Help with debugging a bug in Konqueror

[Juraj Oravec]

Hello,

> Hello to everyone,
> for the last few weeks, I've randomly encountered what I assume is a
> bug in Konqueror: I'd like to fix it, because it's rather annoying,
> but I don't know how to debug it to find its cause.
> 
> The issue is that sometimes Konqueror completely freezes: none of its
> windows respond to mouse or keyboard. The only way to go on is to
> kill it. It's not a frequent issue: it usually happens once a day or
> so. Once it has happened, however, it's likely to happen again in a
> short time.

I run experiencing similar issue with Falkon, where Falkon freezes the 
whole desktop when I try to open a combobox (<select>) on a website.
It also happens randomly and everything is fine after I ssh into the 
machine and kill Falkon. I did not look into debugging this issue yet as 
I attributed it to "has to be external thing".

I am running i3 + picom on top of XOrg. If you are running something 
else, it could explain the difference on what freezes. After Falkon dies 
system is fully responsive again.

I attributed it to Qt or Intel drivers (I have Intel B580 gpu), as they 
are not perfect yet (the HW video acceleration likes to crash once in a 
while).

> I attach a backtrace by attaching gdb to the Konqueror instance once
> the freeze happens. As you can see, it contains almost nothing from
> Konqueror itself: just two calls near the bottom, the last of which
> is a call to QApplication::exec(). All other function calls are
> either inside KDE Frameworks or Qt: I'd almost think this is not a
> problem with Konqueror if it were not for the fact that I'm only
> experiencing the issue with Konqueror.
> 
> Given the randomness of the freezes and the fact that the backtrace
> contains almost no Konqueror-specific calls, I really have no ideas
> on how to proceed to debug the issue, and I really don't even know
> what to search on the web. Do you have any advice?

It is totally random for me as well, so far I did not bother 
investigating as these issues often solve themselves with time.
Plus I run Artix with often older packages (I update once in a while), 
so getting debug symbols for whole system is not possible.

> Thanks in advance
> 
> Stefano

Best regards,
Juraj
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