Comment 199 for bug 883459

(In reply to Andreas Mahel from comment #179)
> I'm experiencing email duplication after filter activity as well (openSUSE
> Tumbleweed, most recent versions).
>
> The filters move mainly mailing list traffic from a POP3 account into local
> sub folders.
>
> Duplication happens both for automatic filtering as well as executing the
> filters manually.
>
> In most cases, the duplicated entry shows a different size than the original
> one (but not always).
>
> On top, selecting any of the two entries will result in Kmail endlessly
> waiting for Akonadi.
>
> A akonadictl fsck and vacuum does not remove the duplicates; also a "Remove
> duplicate emails" from the "Folder" menu does'nt, and ends with an error
> message.
>
> In the meantime I have deleted the Akonadi database several times, as well
> as re-created the filters manually, to no avail.
>
> As a workaround for myself I've written a short SQL script to show / delete
> the offending rows from the database (from within akonadiconsole) - this is
> tedious, but at least allows me to read all mails.
>
> (How) can I gather more information about what exactly is going on? Both
> Kmail and Akonadi are kind of cryptic in their output - is there a way to
> increase verbosity?

Exactly as you describe. Sometimes I can get things going again for a short time by doing a restart of akonadi, but lately more often than not this causes akonadi to crash.

Weird thing though; in some sub-folders the "delete duplicates" functionality works fine, in other sub-folders (underneath the same account) it will indeed hang everything solid with an error message at the end, just like you describe.