Windows desktop browser process crashes while generating a very large Git review diff

Summary

Codex Desktop on Windows repeatedly terminated while its automatic Git review/turn-diff processing handled an unusually large staged diff. Crashpad classified every retained crash as an Electron browser-process crash.

This may share underlying symptoms with #41268 and appears related to the Git review/output-pressure reports in #35776 and #30820, but this report isolates a reproducible workload characteristic: very large generated diff output.

Environment

• Windows 11 x64
• Codex Desktop Microsoft Store package: 26.903.8094.0
• ChatGPT.exe / Chromium: 152.0.7977.83

Observed behavior

• The complete desktop app crashed five times within roughly 20 minutes.
• Each retained Crashpad sidecar reported capture_kind=crash, ptype=browser, and osarch=x86_64.
• Desktop logs ended abruptly without a fatal JavaScript exception.
• Windows had no matching Application Error/WER event.

Workload immediately preceding the crashes

• The workspace had roughly 264,000 staged added lines.
• Eight generated NDJSON files were approximately 33.5 MB each.
• Codex's automatic review-summary / turn-diff Git processing captured approximately 101 MB of git diff output.

The timing and repeated browser-process classification suggest output volume or memory pressure in the automatic review path. This is a correlation, not a confirmed native root cause.

Local containment

Adding the following rule made Git treat the generated records as non-diffable and prevented their bodies from entering Codex's review diff:

*.ndjson -diff

I have not reproduced the crash since applying that containment yet, so I am not claiming it as a confirmed fix.

Expected behavior

Automatic Git review/status processing should cap or stream large output and fail gracefully. A large staged diff should not terminate the Electron browser/main process or the full desktop application.

Start by reproducing the review-summary/turn-diff Git path with the described large staged NDJSON workload, then inspect the Crashpad browser-process reports and abrupt desktop logs. Done means automatic Git review/status processing handles large output without terminating the Electron browser or desktop app, either through bounded output or graceful failure.