Re: Help with debugging a bug in Konqueror

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From: Juraj Oravec <[email protected]>
To: [email protected]
Cc: Stefano Crocco <[email protected]>
Subject: Re: Help with debugging a bug in Konqueror
Date: Mon, 13 Jul 2026 23:46:33 +0200
Message-ID: <[email protected]>
In-Reply-To: <[email protected]>
References:  <[email protected]> <[email protected]>
MIME-Version: 1.0

A small update,

I can get both Falkon and Konqueror stuck when opening the combobox on=20
this page:
https://google.github.io/liquidfun/

Best regards,
Juraj

On pondelok 13. j=C3=BAla 2026 23:22:46 stredoeur=C3=B3psky letn=C3=BD =C4=
=8Das Juraj Oravec=20
wrote:
> Hello,
>=20
> > 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.
> >=20
> > 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.
>=20
> 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".
>=20
> 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.
>=20
> 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).
>=20
> > 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.
> >=20
> > 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?
>=20
> 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.
>=20
> > Thanks in advance
> >=20
> > Stefano
>=20
> Best regards,
> Juraj
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