Windows: Bundled Bun 1.3.5 crashes with segmentation fault

Resolved 💬 3 comments Opened Jan 31, 2026 by drowssaP Closed Feb 4, 2026

Description

Claude Code v2.1.27 on Windows crashes after extended sessions due to a segmentation fault in the bundled Bun 1.3.5.

Environment

  • Claude Code: v2.1.27
  • OS: Windows 11 (MINGW64_NT-10.0-26100)
  • Bundled Bun: 1.3.5
  • System Bun: 1.3.8 (works fine, but ignored by native installer)

Crash Details

Bun v1.3.5 (1e86cebd) Windows x64 (baseline)
Elapsed: 40995446ms | User: 249609ms | Sys: 78765ms
RSS: 0.60GB | Peak: 1.11GB | Commit: 1.07GB

panic(main thread): Segmentation fault at address 0xFFFFFFFFFFFFFFFF

Crash report: https://bun.report/1.3.5/e_11e86cebmgEuhogCkkkhkByx2gkBq22unB___A2DD

Reproduction

  • Run Claude Code on Windows for extended sessions (~11 hours in this case)
  • Crash occurs during normal operation

Attempted Fixes

  • Reinstalled Claude Code (npm version, then native installer)
  • Installed Bun 1.3.8 globally - native installer ignores it and uses bundled 1.3.5

Request

  1. Update bundled Bun to 1.3.8+ which fixes this segfault
  2. Or allow Claude Code to use system-installed Bun instead of bundled version

Workaround

Restarting Claude Code every few hours before memory accumulates.

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