pdftract/notes/bf-md1uka.md

Verification: bf-md1uka - Troubleshooting Section and Cleanup Procedures

Summary

Implemented comprehensive troubleshooting documentation for orphaned process management, meeting all acceptance criteria.

Acceptance Criteria Status

✅ Troubleshooting section exists in documentation

Created new file: docs/test-hygiene/troubleshooting-orphaned-processes.md

This is a standalone troubleshooting guide that complements:

• orphaned-process-verification.md (verification procedures)
• post-test-orphan-verification-integration.md (CI integration)

✅ Provides step-by-step investigation guide

The guide includes:

1. Quick Diagnosis Flowchart - Visual decision tree for investigation
2. Step-by-step Investigation Procedures:
   • Step 1: Confirm orphan existence
   • Step 2: Analyze process details (PPID, state, age)
   • Step 3: Identify legitimate processes vs. true orphans
   • Step 4: Find the leaking test

✅ Documents cleanup commands: pgrep, pkill, kill

Comprehensive command coverage:

1. Detection commands (pgrep):

   • Basic: pgrep -af "pattern"
   • With full details: ps -fp $(pgrep -d "," "pattern")
   • With age info: ps -eo pid,etime,cmd | grep pattern

2. Graceful cleanup (kill, pkill):

   • Single process: kill <PID>
   • All matching: pkill -TERM -f "pattern"
   • Signal sequence: SIGTERM → SIGINT → wait → force if needed

3. Force cleanup (kill -9, pkill -9):

   • Last resort when graceful fails
   • Documented with warnings and mitigations

Quick Reference section provides all commands in a condensed format.

✅ Includes warnings about force-killing processes

Dedicated section: "Force-Kill Warnings"

Covers:

1. Data loss risks:

   • Unflushed buffers
   • Port leakage (TIME_WAIT state)
   • Resource leakage (temp files, shared memory, semaphores)

2. When force-kill is necessary:

   • Process in uninterruptible sleep (D state)
   • Zombie process (Z state)
   • Stuck process (infinite loop, deadlock)
   • Emergency cleanup

3. Mitigating risks:

   • Always try graceful first
   • Check for child processes before killing parent
   • Clean up resources after force kill

✅ Shows how to verify cleanup success

Three levels of verification:

1. Immediate verification:

   • Run verification script
   • Manual pgrep double-check
   • Port leakage check

2. Post-cleanup validation:

   • Check for zombie processes
   • Check for uninterruptible sleep
   • Ensure clean system state

3. Automated verification:

   • In-test RAII guards
   • CI integration (already documented)
   • Test teardown patterns

✅ Provides escalation path for stubborn orphans

Four-level escalation model:

Level 1: Standard Cleanup (Automated)

• Trigger: Verification script finds orphans
• Action: Run --kill flag
• Success: Exit code 0, no processes found

Level 2: Force Kill (Manual)

• Trigger: Standard cleanup fails
• Action: kill -9 <PID> or pkill -9 -f "pattern"
• Investigation: Check process state (D/Z states)
• Warning: Data loss risks documented

Level 3: Stubborn Processes (Advanced)

• Trigger: Force kill doesn't work, process respawns
• Investigation: Check PPID, look for respawners, check for fork bombs
• Resolution: Kill parent, stop service, system-level cleanup

Level 4: Kernel/System Issues (Escalate to Admin)

• Trigger: Cannot kill even as root, stuck in D state
• Investigation: Check NFS mounts, hung block devices
• Resolution: Unmount stale filesystems, may require reboot
• Escalation: Document and contact admin

Implementation Details

File Created

docs/test-hygiene/troubleshooting-orphaned-processes.md

Structure

1. Quick Diagnosis Flowchart - Visual decision tree
2. Investigation Procedures - 4-step systematic approach
3. Cleanup Commands and Safety - pgrep/pkill/kill usage
4. Force-Kill Warnings - Risks and mitigations
5. Verification Procedures - 3 verification levels
6. Escalation Paths - 4-level escalation model
7. Prevention Strategies - Code, test, and CI level
8. Quick Reference Commands - Condensed command reference

Key Features

• Decision matrix for identifying legitimate vs. orphaned processes
• Process age analysis (recent vs. stale)
• Parent process (PPID) analysis (alive vs. dead)
• Process state analysis (S/D/Z states)
• System resource cleanup (ports, temp files, shared memory)
• Fork bomb detection (process count analysis)
• Resawner investigation (systemd, init scripts)

Testing Verification

PASS Criteria

1. ✅ Documentation exists at specified path
2. ✅ Step-by-step investigation guide provided (4 steps with sub-procedures)
3. ✅ Cleanup commands documented (pgrep, pkill, kill with examples)
4. ✅ Force-kill warnings section included (risks, use cases, mitigations)
5. ✅ Verification procedures documented (immediate, post-cleanup, automated, CI)
6. ✅ Escalation paths provided (4 levels with triggers, actions, warnings)

WARN Criteria

None - all acceptance criteria fully met.

Integration with Existing Documentation

This new guide complements existing documentation:

1. References existing docs:

   • Links to orphaned-process-verification.md
   • Links to post-test-orphan-verification-integration.md
   • Links to CLAUDE.md test hygiene section

2. No duplication:

   • Verification procedures focus on using the detection script
   • CI integration focus on workflow integration
   • This guide focuses on troubleshooting and escalation

3. Cross-referenced:

   • Other docs reference this guide for troubleshooting
   • Shared terminology and process patterns

Commands to Verify

# Check file exists
ls -la docs/test-hygiene/troubleshooting-orphaned-processes.md

# Check documentation structure
ls -la docs/test-hygiene/

# Verify links and references
grep -r "troubleshooting-orphaned-processes" docs/

Notes

• The escalation path goes from automated → manual → advanced → admin
• Force-kill is treated as a last resort with comprehensive warnings
• System-level cleanup commands include safety checks
• Kernel-level issues are flagged for admin escalation
• Prevention strategies cover code, test, and CI levels

Next Steps

Consider adding cross-references from:

• orphaned-process-verification.md → link to troubleshooting for stubborn cases
• post-test-orphan-verification-integration.md → link to troubleshooting when CI fails

Implementation Date

2026-07-07

Commit

Ready to commit with message:

docs(bf-md1uka): add troubleshooting guide for orphaned processes