[Bug 309015] New: Kontact stops working on internet connection loss, KDE logout needed for recovery

[gustavo at angulosolido.pt]

https://bugs.kde.org/show_bug.cgi?id=309015

            Bug ID: 309015
          Severity: normal
           Version: 4.8.x
          Priority: NOR
          Assignee: kdepim-bugs at kde.org
           Summary: Kontact stops working on internet connection loss, KDE
                    logout needed for recovery
    Classification: Unclassified
                OS: Linux
          Reporter: gustavo at angulosolido.pt
          Hardware: Ubuntu Packages
            Status: UNCONFIRMED
         Component: mail
           Product: kontact

Kontact stops fetching emails upon internet connection loss and doesn't
recover. The account type is IMAP with SSL. Kontact version is 4.8.5 (not
available in the version list in the bugtracker).

Closing Kontact and opening again doesn't help. It still doesn't fetch emails
and the progress 
indicator (progress bar at the right bottom corner) doesn't show up.

It be seen that an akonadi_imap processe is left ofer:
user 22261  9154  1 Oct24 ?        00:19:25 /usr/bin/akonadi_imap_resource
--identifier akonadi_imap_resource_0

Stracing the process we can see it is in a cycle of

poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN},
{fd=6, events=POLLIN}, {fd=12, events=POLLIN}], 5, -1) = 1 ([{fd=6,
revents=POLLIN}])
read(3, 0xbf812c6c, 16)                 = -1 EAGAIN (Resource temporarily
unavailable)
recv(6,
"j\0\3\1C\0\0\0\1\0\200\2\1\0\0\0\251\255\7\232\251\255\7\232\10\200\273\277z\32\6\10",
4096, 0) = 32
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily
unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily
unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily
unavailable)
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily
unavailable)
clock_gettime(CLOCK_MONOTONIC, {3043019, 547303416}) = 0
recv(6, 0x9276f90, 4096, 0)             = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN},
{fd=6, events=POLLIN}, {fd=12, events=POLLIN}], 5, -1) = 1 ([{fd=6,
revents=POLLIN}])

We can also see with netstat that a connection is still in state ESTABLISHED

tcp        0      0 192.168.1.10:51614      X.Y.W.Z:993        ESTABLISHED
22261/akonadi_imap

Killing the akonadi_imap processes doesn't help: kontact starts up with all the
email folders in red characters (see atachment).

Killing ALL akonadi processes solves the problem as Kontact restarts akonadi.

An end user would have to logout / login again to restart receiving emails.

Conclusion: the akonadi backend does not deal with connections interruptions
and Kontact does not deal with akonadi's misbehaviour.

Reproducible: Always

Steps to Reproduce:
1. open Kontact and fetch mails
2. loose internet connection
3. observe that Kontact is not fetching emails anymore
Actual Results:  
Kontact stopped fetching emails.

Expected Results:  
Kontact should realize the internet connection is available already and restar
working properly.

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