25.10.1 - Error when starting SMB service - [EFAULT] string indices must be integers, not 'str'

TrueNAS General
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1

After updating to 25.10.1 from 25.04.2.6, the SMB service is no longer able to start from the UI. The error produced is:

[EFAULT] string indices must be integers, not ‘str’

I have disabled all SMB shares in an attempt to troubleshoot but the error is still produced when starting SMB from the UI.

Happy to provide any information necessary for troubleshooting.

2

See details in the forums release notes: 25.10.1 - 2026 January 2

3

Thanks.

Read through the notes there. Solution was:

Analyze output of midclt call datastore.query sharing.cifs_share | jq

Identify entries that do not have base64(?) encoded string in cifs_share_acl - items that look like “S-1-1-0:ALLOWED/0x0/FULL” are bad now

In Shares UI, edit Share ACL on the items. Just click “Save” on each of them.

Analyze output of midclt call datastore.query sharing.cifs_share | jq and ensure that all entries have encoded string instead of “S-1-1-0:ALLOWED/0x0/FULL” format

SMB service now starts without issue

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4

Thank you @snorpleblar This caught me out - upgraded to 25.10.1 a few days back (my config goes back years). All working fine (mostly; CPU graph issues are back) - made a minor SMB change, was not expecting it not to start again. Thank goodness for this post, to decrypt what was wrong, and what I had to do - I would never had got there on my own. I am getting more used to the shell to fix stuff - but this felt avoidable.

Thanks
CC

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