### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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? 2026-02-10 08:35:36.937 [info] From claude: ============================================================ Bun Canary v1.3.9-canary.51 (d5628db2) Linux x64

[BUG]

Resolved 💬 4 comments Opened Feb 10, 2026 by vsisnet Closed Mar 11, 2026

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?

2026-02-10 08:35:36.937 [info] From claude: ============================================================
Bun Canary v1.3.9-canary.51 (d5628db2) Linux x64 (baseline)
Linux Kernel v6.8.0 | glibc v2.39
Args: "/root/.vscode-server/extensions/anthropic.claude-code-2.1.38-linux-x64/resources/native-binary/claude" "--output-format" "stream-json" "--verbose" "--input-format" "stream-json" "--max-thinking-tokens" "31999"
2026-02-10 08:35:36.937 [info] From claude: "--model" "de"...
Features: jsc no_avx2 no_avx standalone_executable
Builtins: "bun:main"
Elapsed: 62314ms | User: 47685ms | Sys: 14484ms
RSS: 14.37GB | Peak: 5.22GB | Commit: 14.37GB | Faults: 59 | Machine: 16.78GB

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x262F7800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2kmBhgggwI

2026-02-10 08:35:37.640 [info] From claude: curl: (22) The requested URL returned error: 502

2026-02-10 08:35:37.906 [info] Closing Claude on channel: mucx58zi7bd
2026-02-10 08:35:37.906 [error] Error from Claude (on channel mucx58zi7bd): Error: Claude Code process terminated by signal SIGILL
2026-02-10 08:36:16.090 [info] From claude: ============================================================
Bun Canary v1.3.9-canary.51 (d5628db2) Linux x64 (baseline)
Linux Kernel v6.8.0 | glibc v2.39
Args: "/root/.vscode-server/extensions/anthropic.claude-code-2.1.38-linux-x64/resources/native-binary/claude" "--output-format" "stream-json" "--verbose" "--input-format" "stream-json" "--max-thinking-tokens" "0" "
2026-02-10 08:36:16.091 [info] From claude: --model" "defaul"...
Features: jsc no_avx2 no_avx standalone_executable
Builtins: "bun:main"
Elapsed: 51373ms | User: 43915ms | Sys: 6958ms
RSS: 14.38GB | Peak: 5.22GB | Commit: 14.38GB | Faults: 212 | Machine: 16.78GB

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x3B919800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2y7BggggwZ

2026-02-10 08:36:16.278 [info] From claude: ============================================================
Bun Canary v1.3.9-canary.51 (d5628db2) Linux x64 (baseline)
Linux Kernel v6.8.0 | glibc v2.39
Args: "/root/.vscode-server/extensions/anthropic.claude-code-2.1.38-linux-x64/resources/native-binary/claude" "--output-format" "stream-json" "--verbose"
2026-02-10 08:36:16.278 [info] From claude: "--input-format" "stream-json" "--max-thinking-tokens" "31999" "--model" "de"...
Features: jsc no_avx2 no_avx standalone_executable
Builtins: "bun:main"
Elapsed: 51376ms | User: 44033ms | Sys: 6948ms
RSS: 14.38GB | Peak: 5.22GB | Commit: 14.38GB | Faults: 181 | Machine: 16.78GB

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x5BBB5800000

2026-02-10 08:36:16.279 [info] From claude: 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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA227ChgggwqC

2026-02-10 08:36:16.903 [info] From claude: curl: (22) The reque
2026-02-10 08:36:16.904 [info] From claude: sted URL returned error: 502

2026-02-10 08:36:17.206 [info] Closing Claude on channel: zda9d07oz4
2026-02-10 08:36:17.207 [error] Error from Claude (on channel zda9d07oz4): Error: Claude Code process terminated by signal SIGILL

What Should Happen?

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x262F7800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2kmBhgggwI

2026-02-10 08:35:37.640 [info] From claude: curl: (22) The requested URL returned error: 502

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x3B919800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2y7BggggwZ

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x5BBB5800000

2026-02-10 08:36:16.279 [info] From claude: 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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA227ChgggwqC

2026-02-10 08:36:16.903 [info] From claude: curl: (22) The reque
2026-02-10 08:36:16.904 [info] From claude: sted URL returned error: 502

2026-02-10 08:36:17.206 [info] Closing Claude on channel: zda9d07oz4
2026-02-10 08:36:17.207 [error] Error from Claude (on channel zda9d07oz4): Error: Claude Code process terminated by signal SIGILL

Error Messages/Logs

Steps to Reproduce

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x262F7800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2kmBhgggwI

2026-02-10 08:35:37.640 [info] From claude: curl: (22) The requested URL returned error: 502

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x3B919800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2y7BggggwZ

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x5BBB5800000

2026-02-10 08:36:16.279 [info] From claude: 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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA227ChgggwqC

2026-02-10 08:36:16.903 [info] From claude: curl: (22) The reque
2026-02-10 08:36:16.904 [info] From claude: sted URL returned error: 502

2026-02-10 08:36:17.206 [info] Closing Claude on channel: zda9d07oz4
2026-02-10 08:36:17.207 [error] Error from Claude (on channel zda9d07oz4): Error: Claude Code process terminated by signal SIGILL

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.34

Claude Code Version

2.1.38

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x262F7800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2kmBhgggwI

2026-02-10 08:35:37.640 [info] From claude: curl: (22) The requested URL returned error: 502

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x3B919800000
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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA2y7BggggwZ

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x5BBB5800000

2026-02-10 08:36:16.279 [info] From claude: 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/B_2d5628dbEggggigD4skkwE+ypRgpjt9Cstg4pDkgt2pD+2+k1Di1jhmE0os1sEwj6vtF_6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhE6muvhEA227ChgggwqC

2026-02-10 08:36:16.903 [info] From claude: curl: (22) The reque
2026-02-10 08:36:16.904 [info] From claude: sted URL returned error: 502

2026-02-10 08:36:17.206 [info] Closing Claude on channel: zda9d07oz4
2026-02-10 08:36:17.207 [error] Error from Claude (on channel zda9d07oz4): Error: Claude Code process terminated by signal SIGILL

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