[kmail2] [Bug 322958] New: KMail unuseable, eats CPU - endless loop "Emitting defaultFoldersChanged"

[Christian Boltz]

https://bugs.kde.org/show_bug.cgi?id=322958

            Bug ID: 322958
           Summary: KMail unuseable, eats CPU - endless loop "Emitting
                    defaultFoldersChanged"
    Classification: Unclassified
           Product: kmail2
           Version: 4.11 rc2
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: kde-bugs at cboltz.de

(also reported as https://bugzilla.novell.com/show_bug.cgi?id=830661 )

I'm using openSUSE Factory + KDE:Distro:Factory repo (contains KDE 4.10.97 =
4.11 rc2). The symptoms first appeared a week ago with openSUSE Factory and KDE
4.10.90.

KMail is unuseable because:
- kmail, akonadiserver and mysql eat up my cpu 
- kmail takes ages to display a mail (more than a minute) 
  (the list of mails in a folder is displayed quickly when changing folders)
- it's impossible to send a mail - the composer window stays open (greyed out)
forever, but the mail isn't sent (I killed kmail after maybe 10 minutes)

In other words: KMail from KDE 4.10.9x is completely unuseable on my system :-(
- I have to use webmail for now.

This happens with an existing user, with some GB of mails.
(With a new test user, KMail doesn't eat up the CPU - but the test user does
not have any mails.)

After enabling debugging, kmail prints the following lines in the konsole in an
endless loop:

kmail2(8128)/libakonadi Akonadi::SpecialCollectionsPrivate::emitChanged:
Emitting defaultFoldersChanged.
kmail2(8128)/libakonadi Akonadi::SpecialCollectionsPrivate::emitChanged:
Emitting changed for "akonadi_maildir_resource_1"

Any ideas how to get a useable KMail again are more than welcome ;-)

Reproducible: Always

Steps to Reproduce:
1. start KMail on my system (yes, I know this isn't very helpful - sorry for
that ;-)

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