Bun segfault crash (0xFFFFFFFFFFFFFFFF) on Windows during normal usage

Bug Description

Claude Code crashes with a Bun segmentation fault during normal usage on Windows.

Environment

• Claude Code: v2.1.44
• Model: Opus 4.6 (Claude Max)
• Bun: Canary v1.3.9-canary.62 (6d2fefba) Windows x64 (baseline)
• OS: Windows 10 (win10_ni)
• CPU: sse42 avx avx2
• Machine RAM: 68.53GB

Error Output

panic(main thread): Segmentation fault at address 0xFFFFFFFFFFFFFFFF
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

Memory Stats at Crash

• RSS: 0.80GB | Peak: 0.86GB | Commit: 1.19GB
• Faults: 322751
• Elapsed: 71107ms (~71 seconds into the session)

Steps to Reproduce

1. Launch Claude Code on Windows (claude command)
2. Start a normal conversation session
3. Crash occurs ~71 seconds into the session with segfault

Bun Crash Report Link

The crash generated a Bun report link:

https://bun.report/1.3.9/e_26d2fefbmgkgEuhogDgm+2W88outB4s+mqCU9uiqC6ssiqCy7sqXozg0U23wN2/tgUm17jOimsjOw0vxvDCYKERNEL32.DLLo35FCSntdll.dllipmTA2DD

Additional Context

• This happened at session startup, approximately 71 seconds after launch
• The working directory was a git repository (E:\Lyricist)
• Permission mode was set to "don't ask on"