_lock: spec = self._active.get(tool_name) # Check active under lock if spec is None: spec = self._registry.get(tool_name) # Registry lookup OUTSIDE lock ``` ### Expected Behavior Tool specification should be retrieved atomically to ensure consistent execution state. ### Actual Behavior - Thread A checks active tools under lock, finds none - Thread B activates the same tool between A's lock release and registry lookup - Thread A gets registry version while Thread B gets active version - Different specifications may be used for the same tool execution ### Reproduction Details 1. Set up multiple threads executing the same tool concurrently 2. One thread calls `activate()` while another calls `execute()` 3. Race condition window exists between lines 271 and 273 4. Affects scenarios: high-concurrency environments, parallel plan execution, load testing ### Suggested Fix Extend lock scope to include registry lookup: ```python with self._active_lock: spec = self._active.get(tool_name) if spec is None: spec = self._registry.get(tool_name) ``` ### Category concurrency ### TDD Note After this bug issue is verified, a corresponding Type/Testing issue will be created for TDD. The test will use tags: @tdd_issue, @tdd_issue_<this-issue-number>, and @tdd_expected_fail to prove the bug exists before fixing it. --- **Automated by CleverAgents Bot** Supervisor: Bug Hunting | Agent: bug-hunter **Worker Type**: Module Scanner

HAL9000 referenced this issue

2026-04-10 07:30:47 +00:00

[AUTO-BUG-POOL] Status: Bug Detection Report (Cycle 2) #7023

HAL9000 referenced this issue

2026-04-10 07:35:12 +00:00

BUG-HUNT: [CONCURRENCY] Race condition in CircuitBreaker shared state access #7088

HAL9000 added the

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label

2026-04-10 18:57:45 +00:00

freemo added the

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2026-04-12 18:37:30 +00:00

HAL9000 added

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2026-04-14 06:48:54 +00:00

HAL9000 commented

2026-04-14 06:48:55 +00:00

Author

Owner

✅ Verified — Critical concurrency bug: race condition in tool execution state management. MoSCoW: Must-have. Priority: Critical.

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

✅ **Verified** — Critical concurrency bug: race condition in tool execution state management. MoSCoW: Must-have. Priority: Critical. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor