Random crash in QueryMaker::newResultReady()

[Mark Kretschmann]

On Sun, Dec 27, 2009 at 7:56 AM, Mark Kretschmann <kretschmann at kde.org> wrote:
> On Sun, Dec 27, 2009 at 1:16 AM, Alex Merry <kde at randomguy3.me.uk> wrote:
>> I had a lot of locking crashes the other week, including this one, I think.
>> Most of them were in libdbus, though.  It appeared to go away last time I
>> updated my KDE (trunk) build, though (I didn't update Qt).
>
> FWIW, I just found out that this crash seems to happen with several Qt
> versions (myself I used 4.5.3) and KDE versions, and we even got a
> "release_blocker" bug report for it, so it seems to be rather common:
>
> https://bugs.kde.org/show_bug.cgi?id=215684

Looking at the backtrace again, I wouldn't be surprised if were
dealing with some kind of dangling pointer here. The QMutex call might
be a red herring.

What might actually happen is that the handleResult() or
newResultReady() SLOTs are called on an object that was already
destroyed, I think. Sadly Qt does not automatically remove connections
to destroyed objects.

-- 
Mark Kretschmann
Amarok Developer
Fellow of the Free Software Foundation Europe
www.kde.org - amarok.kde.org - www.fsfe.org