Upgraded yesterday from 7.2.3 and wasn't having issues until I went to play some music from Music Assistant. It's using the SMB mount options and was working fine before the upgrade. No other changes to my system.

Screenshot of my MA SMB settings attached.

Edited March 5Mar 5 by Halstead

More concerning if predictable update:
I've also noticed that the SMB mount HA was using for backups no longer mounts. As before, nothing has changed other than the update to 7.3.4.

Does it work if you downgrade back to 7.2.3?

7 hours ago, JorgeB said:

Does it work if you downgrade back to 7.2.3?

I was bitten by the Time Machine bug, so a rollback isn't something I want to to. ID love to hear other troubleshooting recommendations first.

The Samba version was downgraded to fix the TM bug, but that by itself should not cause that issue. Also, I haven't seen any other reports, so I suspect the upgrade wasn't the problem.

If you create a new VM, can you access the share?

Getting the same issue on a new test VM, attempting to mount the backups share. Here's the HA log entry:

Logger: homeassistant.components.hassio
Source: components/hassio/websocket_api.py:138
Integration: Home Assistant Supervisor (documentation, issues)
First occurred: 1:40:32 PM (14 occurrences)
Last logged: 2:00:42 PM

• Failed to to call /mounts - does not match regular expression ^[^\\\/]+ for dictionary value @ data['share']. Got '/Backups/Home Assistant'

• Failed to to call /mounts - Mounting unraid_backups did not succeed. Check host logs for errors from mount or systemd unit mnt-data-supervisor-mounts-unraid_backups.mount for details.

• Failed to to call /mounts - Mounting unraid__backup did not succeed. Check host logs for errors from mount or systemd unit mnt-data-supervisor-mounts-unraid__backup.mount for details.

• Failed to to call /mounts - Mounting Audio did not succeed. Check host logs for errors from mount or systemd unit mnt-data-supervisor-mounts-Audio.mount for details.

• Failed to to call /mounts - some but not all values in the same group of inclusion 'basic_auth' @ data[<basic_auth>]. Got None

11 hours ago, Halstead said:

does not match regular expression ^[^\\\/]+ for dictionary value @ data['share']. Got '/Backups/Home Assistant'

The error logs point to two an invalid naming syntax issue. The space in Home Assistant is likely triggering that "regular expression" error you saw in the logs (^[^\\\/]+)

Instead of Backups\Home Assistant\ for the remote share, try using just Backups without any backslash.

5 hours ago, JorgeB said:

The error logs point to two an invalid naming syntax issue. The space in Home Assistant is likely triggering that "regular expression" error you saw in the logs (^[^\\\/]+)

Instead of Backups\Home Assistant\ for the remote share, try using just Backups without any backslash.

Tried that. Same error. And FWIW, the path has been the same for years with no issue.

Post a new log from the VM, and also the Unraid syslog after the attempt.

Ok, I have figured it out. For some reason, the guest credentials stopped working in 7.2.4. I created a new user and entered that user's name & password into the appropriate sections (they were blank before), and I can now mount shares.