Linux AppImage: Crashpad crashes with SIGBUS on exit #7429

HyperFrames Desktop's chrome_crashpad_handler intermittently crashes with SIGBUS during shutdown, triggering system crash notifications after the app has closed.

Observed with the official Linux x86_64 AppImage, build b480, on Omarchy/Arch Linux.

The core dump and journal show:

• Three Crashpad helpers crashed at the same moment their AppImage mounts were being torn down.
• The fault address matched the instruction pointer inside the helper's executable mapping from the AppImage mount.
• Desktop had already marked its session as closed.
• No OOM kill or relevant storage error was recorded around the event.

This suggests the AppImage filesystem becomes unavailable while Crashpad is still executing from it. That is the suspected mechanism, not a source-confirmed diagnosis.

Similar crashes were recorded across multiple sessions, but a deterministic reproduction is not established. Closing Desktop should finish shutting down its helpers without producing core dumps or crash notifications.