[Akonadi] [Bug 320420] New: Can not accessing email (or contacts) due to hung maildir resource updates .dat file

[Aaron J. Seigo]

https://bugs.kde.org/show_bug.cgi?id=320420

            Bug ID: 320420
           Summary: Can not accessing email (or contacts) due to hung
                    maildir resource updates .dat file
    Classification: Unclassified
           Product: Akonadi
           Version: GIT (master)
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: grave
          Priority: NOR
         Component: Maildir Resource
          Assignee: kdepim-bugs at kde.org
          Reporter: aseigo at kde.org

Sicnce the new bulk-updating code went in, approximately once a day I
experience a hand in Kontact where it can (usually) list all the mails in a
folder and all the folders, and the address book will list all the contact
names in the address book, but clicking on an email or a contact will not load
the relevant email or contact card in the viewer.

When this happens, trying to delete an email also returns an error about my
IMAP account not having an associated trash folder. This is odd as I do not
have IMAP set up :) see below:

My setup is as follows:

* POP3 server for incoming mail
* A couple dozen local mail filters, all of which match on to/cc/bcc (and for
some also the subject) and send incoming email into folders
* Local maildir storage in the default location

When this happens, I can exit Kontact, shut down akaondi, remove
~/.config/akonadi/agent_config_akonadi_maildir_resource_0_changes.dat and then
start everything up again and it once again functions correctly.

When hung, the maildir resource is simply waiting quietly in its event loop. It
is not stuck in a loop anywhere nor is it hung on a blocking call.

Using akonadiconsole, requests for emails simply go unanswered with no apparent
debug output in the debut panel (though I do get debug output for listing the
folders themselves, incoming email over pop3, filtering, etc)

Attached is an example .dat file which was on disk at the time of a breakage.

Reproducible: Sometimes

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