[Bug 215944] Kmail crash while concurrently copying and creating IMAP folders

[Bjarne Juul Pasgaard]

https://bugs.kde.org/show_bug.cgi?id=215944





--- Comment #4 from Bjarne Juul Pasgaard <kdebjp gmail com>  2009-12-03 22:23:51 ---
First, I should correct my previous report. What I did was (concurrently):
1) I was creating folders on one IMAP account.
2) Copying content from folder another IMAP account to the folders created
under bullet 1.
3) Deleting content from the folders copied from.
4) Deleting folders copied from.

I've now tried to reproduce the problem with some test accounts on my mail
server and an old laptop. Fortunately (!), I was able to reproduce the crash -
albeit without any stackdump showing up. I also noticed the following:

1) In one case, copying a large number of mails from a local folder to an IMAP
folder made kmail void all mails (no subject, sending unknown) after which the
IMAP server refused to append the mails to the destination folder. After this,
it was no longer possible to read the mails.
2) While the background copy/move operations are ongoing, switching the display
from one mail folder to another is sometimes extremely slow to respond. Could
be related to how my dovecot mail server responds.
3) In some cases, the display seemed to be totally unresponsive (though the
progress bar was rolling). In this situation it was still possible to select
and display local folders or folders on another IMAP account. Whenever I
selected a folder from the IMAP account that was hanging, the display appeared
unresponsive again. Could be related to how my dovecot mail server responds.

What I did to reproduce the crash was:
1) I have two IMAP accounts; tester1 and tester2 with the following folder
structure: tester1/inbox, tester1/folder1, tester1/folderA, tester1/Deleted
Messages, tester2/inbox, tester2/folder2, tester2/folderB, tester2/Deleted
Messages
2) kmail is configured to use tester1/Deleted Messages and tester2/Deleted
Messages as trash folders for tester1 and tester2, respectively.
3) Initially tester1/folder1 was empty, tester1/folderA and tester2/folderB
contained only a few emails, and tester2/folder2 contained a large number of
emails.
4) I started to move all mails from tester2/folder2 to tester1/folder1.
5) Once this operation was started I switched to view tester2/folderB
6) The folder contents didn't display even after waiting a bit, so I created
tester2/folderC and tester1/folderD.
7) I switched back and forth between tester1/folderD, tester2/folderC, and
tester2/folderB, but none of the folders were able to display their contents
(as far as I recall).
8) I then settled to wait for the contents of tester2/folderB to display. Once
displayed, I started to delete contents. I think I also subsequently tried to
view the contents of test2/folderC, but somewhere around this point, kmail
crashed.
9) When I started up kmail again, there were still mails in tester2/folder2
that hadn't been moved to tester1/folder1.

I know I ought to try to reproduce the problem once more in order to eliminate
all the uncertainties in my description, but I don't have much more time right
now. So, I hope the above gives you enough information to get a better idea of
where the problem is located. Otherwise, please say so, and I'll try to
allocate some more time later.

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