kiro-cli v2.0.0 crashes with SIGILL (Illegal Instruction) on QEMU Virtual CPU

[okajun35]

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

Linux 5.15.0-173-generic - Ubuntu 22.04.5 LTS

Expected behaviour

kiro-cli v2.0.0 should start the chat interface normally, as v1.27.0 does on the same machine.

Actual behaviour

kiro-cli v2.0.0 (both standard and musl builds) crashes immediately with SIGILL (Illegal Instruction) on a QEMU Virtual CPU lacking AVX support. The process exits with code 1 and no output.

Environment:

• OS: Ubuntu 22.04 (Linux 5.15.0-173-generic)
• CPU: QEMU Virtual CPU version 2.5+ (sse, sse2, ssse3, sse4_1, sse4_2 — no AVX/AVX2)
• glibc: 2.35
• kiro-cli: 2.0.0

strace output:
[pid 143019] --- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPN, si_addr=0x4226e88} ---
[pid 143019] +++ killed by SIGILL (core dumped) +++

The crash occurs after connecting to client-telemetry.us-east-1 via proxy. A child process is killed by SIGILL, causing the application to exit.

Workaround: downgrade to v1.27.0 and disable auto-updates with:
kiro-cli settings "app.disableAutoupdates" "true"

Steps to reproduce

1. Prepare a Linux VM with QEMU Virtual CPU (no AVX support)
2. Install kiro-cli v2.0.0 (standard or musl build)
3. Run "kiro-cli chat"
4. The process exits immediately with no output and exit code 1

Environment

<This will be visible to anyone. Do not include personal or sensitive information>

[q-details]
version = "1.27.0"
hash = "b9a4c4fd6bc4a3a624e0b2e03722a388fe28a8fe"
date = "2026-02-27T21:18:34.179205Z (46d ago)"
variant = "minimal"

[system-info]
chip = "QEMU Virtual CPU version 2.5+"
total-cores = 4
memory = "15.61 GB"

[system-info.os.linux]
kernel_version = "5.15.0-173-generic"
id = "ubuntu"
name = "Ubuntu"
pretty_name = "Ubuntu 22.04.5 LTS"
version_id = "22.04"
version = "22.04.5 LTS (Jammy Jellyfish)"

[environment]
cwd = "/home/USER"
cli-path = "/home/USER"
os = "Linux"
shell-path = "/usr/bin/bash"
shell-version = "5.1.16"
install-method = "unknown"
in-ssh = true

[env-vars]
PATH = "/home/USER/.local/bin:/home/USER/.local/bin:/home/USER/.nvm/versions/node/v24.14.1/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/USER/.local/bin"
Q_SET_PARENT_CHECK = "1"
SHELL = "/bin/bash"
TERM = "xterm"
XDG_SESSION_TYPE = "tty"