Nemo hangs indefinitely on startup when a GVFS MTP mount is stale/unresponsive #3834

Distribution

Linux Mint 22.3 (Zena), Cinnamon edition

Package version

22.3

Frequency

Quite often

Bug description

Nemo hangs completely on startup (observed >3 minutes, no error message, no feedback) when a mounted MTP device (via gvfsd-mtp) has become unresponsive. This appears to be rooted in GVFS itself (see linked issue), but Nemo's blocking, silent behavior on the frontend makes it hard to diagnose - there's no indication to the user of what it's waiting on.

Steps to reproduce

Steps to reproduce:

Connect an Android device via USB, let it mount via MTP
Let the device go stale/unresponsive without formally unmounting it
Run nemo

Expected behavior

Expected behavior:
Nemo should either time out gracefully on unresponsive mounts, or at least surface a message/log entry indicating it's stuck waiting on a specific mount, instead of hanging silently.

Additional information

Actual behavior:
Nemo hangs indefinitely with no visible cause. Diagnosis required checking gio mount -l and manually force-unmounting the stale mount.

Root cause (upstream): https://gitlab.gnome.org/GNOME/gvfs/-/work_items/876

Workaround:
gio mount -u mtp://[DEVICE_ID]/

System info:
Linux Mint 22.3 (Zena), Cinnamon edition
Nemo version: 6.6.3+zena
gvfs-backends: 1.54.4-0ubuntu1~24.04.2