Re: Help with debugging a bug in Konqueror

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From: Juraj Oravec <[email protected]>
To: [email protected]
Subject: Re: Help with debugging a bug in Konqueror
Date: Tue, 14 Jul 2026 09:25:45 +0200
Message-ID: <[email protected]>
In-Reply-To: <[email protected]>
MIME-Version: 1.0

On utorok 14. j=C3=BAla 2026 9:15:27 stredoeur=C3=B3psky letn=C3=BD =C4=8Da=
s Stefano Crocco=20
wrote:
> On luned=C3=AC 13 luglio 2026 23:46:33 Ora legale dell=E2=80=99Europa cen=
trale
> Juraj Oravec
> wrote:
> > A small update,
> >=20
> > I can get both Falkon and Konqueror stuck when opening the combobox
> > on this page:
> > https://google.github.io/liquidfun/
> >=20
> > Best regards,
> > Juraj
> >=20
> > 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
> Thanks for this information. I tried the link you provided and indeed,
> I got a freeze. However, as you said, this freezes the whole desktop,
> while in the other cases (luckily) I always experienced a freeze of
> Konqueror only. The two backtraces look very similar, however, except
> for the beginning. I attach the relative backtrace.
>=20
> Do you get the freeze every time on the page you mentioned? I only got
> it on my desktop machine, which is also the machine where I got the
> other freezes. When I tried with my laptop, the page worked correctly
> (I'm not using the laptop much these days so I can't say whether
> Konqueror freezes on it too).

The freeze happens "always" and at "random".
In the handful of times I tried it, I always managed to get the freeze,=20
but in order to get the freeze I tried to change the running animation=20
through the select box multiple times. It took variable number of=20
attempts to get the freeze.

> My desktop system as ha AMD Radeon RX 6700 XT graphic card: I've had
> it for several years and it has always worked flawlessly, so I think
> that if the cause is related to the driver, it's something new.

Than, I would scratch that the specific GPU is an issue.

> Given that Falkon is also showing this issue, I think the cause is not
> Konqueror itself but something else. I think I've found out when this
> issue started happening for me: between the last days of May and the
> first days of June. As soon as I have time, I'll try to look at the
> log of the packages I updated in those days to see  if there's
> something which could be related to this.
>=20
> Stefano

Thank you for looking into this,
Best regards, Juraj.
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