[BUG] Crash: "Illegal instruction" (Bun panic) after extended use - memory leak (~20GB RSS)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude Code crashes with "Illegal instruction" error after less than 1 hour of use.

Symptoms:

• Applications freeze
• White screens appear
• Complete system hang requiring force quit

Frequency: 2 crashes today within hours of each other

Crash details from console:

• Error: panic(main thread): Illegal instruction at address 0x7FF60CC90CFB
• Memory at crash: 20.52GB RSS, 70GB virtual memory commit
• Page faults: 8,631,806
• Elapsed: ~13 minutes of runtime before crash

What Should Happen?

Claude Code should remain stable during normal use without:

• Unbounded memory growth
• System crashes
• Application freezes

Error Messages/Logs

"claude"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) abort_signal(46) fetch(180) jsc spawn(217) standalone_executable proc
ess_dlopen
Builtins: "bun:main" "node: assert" "node: async_hooks" "node: buffer" "node:child_process" "node:constants" "node:crypto"
"node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node: module" "node:net" "node:os" "node: path" "node
: path/posix" "node: path/win32" "node: perf_hooks" "node: process" "node: stream" "node: timers/promises" "node:tls" "node:tt
y" "node:url" "node:util" "node:zlib" "node: worker_threads" "undici" "ws" "node:http2"
Elapsed: 784286ms | User: 93843ms | Sys: 49906ms
RSS: 20.52GB | Peak: 21.39GB | Commit: 0.07TB | Faults: 8631806 | Machine: 34.28GB
panic(main thread): Illegal instruction at address 0x7FF60CC90CFB
oh no: Bun has crashed. This indicates a bug in Bun, not your code.
To send a redacted crash report to Bun's team,
please file a GitHub issue using the link below:
https://bun.report/1.3.9/e_26d2fefbmgEuhogC2vms2C0qyqtC67gnxCmq/mxCgj1mxCyr3j78215sCy1wniD_A3s//B2vmk5M

Steps to Reproduce

1. Start Claude Code on Windows 10.0.26100.7840
2. Work with code normally for less than 1 hour
3. Use various Claude Code features (editing, running commands, etc.)
4. After ~13 minutes runtime: system freezes, applications show white screens
5. Force quit required
6. Check console - shows "Illegal instruction" panic with 20GB+ memory usage

Note: Unable to identify specific triggering action - appears to happen during normal use.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.41 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Bundled Bun version: 1.3.9 (based on crash log)

System specs:

• Machine total RAM: 34.28GB
• Available at crash: minimal (most consumed by Claude Code)

Screenshot of crash log attached below:

!Image