[Akonadi] [Bug 356751] New: akonadi 4:15.08.2-0ubuntu1 fails to read updates from IMAP server, reporting "log_kimap: Socket timeout!"

[smihaila via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=356751

            Bug ID: 356751
           Summary: akonadi 4:15.08.2-0ubuntu1 fails to read updates from
                    IMAP server, reporting "log_kimap: Socket timeout!"
           Product: Akonadi
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: smihaila at gmail.com

After recently upgrading from Kubuntu 14.04 Trusty to 15.10 Willy, the
akonadi-server is no longer able to sync the local store (MySql-hosted) to the
IMAP server, for certain IMAP server folders, reporting an error message like
this:

log_imapresource: Starting retrieval for
"{folder_name_omitted_for_privacy_reasons}"
log_imapresource: Starting message retrieval. Elapsed(ms): 4112
log_imapresource: MessageCount: 1975 Local message count: 0
log_imapresource: UidNext: 1979 Local UidNext: 1979
log_imapresource: HighestModSeq: 0 Local HighestModSeq: 0
log_imapresource: Detected inconsistency in local cache, we're missing some
messages. Server: 1975 Local: 0
log_imapresource: Refetching complete mailbox.
akonadiagentbase_log: 1975
1975
log_imapresource: Fetching 1 intervals
Received: 1 In total: 1 Wanted: 1975
Received: 1 In total: 2 Wanted: 1975
Received: 1 In total: 3 Wanted: 1975
[...]
Received: 1 In total: 44 Wanted: 1975
Received: 1 In total: 45 Wanted: 1975

<== and here it hangs for a while and then it reports the error seen below:

log_kimap: Socket timeout!
log_kimap: close
log_imapresource: online= true
log_imapresource: online= false
log_imapresource:
log_imapresource: Cancel task: "killed"
The item sync is being rolled-back.
log_imapresource: online= true
log_imapresource: Fetch job failed "Connection to server lost."
Pass a valid window to KWallet::Wallet::openWallet().
log_kimap: KIMAP::LoginJob(0x100c4d0)
log_kimap: connectToHost "localhost" 1143
finished
log_imapresource: Cancelling this request. Probably there is no connection.
log_kimap: close

...And after a while the cycle repeats itself - akonadi will issue another IMAP
login command and re-try from the beginning to sync itself up with the IMAP
server - trying to read 1975 message items and bailing out at item #45.

This issue was not occurring with the akonadi version that came up with Kubuntu
14.10 Trusty.

Please help, now my e-mail send & receive capabilities are disfunctional, and I
cannot use Akonadi and KDE Mail anymore.



Reproducible: Always

Steps to Reproduce:
1. Fire up a Konsole shell and run: `akonadictrl restart`.
2. Keep this Konsole shell open, in order to see messages logged by the
akonadi-server.
3. Launch the KDE mail (kmail2 5.0.2) application.
4. Select the root of the e-mail folder for my IMAP account in the KDE Mail's
left-side folder view.
5. Right-clicking that root IMAP folder and select the "Update this folder and
all its subfolders" option.

Actual Results:  
1. Observe the error message reported in the Konsole shell.
2. Note how the KDE mail application's message progress toolbar on the
bottom-left does not get to 100%. Also observe how new messages in Inbox or
other folders do not get downloaded (not even the header).
3. Also any message deletions that were performed locally, do not seem to be
propagated to the IMAP server, and when accessing the IMAP server in a more
direct way i.e. via a web-based client provided by the MS Exchange Server
implementing the actual IMAP listener, the messages that were supposed to be
erased, are still listed there.


Expected Results:  
1. akonadi-server should be able to complete the message retrieval/sync-up i.e.
not getting stuck at "Received: 1 In total: 45 Wanted: 1975" log line and no
socket error or pending background retrieval job getting auto-canceled.
2. KDE mail should able to finalize the message donwload/syncup progress bar
and show new messages.
3. Any message deletions that happened locally, at KDE mail app level (i.e.
delete some messages from Inbox - either new or old) should be taken into
consideration by the IMAP server (either after the next send/receive cycle
which in this care is set to happen at each 5-minute interval, or upon explicit
"Synchronize this folder and all of its subfolders content").

A similar bug was submitted here:
https://bugs.launchpad.net/ubuntu/+source/akonadi/+bug/1526529

The IMAP server is a DavMail java process running locally, and acting as a
bridge to a corporate Microsoft Exchange server.

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