ruvnet
claude-flow hive-mind spawn frequently crashing with "Database connection closed, cannot remove child PID during cleanup"
Running latest claude-flow@alpha 2.7
The process craps out sometimes, crashing Claude Code too.
I had Hive Mind analyze the issue and it came up with:
:tada: HIVE MIND MISSION COMPLETE :crown: Queen's Final Report The Hive Mind collective intelligence system has successfully completed the investigation and resolution of the critical database connection crash. :bar_chart: Mission Summary Objective: Debug and analyze "Database connection closed, cannot remove child PID during cleanup" Status: :white_check_mark: COMPLETE with 100% worker consensus Swarm Configuration:
- Workers: 4 (Researcher, Coder, Analyst, Tester)
- Consensus: 100% unanimous agreement
- Coordination: Strategic Queen :dart: Key Findings The Problem Race condition in the claude-flow Node.js orchestration layer (not the Java codebase). Database connection closes 2-15ms before child PID cleanup operations complete, causing:
- Process crashes during shutdown
- 3 orphaned sessions with dead parent PIDs
- WAL file bloat (781KB)
- Stale PID entries never removed The Solution Two-phase shutdown protocol:
- Phase 1 (Cleanup): Drain PIDs, save checkpoint, pause session
- Phase 2 (Teardown): Close database LAST :package: Deliverables Created Code Fixes (Production-Ready):
- session-manager-fix.js - Reference counting
- auto-save-middleware-fix.js - Cleanup sequencing
- hive-mind-coordinator-fix.js - Shutdown orchestration Test Suite:
- DatabaseConnectionCleanupTest.java - 25 tests, 96+ assertions, 100% coverage Documentation (1,900+ lines):
- HIVE_MIND_CONSENSUS_REPORT.md - Complete analysis
- EXECUTIVE_SUMMARY.md - Quick reference
- DATABASE_CONNECTION_CLEANUP_ANALYSIS.md - Root cause details
- CONNECTION_CLEANUP_TEST_GUIDE.md - Testing guide
- IMPLEMENTATION_GUIDE.md - Step-by-step instructions
- collective-memory.json - Learnings for future resilience
EXECUTIVE_SUMMARY.md HIVE_MIND_CONSENSUS_REPORT.md HIVE_MIND_FIX_SUMMARY.md HIVE_MIND_RACE_CONDITION_ANALYSIS.md
I had this same issue after upgrading Claude Flow. Upgrading Claude Code fixed it.
npm install -g @anthropic-ai/claude-code
