Since an update on ArchLinux in late October, KMail crashes quite often when moving mails between folders, e.g. when sorting mails form Inbox to some other folder. According to the package manager, both kmail and Akonadi have the version number 22.08.3-1.

To collect information, I stopped Akonadi (akonadictl stop) and restarted it in a console to see any relevant debug output during a crash. Same with kmail. No special settings for extra debug output e.g. via kdebugsettings were made.

Akonadi made only some initial output but nothing later or during a crash. kmail, however, gave the following output. I think but are not sure that the output up to the last "DispatchModeAttribute" was before the crash.

Error loading text-to-speech plug-in "speechd"
org.kde.pim.mailtransportakonadi: Item doesn't have DispatchModeAttribute.
 d->folderTreeWidget->selectedCollection() Collection ID: 199    remote ID: "AAMkADdjYzdhYjJkLTBjNGItNDRhZS05NjZjLWIxNzY5OTI2MTllNwAuAAAAAAA5OWMvCOhAR7niCe/yxRIKAQCzEcl00IXvRLelEuHv21iGAAAAxUoQAAA=" 
    name: "Personal" 
    url: QUrl("akonadi:?collection=199") 
    parent: 38 "AAMkADdjYzdhYjJkLTBjNGItNDRhZS05NjZjLWIxNzY5OTI2MTllNwAuAAAAAAA5OWMvCOhAR7niCe/yxRIKAQCzEcl00IXvRLelEuHv21iGAAAAxTaMAAA=" 
    resource: "akonadi_ews_resource_0" 
    rights: QFlags<Akonadi::Collection::Right>(AllRights) 
    contents mime type: ("message/rfc822", "inode/directory") 
    isVirtual: false 
     CachePolicy: 
    inherit: true 
    interval: -1 
    timeout: -1 
    sync on demand: false 
    local parts: () 
     CollectionStatistics:
       count: 3620 
       unread count: 1 
       size: 561984064
org.kde.pim.mailtransportakonadi: Item doesn't have DispatchModeAttribute.
malloc(): mismatching next->prev_size (unsorted)
*** KMail got signal 6 (Exiting)
*** Dead letters dumped.
malloc(): unaligned fastbin chunk detected

Let me know if I should try to re-create the crash with some additional debug settings enabled.