Windows: Repeated codex.exe crashes with exception 0xC0000409 and generated crash dumps

What version of the Codex App are you using (From “About Codex” dialog)?

26.715.2305.0

What subscription do you have?

ChatGPT Pro

What platform is your computer?

Microsoft Windows 10.0.26200 x64

What issue are you seeing?

The Codex desktop application crashes repeatedly while working on coding tasks.

Observed facts:

• Windows Event Viewer reports codex.exe as the faulting application.
• Exception code: 0xC0000409.
• Windows automatically generated multiple crash dump (.dmp) files under:

%LOCALAPPDATA%\CrashDumps

• Feedback submitted from the app:

Feedback ID: 019f72a4-33ae-7c93-89b5-cc6f8e4903a4

Before opening this issue I investigated several possible causes:

• config.toml appears normal.
• Local API configuration appears normal.
• Git repositories work normally.
• Node.js and npm execute normally.
• Codex sandbox initializes successfully.

Based on these observations, I could not identify a project configuration issue. The available evidence shows that codex.exe is terminating with exception 0xC0000409, but I cannot determine the root cause without internal symbols.

I have multiple Windows crash dump (.dmp) files available if they would help the investigation.

What steps can reproduce the bug?

Feedback ID: 019f72a4-33ae-7c93-89b5-cc6f8e4903a4

What is the expected behavior?

The Codex desktop application should remain stable during normal coding sessions and should not terminate unexpectedly.

Additional information

Additional information:

• Windows generated multiple crash dumps for codex.exe.
• Windows Event Viewer consistently reports exception 0xC0000409.
• Internal feedback has already been submitted.

Feedback ID:
019f72a4-33ae-7c93-89b5-cc6f8e4903a4

If useful, I can provide the generated .dmp files for further analysis.