[okular] [Bug 403643] Okular stops rendering PDF and uses up 100% cpu (possible regression)

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=403643

--- Comment #18 from Albert Astals Cid <aacid at kde.org> ---
(In reply to Tobias Deiminger from comment #17)
> (In reply to Postix from comment #10)
> > There are also a few lines with
> > > generatePixmap
> 
> Qt has a shortcut for QTimer::singleShot(msec = 0, ...), where they call
> QMetaObject::invokeMethodImpl to trigger your lambda immediately via a
> QueuedConnection plus one iteration through the event loop.
> 
> So a callstack like yours
> #n+1 QMetaObject::invokeMethodImpl
> #n   Okular::Generator::generatePixmap
> ...
> #n-m QCoreApplicationPrivate::sendPostedEvents
> could indeed stem from a "text generation already finished but
> mTextPageReady still false" endless loop, assuming the compiler has inlined
> some calls for optimization. Note the "could", I see no definite proof yet.
> 
> I generally agree with Albert that this issue is particularly hard to debug
> without being able to reproduce it locally.

The timer is not the problem, that timer gets triggered quite easily and
doesn't infinite loop.

The problem is that sometimes it seems to infinite loop, so yeah, no idea :D

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