[Akonadi] [Bug 396663] New: Imap resource crashes when large amounts of emails is moved/deleted

[S.Trzmiel]

https://bugs.kde.org/show_bug.cgi?id=396663

            Bug ID: 396663
           Summary: Imap resource crashes when large amounts of emails is
                    moved/deleted
           Product: Akonadi
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: IMAP resource
          Assignee: kdepim-bugs at kde.org
          Reporter: xeno at x-s.com.pl
  Target Milestone: ---

Created attachment 114011
  --> https://bugs.kde.org/attachment.cgi?id=114011&action=edit
suspicious changes.dat file

I'm experiencing crash of imap account agent on my work account.
It happens when large amount of mails (in hundrets) is moved/deleted via
filtering or by hand.

KMail deletes messages locally then it tries to sync changes. 
Then akonadi_imap_resource process usage of CPU and mem skyrockets and finally
process crashes with SIGABRT. 

Observed anomaly:  agent_config_akonadi_imap_resource_8_changes.dat gets gets
larger than  changes.dat files for other imap accounts (file attached)

To recover I have to stop akonadi, remove changes.dat file and start akonadi
again.  

Maybe it is trying to delete messages that not exist anymore, or file just gets
corrupted.


Setup:
Fedora27
plasma: 5.12.6
KF5: 5.47.0
Apps: 17.12.3

Akonadi is using postgres db backend.

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