Comment 33 for bug 862483

I've managed to view some of the emails by killing the mixedmail resource and (re)starting it manually in the console several times.

From this I've figured out that the mixedmail resource gets stuck on something.

Once I start it kmail shows the messages. Then I browse around the folders to display random messages: after several clicks it starts slowing down and after a few more it gets stuck totally. From that point on no more messages are viewable
(even the ones that were visible before can't be viewed).

When the bug is triggered (that is kmail displays the "Retrieving Folder Contents" message for the first time) the resource stays quiet for some seconds and then spits out a lot of messages similar to this one:

akonadi_mixedmaildir_resource_1(8900)/akonadiresource (maildir) RetrieveItemsJob::Private::fetchChangedResult: Store fetch for changed item "1323661243.R144.spyro" in collection -869 , "" did not return the expected item. error= 102 , "Given folder name is empty"
akonadi_mixedmaildir_resource_1(8900)/akonadiresource (maildir): "Given folder name is empty" collection: Collection ID: -12556 remote ID: ""
   name: ""
   url: KUrl("akonadi:?collection=-12556")
   parent: -869 ""
   resource: ""
   rights: QFlags(0x1|0x2|0x4|0x8|0x10|0x20)
   contents mime type: ()
    CachePolicy:
   inherit: true
   interval: -1
   timeout: -1
   sync on demand: false
   local parts: ()
    CollectionStatistics:
   count: -1
   unread count: -1
   size: -1
akonadi_mixedmaildir_resource_1(8900)/akonadiresource (maildir) RetrieveItemsJob::Private::fetchChangedResult: Store fetch for changed item "1323661243.R175.spyro" in collection -869 , "" did not return the expected item. error= 102 , "Given folder name is empty"

From that point the resource is stuck. The error messages from a previous mail suggest that it doesn't answer at all to DBUS queries.

I haven't found a clear and systematic way to reproduce the issue.
Earlier I've reproduced it by opening a specific folder and clicking an email inside it. But then after a restart the same action didn't trigger the problem.

However it might be something related to timing. In particular I can trigger it very easily shortly after the akonadi server and mysql have been restarted. This is possibly because the caches are empty and take time to be filled. After I kill and restart the mixedmail resource several times, however, the bug hits less and less until I can
browse all my folders and view all my messages.

Weird.