Re: GUI file dialog freeze

[Torsten]

On 24.05.2013 21:12, Daniel J Sebald wrote:
> On 05/24/2013 12:25 PM, Torsten wrote:
>> On 21.05.2013 11:18, Thorsten Liebig wrote:
>>> I have a strange problem with the Octave GUI on Kubuntu 13.04 and it
>>> already existed on Kubuntu 12.10
>>>
>>> If I want to open or save a file, the file dialog and Octave freezes.
>>> At the same time I get this message in the Octave terminal:
>>> "KGlobal::locale(): Warning your global KLocale is being recreated
>>> with a valid main component instead of a fake component, this usually
>>> means you
>>> tried to call i18n related functions before your main component was
>>> created. You should not do that since it most likely will not work"
>>> But this seems not necessarily related to the freeze (see below)
>>>
>>> If I wait a couple of minutes, I get on the Octave terminal:
>>> QProcess: Destroyed while process is still running.
>>> QProcess: Destroyed while process is still running.
>>>
>>> After this two messages, I can browse the files normally and open/save.
>>>
>>> But this two processes that got killed seem to be important, because
>>> after this Octave behaves strange...
>>> E.g.: Sometimes the entire GUI freezes or at least doesn't get
>>> updated if a script is running...
>>> If I'm patient again, I get again:
>>> "QProcess: Destroyed while process is still running."
>>> And the GUI unfreezes again...
>>>
>>> I tried a fresh Kubuntu 13.04 on a virtual machine and did *not* see
>>> this problems, except the "KGlobal::locale()..." message, but no
>>> freezes... :(
>>> And to make this even more weird. I have been seeing this problem on
>>> my machine at work for a long time (>half a year) but had no time to
>>> look closer,
>>> but recently my home machine got infected as well :(
>>>
>>> I have no idea how to debug this problem or what is causing it...
>>>
>>> Does anybody else have this issues?
>>> Any ideas?
>>
>> We have already got a bug report some time ago
>> (https://savannah.gnu.org/bugs/index.php?38305) but without a response
>> to our requests for more info. Therefore it was closed.
>>
>> Here the three related questions from Rik and me:
>> - What language is configured in the settings dialog? Does the freeze
>> occur with en_US, too?
>> - Does the settings dialog cause this freeze, too?
>> - Does Octave actually crash, as in a segmentation fault and a return to
>> the shell prompt? Or is the first File Dialog window slow to open, but
>> subsequent dialogs are fine?
>>
>> Torsten
> 
> Here's a discussion on this type of error, which seems to be KDE-related
> (Qt tries to use native desktop features):
> 
> http://qt-project.org/forums/viewthread/7159
> 
> The problem probably lies somewhere with Qt and it's use of KDE, but
> perhaps is triggered in the app by using some type of static variable or
> object in some way as an input.  I haven't look in too much depth to
> know exactly what it is.
> 
> Dan

I reopened the bug and suggest to continue the discussion via the bug
tracker.

Torsten