[Akonadi] [Bug 334269] New: Email retrieval comes to a full HALT after BatchFetcher::fetchNextBatch: fetchNextBatch called while fetch is in process error

[Raymond Wooninck]

https://bugs.kde.org/show_bug.cgi?id=334269

            Bug ID: 334269
           Summary: Email retrieval comes to a full HALT after
                    BatchFetcher::fetchNextBatch: fetchNextBatch called
                    while fetch is in process error
    Classification: Unclassified
           Product: Akonadi
           Version: GIT (master)
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: IMAP resource
          Assignee: chrigi_1 at fastmail.fm
          Reporter: tittiatcoke at gmail.com
                CC: kdepim-bugs at kde.org, vkrause at kde.org

With the latest commits regarding the IMAP resource last night (Friday May 2),
the email retrieval for gmail is no longer working. 

I have the following experience:

1) Email retrieval is very slow. Much slower than before
2) The debug output shows that for each folder all emails are retrieved in
batches until the moment that fetchNextBatch is called while a fetchBatch is
still active. At this moment, the IMAP resource NO longer retrieves any emails
and just comes to a full HALT.
3) You can stop the email retrieval at that moment, but with the next scheduled
one, this again comes to a HALT after the same message. 

The debug output in the console is :

akonadi_imap_resource_13(23100)/kdepimlibs (kimap)
BatchFetcher::fetchNextBatch: Fetching  57401  to  57500
akonadi_imap_resource_13(23100)/kdepimlibs (kimap)
BatchFetcher::fetchNextBatch: Fetching  57501  to  57600
akonadi_imap_resource_13(23100)/kdepimlibs (kimap)
BatchFetcher::fetchNextBatch: Fetching  57601  to  57700
akonadi_imap_resource_13(23100)/kdepimlibs (kimap)
BatchFetcher::fetchNextBatch: Fetching  57701  to  57800
akonadi_imap_resource_13(23100) BatchFetcher::fetchNextBatch: fetchNextBatch
called while fetch is in process 
akonadi_imap_resource_11(23099)/kdecore (KConfigSkeleton)
KCoreConfigSkeleton::writeConfig:
akonadi_imap_resource_10(23098)/kdecore (KConfigSkeleton)
KCoreConfigSkeleton::writeConfig:
akonadi_imap_resource_10(23098)/kdepimlibs (kimap)
RetrieveItemsTask::startRetrievalTasks: Starting retrieval for  "INBOX.Spam"
akonadi_imap_resource_11(23099)/kdepimlibs (kimap)
RetrieveItemsTask::startRetrievalTasks: Starting retrieval for  "INBOX.Trash"
akonadi_imap_resource_10(23098)/kdepimlibs (kimap)
RetrieveItemsTask::onFinalSelectDone: Starting message retrieval. Elapsed(ms): 
374
akonadi_imap_resource_10(23098)/kdepimlibs (kimap)
RetrieveItemsTask::onFinalSelectDone: MessageCount:  0 Local message count:  0
akonadi_imap_resource_10(23098)/kdepimlibs (kimap)
RetrieveItemsTask::onFinalSelectDone: UidNext:  1 Local UidNext:  1
akonadi_imap_resource_10(23098)/kdepimlibs (kimap)
RetrieveItemsTask::onFinalSelectDone: HighestModSeq:  1 Local HighestModSeq:  1


Reproducible: Always

Steps to Reproduce:
1. Try to retrieve emails
2.
3.
Actual Results:  
Emails are not retrieved and IMAP resource comes to a HALT

Expected Results:  
Emails are retrieved normally

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