Segfault when running numpy in sandbox

What version of Codex is running?

0.56.0

What subscription do you have?

Enterprise

Which model were you using?

_No response_

What platform is your computer?

Darwin 24.6.0 arm64 arm

What issue are you seeing?

Segfault when importing numpy in the sandbox:

❯ codex debug seatbelt python -c 'import numpy'
❯ echo $?
139

or

OpenAI Codex v0.56.0 (research preview)
--------
workdir: /tmp
model: gpt-5-codex
provider: openai
approval: never
sandbox: workspace-write [workdir, /tmp, $TMPDIR]
reasoning effort: none
reasoning summaries: auto
session id: 019a67ee-bbc5-77a1-bd31-23f22da627b7
--------
user
run python -c "import numpy"

thinking
**Preparing to run shell command**
exec
bash -lc 'python -c "import numpy"' in /tmp exited -1 in 0ms:
execution error: Sandbox(Signal(11))

thinking
**Reporting command failure due to segfault**
codex
Tried `python -c "import numpy"` and it crashed with signal 11 inside the sandbox (likely a segfault in the local Python/Numpy build). Let me know if you want to gather more diagnostics or try a different environment.
tokens used
554
Tried `python -c "import numpy"` and it crashed with signal 11 inside the sandbox (likely a segfault in the local Python/Numpy build). Let me know if you want to gather more diagnostics or try a different environment.

What steps can reproduce the bug?

uv init foobar
cd foobar
uv add "numpy<2"
uv run codex debug seatbelt python -c 'import numpy'

What is the expected behavior?

_No response_

Additional information

_No response_