Smart plugin: a USB-bridged disk (e.g. -d usbsunplus) crashes the web server at startup #3806

Check the bug

I searched the issues for "Unknown interface" and found no match. #2916 is related to the smart plugin but is a different problem.

Describe the bug

When the smart plugin is enabled and smartctl --scan reports a device type that pySMART does not accept, Glances exits during the first stats update. The web server never comes up, and under Docker restart: unless-stopped the container restart-loops.

Here the trigger is a USB disk behind a Sunplus SPIF30x SATA bridge (1bcf:0c31). smartctl 7.5 reports it as:

/dev/sda -d usbsunplus # /dev/sda [USB Sunplus], ATA device
/dev/nvme0 -d nvme # /dev/nvme0, NVMe device

pySMART 1.4.3's Device.__init__ accepts only the types in smartctl_type_dict (ata, csmi, nvme, sas, sat, sata, scsi, atacam, sntasmedia, plus megaraid,N). Any other type smartctl emits for a USB bridge raises ValueError, including usbsunplus, usbjmicron, usbcypress and usbprolific:

  File "/app/glances/plugins/smart/__init__.py", line 171, in get_smart_data
    devlist = DeviceList()
  File "/venv/lib/python3.14/site-packages/pySMART/device_list.py", line 50, in __init__
    self.initialize(catch_errors)
  File "/venv/lib/python3.14/site-packages/pySMART/device_list.py", line 125, in initialize
    raise e
  File "/venv/lib/python3.14/site-packages/pySMART/device_list.py", line 114, in initialize
    Device(name, interface=interface, smartctl=self.smartctl))
  File "/venv/lib/python3.14/site-packages/pySMART/device.py", line 79, in __init__
    raise ValueError(
        'Unknown interface: {0} specified for {1}'.format(interface, name))
ValueError: Unknown interface: usbsunplus specified for /dev/sda

get_smart_data() catches only (TypeError, FileNotFoundError), so the ValueError reaches GlancesMode.__init__ -> stats.update() and kills the process. The [smart] show/hide options cannot help, because they filter after DeviceList() has already raised. The same code is still on develop in glances/plugins/smart/data.py (get_smart_data). 8b458ff fixed the FileNotFoundError variant of this crash.

To Reproduce

1. Attach a disk whose smartctl --scan line uses a USB bridge type, such as -d usbsunplus.
2. Start Glances with -w --enable-plugin smart as root (for example, in nicolargo/glances:latest-full with pid: host and privileged: true).
3. Glances exits with the traceback above.

Expected behavior

An unsupported device is skipped, and SMART data for the other devices is still shown. The web server starts either way.

Suggested fix

Call DeviceList(catch_errors=True). pySMART then logs the failing device and continues with the rest. The narrow except would still turn on import_error_tag for the remaining whole-list failures, which disables the plugin for every device. Alternatively, add ValueError to the caught exceptions, but that loses the healthy devices too.

Environement

• Operating System: Ubuntu 26.04.1 LTS (host), kernel 7.0.0-38-generic
• Glances & psutil versions: Glances 4.5.8, API 4, psutil 7.2.2; pySMART 1.4.3; smartmontools 7.5
• How do you install Glances: Docker image nicolargo/glances:latest-full (built 2026-10-11)
• Glances test: not run; the process exits before it can report

Additional context

As a workaround, I disabled the smart plugin ([smart] disable=True and no --enable-plugin smart).