Looks like the SIGNAL loadFinished(bool) is not emitted anymore with Qt 6.8.1

JonB

@Volker75
Yes, I have used valgrind many times. Yes, it can be a useful tool. Yes, it can always return false positives. No, I don't think anyone particularly will look into this, especially with QWebEngine, unless some behaviour is demonstrably wrong. Which as I understand it you do not have. You still say "why the function doesn't do what it should do" but I haven't seen a consistent report of something going wrong, else the other guys would have said so, valgrind report apart. Maybe I'm mistaken and someone else will look into this, but I wouldn't hold your breath.

Volker75

In my source it crashes every time under Linux 6.8.1!
Sadly it is large and so you want to have a smaller file of course, but then he bug doesn't occur.
It is like if I use a Qt function like this:
qt_foo(myCode.size());

And in this Qt function is source like this: (This is not the real source. Only a bad example):
a[10];
...
for(int i=0; i<x; i++)
sum+=a[i];
}

and you tell me: "Ohh... Wait: Your example code is too large. You must do a smaller sample code and prove that it doesn't work. Nobody will check such a large example. Your sample code is only allowed to have a small example that doesn't work."
My source code is sadly large. I can't make my source code smaller. If I make my source code smaller, then it is just higher luck that the bug doesn't occur.

Volker75

I pay 50€ to the guy that fix this bug.

JonB

@Volker75
This forum is a user from, for users of Qt just like yourself. It is not a The Qt Company forum. If you want to report a bug that is done at TQtC https://bugreports.qt.io/. I think you will find they want a small program which reproduces bad behaviour. I don't know that they will look at your larger existing application, but up to you.

In my source it crashes every time under Linux 6.8.1!

I agree that is problematic. You might supply them with the stack trace on crash, which you have not shown us.

I pay 50€ to the guy that fix this bug.

LOL :)

Volker75

Well, I am not the only one that will be thankful is this bug will be fixed. If every Qt webengine users spent only 1€, it will be pretty much.
I am only a math and physic teacher that codes in his spare time. I am not a professional coder.

Volker75

Maybe am am not skilled enough with gdb.
I used gdb and used "r". And tried to get the crash.
Then I get this error:

Thread 1 "Test" received signal SIGSEGV, Segmentation fault.
Downloading source file /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp
QWebEngineView::page (this=0x555556a22710) at /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp:1058                                                                    
Warnung: 1058   /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp: Datei oder Verzeichnis nicht gefunden

It is translated: File or Folder not found
So similar to the bug that i descriped in the other topic that i linked a few posts ago.

Please give me more advice what I can do to locate the bug.

Volker75

Sorry, I forgot the bt stuff. I hope anyone understand it:

[Thread 0x7fff7cc006c0 (LWP 13329) exited]

Thread 1 "Test" received signal SIGSEGV, Segmentation fault.
Downloading source file /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp
QWebEngineView::page (this=0x555556a22710) at /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp:1058                                                                    
Warnung: 1058   /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp: Datei oder Verzeichnis nicht gefunden
(gdb) bt
#0  QWebEngineView::page (this=0x555556a22710) at /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp:1058
#1  0x00007ffff7f50f26 in QWebEngineView::setHtml (this=<optimized out>, html=<Fehler beim Lesen der Variable: Cannot access memory at address 0x7fffffffc038>, baseUrl=...)
    at /home/qt/work/qt/qtwebengine/src/webenginewidgets/api/qwebengineview.cpp:1102
#2  0x0000555555ae0436 in operator() (__closure=0x555556a59390) at src/timetableprintform.cpp:58
#3  0x0000555555ae0ced in operator() (__closure=0x7fffffffc120) at ../../../Qt6.8/6.8.1/gcc_64/include/QtCore/qobjectdefs_impl.h:141
#4  0x0000555555ae0d94 in QtPrivate::FunctorCallBase::call_internal<void, QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, TimetablePrintForm::TimetablePrintForm(QWidget*)::<lambda()> >::call(TimetablePrintForm::TimetablePrintForm(QWidget*)::<lambda()>&, void**)::<lambda()> >(void **, struct {...} &&) (args=0x7fffffffc258, fn=...)
    at ../../../Qt6.8/6.8.1/gcc_64/include/QtCore/qobjectdefs_impl.h:65
Backtrace stopped: Cannot access memory at address 0x7fffffffc108

Volker75

In timetableprintform.cpp line 58 is the source from ChrisW67. It is:

view->setHtml("<html><head><title>Three seconds page</title></head><body><p>New content</p></body></html>");

hskoglund

What distro of Linux are you using?

Volker75

Kubuntu 24.04: Just to be clear: the backtrack is if i copy his code into my project and run it.