Codex crashes when serializing image-heavy saved task payloads #36157

Summary

Codex desktop crashes when an older, image-heavy saved task is opened or read. The issue reproduces across two builds and appears to occur while Electron/V8 serializes the task payload for the renderer.

Reproduction

1. Use a saved task containing many image-generation and inline image outputs.
2. Reopen or request a read of that task.
3. The app crashes shortly afterward.

Observed behavior

• Four native crashes occurred across two builds.
• The crash signature is EXC_BREAKPOINT / SIGTRAP in the Chromium main process, with V8 ValueSerializer::HasCustomHostObject in the stack.
• Reading the affected BitChat research task reproduced the failure; smaller task reads succeeded.
• The affected task lineage contained roughly 700 MB of duplicated base64 image data.

Scope

• Direct access to the related workspace files worked normally.
• The workspace itself does not appear to be the cause; deserializing the oversized saved task payload appears to be the trigger.
• Fresh tasks are unaffected.

Expected behavior

Codex should open the saved task safely, or fail gracefully without crashing the desktop app.

Workaround

Avoid reopening or reading the affected oversized task; use fresh tasks and access workspace files directly.