[Akonadi] [Bug 382253] New: Akonadi restart required to see new email in kmail

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https://bugs.kde.org/show_bug.cgi?id=382253

            Bug ID: 382253
           Summary: Akonadi restart required to see new email in kmail
           Product: Akonadi
           Version: 5.5.2
          Platform: Neon Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: Gmail resource
          Assignee: dvratil at kde.org
          Reporter: thatskinnywhiteguy+kde at gmail.com
                CC: kdepim-bugs at kde.org
  Target Milestone: ---

As many as several times per day, KMail stops getting emails from a Google
resource (the only resource currently configured) using IMAP/SMTP. Restarting
akonadi (`akonadictl restart`) generally fixes it.

If I leave the terminal I used to restart akonadi open, I see a long list of
errors that might be relevant. With some filtering intended to ignore kgapi
errors, which are from a different resource and probably not relevant, and to
protect my privacy, here are some examples:

org.kde.pim.akonadicore: Deleting items from the akonadi database failed: "No
items found"
!org.kde.pim.akonadiserver: Payload file 
"/home/peter/.local/share/akonadi/file_db_data/25/16125_r3"  could not be open
for reading!
org.kde.pim.akonadiserver: Error:  "No such file or directory"
org.kde.pim.akonadiserver: Payload file 
"/home/peter/.local/share/akonadi/file_db_data/24/16124_r3"  could not be open
for reading!
org.kde.pim.akonadiserver: Error:  "No such file or directory"
org.kde.pim.akonadiserver: Payload file 
"/home/peter/.local/share/akonadi/file_db_data/50/16350_r1"  could not be open
for reading!
org.kde.pim.akonadiserver: Error:  "No such file or directory"
org.kde.pim.akonadiserver: Payload file 
"/home/peter/.local/share/akonadi/file_db_data/48/16348_r1"  could not be open
for reading!
org.kde.pim.akonadiserver: Error:  "No such file or directory"
org.kde.pim.akonadiserver: Payload file 
"/home/peter/.local/share/akonadi/file_db_data/53/16353_r1"  could not be open
for reading!
org.kde.pim.akonadiserver: Error:  "No such file or directory"
(There are many more lines like this)

org.kde.pim.akonadicore: Creating/updating items from the akonadi database
failed: "Unknown error."
(Many copies of this last line)

org.kde.pim.akonadicore: Creating/updating items from the akonadi database
failed: "Multiple merge candidates, aborting"
org.kde.pim.akonadicore: Error during ItemSync:  "Multiple merge candidates,
aborting"

It seems unlikely to be a duplicate of #343114 but I thought I'd mention it in
case it is; the two do seem to have some superficial similarities.

After a while, this became bad enough that I removed the resource entirely and
re-authenticated (especially obnoxious because I had to make a new
application-specific password for SMTP). It worked like a dream for a week or
two and then the same problem cropped up with increasing frequency.

Note: I'm not really sure which version number to report. KMail says that it's
5.5.2 but apt says that it's 4:17.04.2-0neon+16.04+xenial+build23.
akonadiconsole says it's 0.99. In both applications, the Libraries tab of the
About window reports that the version of the KDE Frameworks is 5.35.0. Apt
reports version 4:17.04.2-0neon+16.04+xenial+build31 for the akonadi-server
package. I'm running a vanilla installation of KDE Neon.

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