[BUG] Multi-window crash: raw data floods terminals, all agent sessions dead simultaneously (v2.1.90, Windows)

Summary

With 10+ Claude Code windows running simultaneously on Windows, all windows crashed at once. Multiple terminals were flooded with massive amounts of raw comma-separated numbers — not application output, appears to be buffer contents or Bun crash dump data being written to stdout uncontrollably.

Screenshot

User preserved a screenshot showing the full desktop: 10+ Claude Code terminal windows, multiple showing raw number dumps flooding the terminal output area. All agent sessions were dead simultaneously.

What was running

• RAM Audit Agent
• Agent B Exit Forensics
• Agent C Live Features
• Agent D V3 Retrain
• Agent A Entry Forensics
• Agent F 1-Min Pipeline
• git manager
• Bug Manager
• IQ Feed connectivity monitor
• Multiple PowerShell windows

All running active work — pipeline builds, file reads, model training.

Impact

Total system failure. All agent sessions dead simultaneously. The bug-reporter agent was also dead, so the user could not even file a report during the incident. All overnight pipeline work lost. Had to restart everything from scratch.

Environment

• v2.1.90, Windows 11
• Windows Terminal / PowerShell
• 10+ simultaneous Claude Code windows
• Active pipeline work (file I/O, Python builds, model training)
• Max plan, Opus 4.6

Likely root cause

Bun runtime memory exhaustion or GC crash under multi-process load. Each Claude Code window is an independent node/Bun process. 10+ windows x ~800MB each = 8+ GB just for Claude Code, on top of active Python pipeline processes consuming 12+ GB.

Related issues

• #1421 — JS Heap OOM from multiple windows
• #36132 — Bun mimalloc leaks ~1GB/hour, crashes after 12-24h
• #21469 — Random Bun segfaults on Windows
• #41831 — Tool calls stall 10-20 min + Bun GC crash
• #42535 — Many MCP servers break subagents (Explore tools)

The raw number dump to stdout is distinctive — this is not a normal crash or hang. Something in the Bun runtime or terminal rendering layer is dumping raw buffer contents when it fails.