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[Bug Hunt Cycle 2 Batch 3] HIGH: Resource leak in container output stream reading #7072

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opened 2026-04-10 07:29:16 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-10 07:29:16 +00:00

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Bug Report: Resource Leak — Inefficient Stream Draining in Bounded Reading

Severity Assessment

Impact: Memory and CPU waste when container tools produce large output, potential performance degradation under load
Likelihood: Medium - occurs when tools produce more than 50MB of output
Priority: High

Location

File: src/cleveragents/tool/container_executor.py
Function: _read_bounded()
Lines: 736-738

Description

When the output exceeds _MAX_OUTPUT_BYTES (50MB), the _read_bounded function continues reading and discarding chunks until EOF instead of breaking immediately. This wastes CPU cycles and memory bandwidth on data that will be discarded.

Evidence

# Lines 736-738:
remaining = max_bytes - total
if remaining <= 0:
    # Already at the cap — drain the stream without keeping data
    continue  # BUG: continues reading indefinitely until EOF

Expected Behavior

Once the maximum bytes are read, the function should stop reading or use a more efficient draining strategy.

Actual Behavior

Continues reading all remaining output even though it's discarded
Wastes CPU cycles on unnecessary reads
May consume significant time for tools that produce large output

Reproduction Details

Execute a container tool that produces >50MB of output (e.g., large log dump, file listing)
Monitor CPU usage during execution
Observe continued high I/O activity even after 50MB cap is reached
Affects scenarios: tools that generate large debugging output, file transfer operations, data exports

Suggested Fix

if remaining <= 0:
    # Stop reading once cap is reached
    break

Or implement a more efficient stream draining strategy that reads larger chunks for discard.

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: Resource Leak — Inefficient Stream Draining in Bounded Reading ### Severity Assessment - **Impact**: Memory and CPU waste when container tools produce large output, potential performance degradation under load - **Likelihood**: Medium - occurs when tools produce more than 50MB of output - **Priority**: High ### Location - **File**: `src/cleveragents/tool/container_executor.py` - **Function**: `_read_bounded()` - **Lines**: 736-738 ### Description When the output exceeds `_MAX_OUTPUT_BYTES` (50MB), the `_read_bounded` function continues reading and discarding chunks until EOF instead of breaking immediately. This wastes CPU cycles and memory bandwidth on data that will be discarded. ### Evidence ```python # Lines 736-738: remaining = max_bytes - total if remaining <= 0: # Already at the cap — drain the stream without keeping data continue # BUG: continues reading indefinitely until EOF ``` ### Expected Behavior Once the maximum bytes are read, the function should stop reading or use a more efficient draining strategy. ### Actual Behavior - Continues reading all remaining output even though it's discarded - Wastes CPU cycles on unnecessary reads - May consume significant time for tools that produce large output ### Reproduction Details 1. Execute a container tool that produces >50MB of output (e.g., large log dump, file listing) 2. Monitor CPU usage during execution 3. Observe continued high I/O activity even after 50MB cap is reached 4. Affects scenarios: tools that generate large debugging output, file transfer operations, data exports ### Suggested Fix ```python if remaining <= 0: # Stop reading once cap is reached break ``` Or implement a more efficient stream draining strategy that reads larger chunks for discard. ### Category resource ### 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 added the

State

Unverified

label

2026-04-10 18:57:46 +00:00

freemo added the

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2026-04-12 18:37:32 +00:00

HAL9000 added

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2026-04-14 06:52:47 +00:00

HAL9000 commented

2026-04-14 06:52:48 +00:00

Author

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✅ Verified — Critical resource bug: resource leak in container output stream reading. MoSCoW: Must-have. Priority: Critical.

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

✅ **Verified** — Critical resource bug: resource leak in container output stream reading. MoSCoW: Must-have. Priority: Critical. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor