OpenCode 1.1.59 crashes immediately on chat (Bun AVX crash)

[ZimaBlueee]

Description

Description

After upgrading to OpenCode 1.1.59, the application crashes immediately as soon as I start a conversation.

It was working normally before the upgrade. Now, whenever I send a message, OpenCode crashes instantly.

My CPU supports AVX and AVX2 (Xeon W-2123, Skylake architecture), but Bun reports "CPU lacks AVX support".

I installed Bun separately on the same machine:

bun --version
1.3.9

The standalone Bun installation works correctly and does NOT crash.

This suggests that the issue is specific to the Bun binary bundled with OpenCode 1.1.59, rather than my CPU or Windows environment.

---

Environment

OS:

• Windows 10 Enterprise LTSC 1809
• OS Build: 17763.2989
• Installed: 2021/05/06

Node version:
v24.13.0

OpenCode version:
1.1.59 (installed via Scoop)

---

Crash Output

Bun v1.3.8 (b64edcb4) Windows x64

CPU lacks AVX support. Please consider upgrading to a newer CPU.

panic(thread 12254): Segmentation fault at address 0xA
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/1.3.8/](https://bun.report/1.3.8/)...

Plugins

oh-my-opencode

OpenCode version

1.1.59 (installed via Scoop)

Steps to reproduce

No response

Screenshot and/or share link

Operating System

Windows 10 Enterprise LTSC 1809

Terminal

wezterm

[github-actions]

---

This issue might be a duplicate of existing issues. Please check:

• [Bug] Windows binary selection picks AVX version on non-AVX CPUs #8744: [Bug] Windows binary selection picks AVX version on non-AVX CPUs
• Windows: opencode-cli crashes with illegal instruction (0xC000001D) on AMD FX-8350 starting in v1.1.52 #12642: Windows: opencode-cli crashes with illegal instruction on AMD FX-8350 starting in v1.1.52
• SIGILL (Illegal Instruction) on Intel Xeon E3-1270 V2 (no AVX-512/AVX2 support) #12512: SIGILL (Illegal Instruction) on Intel Xeon E3-1270 V2 (no AVX-512/AVX2 support)
• Windows: Installer should detect CPU capabilities and use baseline binary for CPUs without AVX2 #12553: Windows: Installer should detect CPU capabilities and use baseline binary for CPUs without AVX2

These issues all stem from the same root cause: OpenCode binaries are compiled with AVX/AVX2 instructions that aren't supported on older CPUs, causing immediate crashes. Your environment (Windows 10 LTSC with an older CPU architecture) is affected by the same bug.

[mm98]

I have a similar challenge. Bun.exe uses all memory and my PC freeze completely. I sometime get "Out of memory" exception in OpenCode desktop. I tried to take a screenshot, but it is completely impossible - since my PC locks up completely.

[ZimaBlueee]

Thanks — but this seems different.

My issue is an immediate AVX crash, not high memory usage or system freeze.
Standalone Bun works fine for me, so the problem appears specific to OpenCode’s bundled runtime.

[ZimaBlueee]

Root Cause Identified

I was able to reproduce the crash consistently.

The issue is triggered when a custom tool imports bun inside a tool file.

This version crashes immediately:

import { tool } from "@opencode-ai/plugin"
import path from "path"
import { $ } from "bun"

export default tool({
    description: "xxx",
    args: {
        table_name: tool.schema.string().describe("xxx"),
        category_name: tool.schema.string().optional().describe("xxx"),
    },
    async execute(args, context) {
        const { table_name, category_name } = args
        const script = path.join(context.directory, "tools/create-business-entity.js")
        
        const result = await $`node ${script} ${table_name} ${category_name ?? "xxx"}`.text()

        return result
    },
})

As soon as this tool exists in the tools directory, OpenCode 1.1.59 crashes on startup or when starting a conversation.

---

Conclusion

The crash appears to be triggered specifically by:

import { $ } from "bun"

inside a custom tool.

Standalone Bun (v1.3.9) works fine on my system, so this seems related to how Bun is bundled or exposed within OpenCode 1.1.59.

This is not a CPU limitation issue.

[luaNewer]

I met same problem as you today，same OS version，same Node version and same OpenCode version！

My temp solution：

1. set autoupdate to false in opencode.json；
2. use baseline 1.1.59 opencodex.exe instead，replace it in none baseline folder.

Btw，1.1.60 has the same problem，even include 1.1.60 baseline exe version！
Waiting someone fix this...

[trollkarlen]

It was introduced in version 1.1.52, version 1.1.51 works without SIGILL for non AVX machines.

for a in $(seq 53 -1 50); do echo "installing"; yarn global add opencode-ai@1.1.$a; echo "testing"; timeout 5 opencode >/dev/null; RET=$?; if [[ $RET == 124 ]]; then echo "exit code $RET in version $a, it works ?"; break; else echo "failed $RET"; fi; done

It also hides the exit code for SIGILL from the user and just exits without any output with exit code 0.

So a double fault 🥇

[rekram1-node]

How many of you are running opencode raw and hit this issue?

Like without custom plugins or tools