[Akonadi] [Bug 472833] New: Akonadi tasks take up 25% CPU sitting idle

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https://bugs.kde.org/show_bug.cgi?id=472833

            Bug ID: 472833
           Summary: Akonadi tasks take up 25% CPU sitting idle
    Classification: Frameworks and Libraries
           Product: Akonadi
           Version: unspecified
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: tnemeth at free.fr
                CC: carl at carlschwan.eu
  Target Milestone: ---

Created attachment 160642
  --> https://bugs.kde.org/attachment.cgi?id=160642&action=edit
CPU load before killing akonadi

SUMMARY
When running idle I've noticed that recently, after a few upgrades in QT/plasma
packages, my CPU fan was blowing faster than before. The CPU monitor showed me
that there was a permanent CPU load of 25% which wasn't there before. After
investigating, I found the culprit : akonadi and all its tasks where busying my
system, even after several hours, while all the processing of startup, mails
reception, had already been done. File indexing is deactivated on my system.


STEPS TO REPRODUCE
1. Log in a session that has kmail configured with a few accounts and wait a
few minutes
2. Look at the CPU monitor


OBSERVED RESULT

The CPU load is way too high...

EXPECTED RESULT

The CPU load should be around 1 or 2 %...

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.10
Kernel Version: 6.4.0-1-amd64 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i7-7567U CPU @ 3.50GHz
Memory: 31.2 Gio of RAM
Graphics Processor: Mesa Intel® Iris® Plus Graphics 650
Manufacturer: Intel Corporation
Product Name: NUC7i7BNH
System Version: J31153-308

ADDITIONAL INFORMATION
I've taken a few screenshots and `ps aux` outputs...

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