[kmail2] [Bug 463861] New: kmail stopped showing messages

[Parameshwara Bhat]

https://bugs.kde.org/show_bug.cgi?id=463861

            Bug ID: 463861
           Summary: kmail stopped showing messages
    Classification: Applications
           Product: kmail2
           Version: 5.22.0
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: peebhat at gmail.com
  Target Milestone: ---

SUMMARY
***
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Kmail is not showing any messages in 'unified mailboxes' or 'Local Folders'.

I can see mail files intact in '/home/me/.local/share/local-mail' folder. I can
also see my identity and receiving and sending accounts intact and unchanged,
except, in receiving accounts other than 'local folder' and
'maildir_resource_x' folder I can see 'offline' tag appearing.

I was trying to migrate kmail on another laptop. I was not able to receive,but
was able to send messages. On the laptop where this problem happened now,kmail
was correctly working. I decided to compare settings across the laptops. So, I
went to 'settings > receiving accounts' where I received mails from four  mail
accounts and all of which were working.

Among the receiving accounts were listings for 'akonadi_maildir_resource_2' and
'Local folders'. These two were not what I created, but kmail put them there at
some point of time.

Now I selected each of them one after the other, clicked on 'modify' , and was
reading the entries in the dialog that came up. I did not intend to change and
I did not change. I was reading the entries. The dialog was open and in
dolphin, I was navigating in the folders under 
'/home/me/.local/share/local-mail'. I saw a starnge message popping up and
saying(to the effect), 'the folder you just deleted contained messages......'
Suddenly I saw 'unified mailboxes' and 'local folder' content disppearing and
coming back and then the content disappeared for good. 
Now, once in a while, I see a notification flashing, ' Error while trying to
get the local inbox folder, aborting mail check.Timeout trying to get lock. '

I have earlier experience of kmail not showing any message listing  and then I
closed kmail, in the terminal manually stopped akonadi server and restarted
kmail. Messages all reappeared. Several times it has happened.Messages have
re-appeared too. I have browsed through settings many times before, tinkered
with them and got them to work. This never happened.

I tried the same steps in this case and re-booted the system, but messages do
not list. As I said before, I can see message files in local-mail folders.



STEPS TO REPRODUCE
1. Fully described in summary
2. This may or may not happen to others.It is sudden and completely magical and
even I cannot trust what happened. I was just browsing the settings and the
dialog was still open when the messages disappeared.
3. If and when I get the messages back, I can retry browsing through the
settings and see if this issue repeats.
Now I cannot say,this is a reproducible bug. This occurrence is too hard to
believe.

OBSERVED RESULT


EXPECTED RESULT
I want to get the messages back.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Manjaro
(available in About System)
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.101.0
Qt Version: Version 5.15.7 (built against 5.15.7)

ADDITIONAL INFORMATION

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