Native build crashes with 'integer does not fit in destination type' on Windows 11 AVX512

Resolved 💬 3 comments Opened Feb 7, 2026 by idansalutsky Closed Feb 11, 2026

Bug Description

The native Windows build (v2.1.34) consistently crashes with a Bun runtime panic during interactive sessions.

Error Message

panic(thread 32620): integer does not fit in destination type
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

System Information

  • OS: Windows 11 (MSYS_NT-10.0-26100)
  • Claude Code Version: 2.1.34 (native build)
  • Installation Path: C:\Users\USER\.local\bin\claude.exe
  • CPU Features: sse42 avx avx2 avx512

Memory Stats at Crash

  • RSS: 4.76GB
  • Peak: 6.64GB
  • Commit: 5.99GB
  • Machine Total: 16.95GB

Steps to Reproduce

  1. Install native build via claude install
  2. Run claude to start interactive session
  3. Use normally for a few minutes
  4. Crash occurs consistently

Workaround

Using npm version (npm install -g @anthropic-ai/claude-code) works without issues.

Additional Context

  • Crash happens after ~20-50 seconds of usage
  • Memory tuning env vars (BUN_GARBAGE_COLLECTOR_ITERATION_LEVEL, NODE_OPTIONS) did not help
  • The crash appears to be related to Bun's handling of large integers or memory allocation on AVX512 CPUs

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