Bug#1128177: gvfs-daemons: exception in callback MulticastHandler.read_socket()

[Simon McVittie]

Control: retitle -1 wsdd: ValueError: badly formed hexadecimal UUID string
Control: reassign -1 wsdd
Control: affects -1 + gvfs-daemons

On Mon, 16 Feb 2026 at 07:49:59 +0100, Francesco Potortì wrote:
>I see this in syslog, with apparently no consequence
>
>7.9516 gvfsd: 2026-02-15 04:52:17,950:asyncio ERROR(pid 44919): Exception in callback MulticastHandler.read_socket()
>7.9517 gvfsd: handle: <Handle MulticastHandler.read_socket()>
>7.9517 gvfsd: Traceback (most recent call last):
>7.9517 gvfsd:   File "/usr/lib/python3.13/asyncio/events.py", line 89, in _run
>7.9517 gvfsd:     self._context.run(self._callback, *self._args)
>7.9517 gvfsd:     ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>7.9517 gvfsd:   File "/usr/bin/wsdd", line 330, in read_socket
>7.9518 gvfsd:     handler.handle_packet(msg.decode('utf-8'), address)
>7.9518 gvfsd:     ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>7.9518 gvfsd:   File "/usr/bin/wsdd", line 742, in handle_packet
>7.9518 gvfsd:     self.handle_message(msg, src)
>7.9518 gvfsd:     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
>7.9518 gvfsd:   File "/usr/bin/wsdd", line 534, in handle_message
>7.9518 gvfsd:     retval = handler(header, body)
>7.9518 gvfsd:   File "/usr/bin/wsdd", line 769, in handle_hello
>7.9519 gvfsd:     self.perform_metadata_exchange(endpoint, xaddr)
>7.9519 gvfsd:     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
>7.9519 gvfsd:   File "/usr/bin/wsdd", line 857, in perform_metadata_exchange
>7.9519 gvfsd:     self.handle_metadata(stream.read(), endpoint, xaddr)
>7.9519 gvfsd:     ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>7.9519 gvfsd:   File "/usr/bin/wsdd", line 866, in handle_metadata
>7.9519 gvfsd:     device_uuid = str(uuid.UUID(endpoint))
>7.9520 gvfsd:                       ~~~~~~~~~^^^^^^^^^^
>7.9520 gvfsd:   File "/usr/lib/python3.13/uuid.py", line 181, in __init__
>7.9520 gvfsd:     raise ValueError('badly formed hexadecimal UUID string')
>7.9520 gvfsd: ValueError: badly formed hexadecimal UUID string

This appears to be logged by wsdd (which gvfsd runs as a subprocess if 
available) rather than by gvfsd itself: reassigning.

Probably this indicates that some device on your network has an invalid 
UUID, or a UUID in a format that wsdd wasn't expecting, and wsdd should 
perhaps be more robust against that.

     smcv