ChatGPT Atlas repeatedly crashes on macOS when iCloud Passwords extension is enabled (Chrome crash pattern reproduced inside Atlas)

ChatGPT Bugs
1

Hi everyone,

I’ve been experiencing persistent, reproducible crashes in ChatGPT Atlas on macOS, and after several days of testing, I believe the issue is directly connected to the iCloud Passwords extension.

I found only one previous post on this topic, but there was no follow-up — so I’m opening a new thread with more detailed information, logs, and testing steps.

Environment

  • macOS 26.1 (Apple Silicon)

  • ChatGPT Atlas – latest version (updated automatically)

  • Chrome installed with iCloud Passwords extension enabled

  • Other Chrome extensions: Antigravity, Fathom Analytics, AI Notetaker for Google Meet
    (none of them show any correlation with crashes)

Symptoms

  • Atlas quits 2–3 times per day with no visible error message.

  • The crash behavior is abrupt: Atlas simply disappears and macOS suggests reopening it.

  • When checking Chromium logs and macOS crash reports, the crash signature always points to:

EXC_BAD_ACCESS (SIGSEGV)
KERN_INVALID_ADDRESS
Thread: CrBrowserMain
  • The crash happens inside Chromium’s GPU/Metal pipeline, with repeated references to:
AGXMetalG16G_B0.bundle

Key discovery

Chrome itself also crashes in the same way when the iCloud Passwords extension is active.

This strongly suggests:

→ The iCloud Passwords extension triggers a sync or keychain-related crash in the Chromium security sandbox.

→ Atlas (being Chromium-based) inherits the exact same vulnerability.

→ The crash occurs at the OS/privileged-service level, not within an ordinary tab process.

The crash reports show the same behavior in both Chrome and Atlas:
main browser process dies with an invalid memory access originating in the macOS iCloud sync daemon / GPU pipeline.

Tests performed

I tested each extension one by one:

  • :cross_mark: iCloud Passwords ON → Atlas crashes multiple times/day

  • :check_mark: iCloud Passwords OFF → Atlas remains stable

  • All other extensions have no observable effect

  • Clearing Atlas’s cache, resetting the profile, or launching Atlas with GPU flags has no effect (Atlas does not seem to accept Chromium flags via CLI or Local State)

I also inspected:

  • ~/Library/Application Support/com.openai.atlas

  • Local State and Preferences
    → No way to inject GPU or sandbox flags; Atlas seems to ignore custom Chromium arguments.

Conclusion

There appears to be a compatibility issue between the iCloud Passwords extension and ChatGPT Atlas on macOS, replicating a known problem with Chrome but with stronger impact due to Atlas’s integration of Chromium inside a controlled environment.

This makes Atlas unstable for any user relying on iCloud Keychain syncing across Safari / Chrome / iOS.

Request

Could the Atlas team confirm:

  1. Whether Atlas currently supports the iCloud Passwords extension?

  2. Whether the iCloud Keychain sync daemon (com.apple.securityd / icloud-passwords) is known to conflict with Chromium-based wrappers?

  3. Whether a fix or workaround is planned?

  4. Whether Atlas will eventually support Chromium launch flags (to allow disabling GPU or sandbox layers)?

I can share full crash logs if needed.

Thanks — happy to provide any additional diagnostics that might help.

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