Akonadi server reproducibly eats 10+ GB of memory

[Szőts Ákos]

I'm really sorry, I had a BKO account but had it closed, and don't
want to reopen it. Unfortunately, this is all the help I could give to
you right now.

Perhaps, some more console messages:

Connecting to deprecated signal
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadicontrol: "AgentManager::agentInstanceSynchronize"
Agent instance  "akonadi_maildir_resource_0"  has no resource
interface!
QDBusConnection: name 'org.freedesktop.Akonadi.Control' had owner ''
but we thought it was ':1.2342'
org.kde.pim.akonadiserver: "Cannot connect to agent instance with
identifier 'akonadi_imap_resource_5', error message: ''"
QDBusConnection: name 'org.freedesktop.Akonadi.Control' had owner ''
but we thought it was ':1.2342'
QDBusConnection: name 'org.freedesktop.Akonadi.Control' had owner ''
but we thought it was ':1.2342'
QDBusConnection: name 'org.freedesktop.Akonadi.Control' had owner ''
but we thought it was ':1.2342'
[SASL-XOAUTH2] - Requesting authID![SASL-XOAUTH2] - Requesting token
![SASL-XOAUTH2] - filling prompts
![SASL-XOAUTH2] - Requesting authID![SASL-XOAUTH2] - Requesting token
!org.kde.pim.imapresource: Called item() while state holds multiple items!
org.kde.pim.imapresource: Called item() while state holds multiple items!
"Item query returned empty result set"
"Item query returned empty result set"
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: ""
[... repeated 84 times]
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge
candidates, aborting"
org.kde.pim.imapresource: Called item() while state holds multiple items!
org.kde.pim.imapresource: Called item() while state holds multiple items!
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: ""
[... repeated 50 times]
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge
candidates, aborting"
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: ""
[... repeated 50 times]
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge
candidates, aborting"
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: ""
[... repeated 14 times]
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge
candidates, aborting"
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: ""
[... repeated 50 times]
org.kde.pim.akonadicore: Creating/updating items from the akonadi
database failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge
candidates, aborting"