Cursor CLI throwing SQLITE_IOERR: disk I/O error

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Update!

What I checked

  • Disk space/inodes are fine and $HOME is writable. /tmp has correct perms (1777).

  • SQLite integrity check on the DB returns ok.

  • My home lives on a shared filesystem:
    home on /home/aiops type virtiofs (rw,relatime)

What happens
With the DB on virtiofs, cursor-agent throws SQLITE_IOERR: disk I/O error.

Workaround that fixes it
If I move the app data + temp dirs to a local ext4 volume, the error disappears. For example:

mkdir -p /var/tmp/$USER/{.local/share,.config,tmp}
export XDG_DATA_HOME=/var/tmp/$USER/.local/share
export XDG_CONFIG_HOME=/var/tmp/$USER/.config
export TMPDIR=/var/tmp/$USER/tmp
export SQLITE_TMPDIR=$TMPDIR

cursor-agent <my usual command>

After doing this, cursor-agent works normally. This strongly suggests the issue is with SQLite file locking/IO semantics on virtiofs rather than storage/permissions.

Thanks for your answer.