[Bug 1526529] [NEW] akonadi 4:15.08.2-0ubuntu1 fails to read updates from IMAP server, reporting "log_kimap: Socket timeout!"

[smihaila]

Public bug reported:

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.

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

I can determinstically reproduce the bug by right-clicking the root of
the e-mail folder for my IMAP account in the KDE Mail's left-side folder
view and selecting the "Update this folder and all its subfolders"
option.

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

** Affects: akonadi (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1526529

Title:
  akonadi 4:15.08.2-0ubuntu1 fails to read updates from IMAP server,
  reporting "log_kimap: Socket timeout!"

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