System I/O error when manipulating mailbox

Hi all,

Using Thunderbird 115.3.1 on Ubuntu 20 I accidentally moved a shared 
"support" mailbox folder to my personal inbox.

As a result it became inaccessible to everyone else. The folder is 
pretty big and contains over 200k messages going back 15 years or so.

Since I couldn't find a way to move it back to the parent folder I 
deleted it in Thunderbird and restored the folder from backups with no 
success. I.e. I have the data but Cyrus doesn't recognise it.

Next I tried creating an empty folder with the same name so at least new 
messages could come in.

Now when I try to open this empty folder I get:

Oct 17 12:58:25 mailserver cyrus/imaps[6478]: IOERROR: opening index 
support: System I/O error
Oct 17 12:58:25 mailserver cyrus/ctl_cyrusdb[12131]: checkpointing cyrus 
databases
Oct 17 12:58:25 mailserver cyrus/ctl_cyrusdb[12131]: done checkpointing 
cyrus databases
Oct 17 12:58:25 mailserver cyrus/imaps[12084]: starttls: TLSv1.2 with 
cipher DHE-RSA-AES256-SHA (256/256 bits new) no authentication
Oct 17 12:58:25 mailserver cyrus/imaps[6478]: IOERROR: opening index 
support: System I/O error

I also get different errors with cyradm tools when trying to delete this 
empty folder:

localhost.localdomain> dm support
deletemailbox: Permission denied

localhost.localdomain> setaclmailbox support root x
setaclmailbox: root: x: System I/O error

How do I recover from this situation?

How about restoring a mailbox folder to a different name?

My Cyrus version 2.4.16 on Debian.

Regards,
Adam





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