[Akonadi] [Bug 393669] New: INBOX syncs always two times when entering INBOX (duration ~ 2 x 9 sec)

[Achim Bohnet]

https://bugs.kde.org/show_bug.cgi?id=393669

            Bug ID: 393669
           Summary: INBOX syncs always two times when entering INBOX
                    (duration ~ 2 x 9 sec)
           Product: Akonadi
           Version: 5.8.1
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: IMAP resource
          Assignee: chrigi_1 at fastmail.fm
          Reporter: ach at mpe.mpg.de
                CC: kdepim-bugs at kde.org
  Target Milestone: ---

Created attachment 112316
  --> https://bugs.kde.org/attachment.cgi?id=112316&action=edit
System load during 2 syncs

Reproducability: always.  With at least 5.6*, 5.7* and 5.8.0

Switch from any folder to the INBOX (imap to dovecot server).  The Status
widget in the lower right corner of kmail pops up and shows 2 syncs of the
inbox.
  * Each sync takes ~ 9 sec (INBOX: 4470 msgs, 407 MB) 
  * Systemmonitor: Download ~ 350 - 500 kB/sec peak (see attachment)
  * akonadi writes nothing to ~/.xsession-errors during the syncs
  * Folder properties

Running akonadictl show only 'not normal' logs: items without RID. 


 (0)ach at lap-allee:~$ akonadictl fsck
Looking for resources in the DB not matching a configured resource...
Looking for collections not belonging to a valid resource...
Checking collection tree consistency...
Looking for items not belonging to a valid collection...
Looking for item parts not belonging to a valid item...
Looking for item flags not belonging to a valid item...
Looking for overlapping external parts...
Verifying external parts...
Found 26640 external files.
Found 26640 external parts.
Found no unreferenced external files.
Checking size treshold changes...
Found 0 parts to be moved to external files
Found 0 parts to be moved to database
Looking for dirty objects...
Collection "Search" (id: 1) has no RID.
Collection "OpenInvitations" (id: 148) has no RID.
Collection "DeclinedInvitations" (id: 149) has no RID.
Collection "2018" (id: 196) has no RID.
Collection "Last Search" (id: 198) has no RID.
Found 5 collections without RID.
Item "2483" has no RID.
Item "43613" has no RID.
Item "47729" has no RID.
Item "47780" has no RID.
Item "47845" has no RID.
Item "47846" has no RID.
Item "47847" has no RID.
Item "47848" has no RID.
Item "47849" has no RID.
Item "47850" has no RID.
Item "52416" has no RID.
Item "53011" has no RID.
Item "53017" has no RID.
Item "53036" has no RID.
Item "53047" has no RID.
Item "53058" has no RID.
Item "53394" has no RID.
Item "58727" has no RID.
Found 18 items without RID.
Found 0 dirty items.
Looking for rid-duplicates not matching the content mime-type of the parent
collection
Checking Birthdays & Anniversaries
...

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