Embedded bun (v1.3.x) causes segmentation faults with intel Apple MacOS.

[dderyldowney]

Description

Kilo Code CLI comes with bun embedded that is v1.3.8. Kilo Code CLI v0.25.1 is the last with the 1.2.x series bunembedded. This works perfectly fine. If I npm install -g @kilocode/cli, which installs v1.0.21 as of this post's timestamp. Immediate upon execution of kilo, it immediately dies with the following text:

kilo main [f6fb723]
============================================================
Bun v1.3.8 (b64edcb4) macOS x64
macOS v26.3
CPU: sse42 popcnt avx avx2
Args: "/usr/local/lib/node_modules/@kilocode/cli/node_modules/@kilocode/cli-darwin-x64/bin/kilo" "--user-agent=kilo/1.0.21" "--use-system-ca" "--"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) fetch(3) jsc spawn standalone_executable workers_spawned
Builtins: "bun:ffi" "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:console" "node:crypto" "node:dns" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:perf_hooks" "node:process" "node:querystring" "node:readline" "node:stream" "node:string_decoder" "node:timers" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "undici" "node:v8" "node:http2" "node:diagnostics_channel" "node:dgram"
Elapsed: 1239ms | User: 1066ms | Sys: 226ms
RSS: ^[]11;rgb:213d/2743/33e7^G0.31GB | Peak: 0.31GB | Commit: 0.17GB | Faults: 200 | Machine: 0.07TB

panic: Bus error at address 0x7000030C5FE0
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/ma1b64edcbmQugogC___A4gg4Bg+vxhD

Plugins

No response

Kilo version

1.0.x

Steps to reproduce

1. npm install -g @kilocode/cli on an Intel-based Apple machine (This is a 2019 Intel-based i-9 2.4Ghz Apple MacBook Pro with 64GB RAM)
2. Execute kilo in any project directory.
3. Watch it immediately segmentation fault, and blame the embedded bun.

Screenshot and/or share link

Operating System

macOS 0.26.3

Terminal

iTerm2 && Terminal.app

[dderyldowney]

The report given to bun from the output URL for bun's repo looks like this. This is all the information I get once I post to the URL.

[dderyldowney]

dderyldowney@Ds-MacBook-Pro:~/dev
> which bun                                                                                                    main [f6fb723]
bun: aliased to ~/.bun/bin/bun

dderyldowney@Ds-MacBook-Pro:~/dev
> ls -la ~/.bun/bin/bun                                                                                        main [f6fb723]
-rwxr-xr-x  1 dderyldowney  staff  65087672 Feb 12 02:37 /Users/dderyldowney/.bun/bin/bun

dderyldowney@Ds-MacBook-Pro:~/dev
> bun --version                                                                                                main [f6fb723]
1.3.10

dderyldowney@Ds-MacBook-Pro:~/dev
> echo $BUN_RUNTIME                                                                                            main [f6fb723]
~/.bun/bin/bun

dderyldowney@Ds-MacBook-Pro:~/dev
> echo $BUN_INSTALL                                                                                            main [f6fb723]
/Users/dderyldowney/.bun
                                                                                                                              

dderyldowney@Ds-MacBook-Pro:~/dev
>                                                                                                              main [f6fb723]

dderyldowney@Ds-MacBook-Pro:~/dev
> kilo                                                                                                         main [f6fb723]
============================================================
Bun v1.3.8 (b64edcb4) macOS x64
macOS v26.3
CPU: sse42 popcnt avx avx2
Args: "/usr/local/lib/node_modules/@kilocode/cli/node_modules/@kilocode/cli-darwin-x64/bin/kilo" "--user-agent=kilo/1.0.21" "--use-system-ca" "--"
Features: Bun.stderr(2) Bun.stdin(2) Bun.stdout(2) fetch(3) jsc spawn standalone_executable workers_spawned 
Builtins: "bun:ffi" "bun:main" "node:assert" "node:async_hooks" "node:buffer" "node:child_process" "node:console" "node:crypto" "node:dns" "node:events" "node:fs" "node:fs/promises" "node:http" "node:https" "node:module" "node:net" "node:os" "node:path" "node:perf_hooks" "node:process" "node:querystring" "node:readline" "node:stream" "node:string_decoder" "node:timers" "node:timers/promises" "node:tls" "node:tty" "node:url" "node:util" "undici" "node:v8" "node:http2" "node:diagnostics_channel" "node:dgram" 
Elapsed: 1253ms | User: 1096ms | Sys: 145ms
RSS: 0.31GB | Peak: 0.31GB | Commit: 0.16GB | Faults: 200 | Machine: 0.07TB

panic: Bus error at address 0x70000B824FE0
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/ma1b64edcbmQugogC___A4gg4Bg+npwL

^[]11;rgb:213d/2743/33e7^G%                                                                                                   
dderyldowney@Ds-MacBook-Pro:~/dev
> 11;rgb:213d/2743/33e7                                                                                        main [f6fb723]

dderyldowney@Ds-MacBook-Pro:~/dev
>                                                                                                              main [f6fb723]

It also totally ignores a locally installed version of bun even with $BUN_RUNTIME set., since Kilo Code Cli is not respecting the env var, I can not test to see if the newest version of bun fixes the issue which supposedly was fixed in 1.3.9 and current version of bun is 1.3.10.

[dderyldowney]

dderyldowney@Ds-MacBook-Pro:~/dev
> npm install -g @kilocode/cli@0.25.1                                                                          main [f6fb723]
npm warn deprecated node-domexception@1.0.0: Use your platform's native DOMException instead

changed 946 packages in 18s

161 packages are looking for funding
  run `npm fund` for details

dderyldowney@Ds-MacBook-Pro:~/dev
>                                                                                                              main [f6fb723]
> kilo

[dderyldowney]

I can confirm that kilocode/cli v0.26.1 works. That, if I'm not mistaken, was the last version with v1.2.x, specifically using bun v1.2.3.