Illegal instruction crash on ARM64 Linux in Apple Virtualization Framework (AVF) — embedded Bun runtime incompatible

Environment

• OS: Debian Linux, kernel 6.1.0-34-avf-arm64 (Apple Virtualization Framework VM)
• Architecture: aarch64 (ARM64)
• CPU part: 0xd81 (ARM Neoverse V2)
• CPU features: SVE2, BTI, I8MM, BF16, FEAT_LRCPC, FEAT_PAC, and many more
• glibc: 2.36
• Node.js: v20.20.2

Problem

All Claude Code versions from 2.1.140 onward crash with Illegal instruction (exit code 132) on this system. These versions ship a native ARM64 binary that embeds Bun as its JavaScript runtime.

$ claude --version
============================================================
Bun v1.3.14 (d2989145) Linux arm64
Illegal instruction

Bun versions tested that crash: 1.3.14 (embedded in 2.1.140) and 1.4.0 (embedded in 2.1.181+).

Notably, Bun 1.3.14 installed via the official bun.sh installer works fine on the same system — suggesting the embedded Bun binary uses different compile flags (e.g., targeting ARM instructions not exposed by the AVF hypervisor).

Reproduction

npm install -g @anthropic-ai/claude-code   # installs latest (2.1.215+)
claude --version  # → Illegal instruction (exit 132)

Also reproduced with the official install script:

curl -fsSL https://claude.ai/install.sh | bash  # → Illegal instruction (exit 132)

Workaround

Install the last Node.js-based version:

npm install -g @anthropic-ai/claude-code@2.1.112

This works because older versions use Node.js as the runtime instead of a bundled Bun binary.

Request

Please either:

1. Investigate which ARM instruction the embedded Bun uses that the official bun.sh build avoids, or
2. Fall back to Node.js on systems where the native binary fails to execute.