Re: Help with debugging a bug in Konqueror
Stefano Crocco <[email protected]> Mon, 13 Jul 2026 09:39:58 +0200
| Newsgroups | gmane.comp.kde.devel.general |
|---|---|
| Message-ID | <[email protected]> |
This is a multi-part message in MIME format. --nextPartkc5v1fy6QEOLetR1CTZxeA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On luned=C3=AC 13 luglio 2026 08:49:46 Ora legale dell=E2=80=99Europa centr= ale you wrote: > On Mon, 2026-07-13 at 08:41 +0200, Stefano Crocco wrote: > > 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 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 > Are you sure freeze happens in that thread? >=20 > The stacktrace is from the rendering thread. Does Konqueror window get > "grayed out" by KWin when it freezes? If it doesn't I'd think the > freeze happens in another thread. Thanks for the answer. No, the Konqueror window doesn't look grayed out: i= t=20 looks completely normal to the point that often I don't realize it has froz= en=20 until I try to interact with: only at that point I notice that all parts of= =20 the UI don't respond in any way yo mouse or keyboard. If I minimize the=20 window, then restore it, its contents aren't drawn so that it shows the=20 contents of the previously active window. > > 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 > > Thanks in advance > >=20 > > Stefano I attach a new backtrace with all threads (compressed because of size). I=20 still can't see anything related to Konqueror. The only thing I can notice = is=20 a mention of QDBus in thread 67, but I still don't know what information to= =20 get from it. Any other ideas? 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