WebEngine display blank window when appimage is run on recent distribution (fix inside) #554

mgautierfr · 2022-09-13T13:19:22Z

The original issue is for the kiwix project with issue : kiwix/kiwix-desktop#810

This issue presents a small repro case and avoid all the kiwix full project : sample_qtwebengine.zip

The program is really simple, it is a QWebEngine with a "Hello, World!" text.

#include <QtGlobal>
#include <QApplication>
#include <QWebEngineView>


int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWebEngineView view;
    view.setHtml("<html><body>Hello, World!</body></html>");
    view.resize(1024, 750);
    view.show();

    return app.exec();
}

The application is packaged with qt515 found in ppa https://launchpad.net/~beineri/+archive/ubuntu/opt-qt-5.15.2-bionic
This is necessary as QtWebEngine is not packaged by Ubuntu bionic and we "need" bionic because of what described in #340

README.txt file explains how to compile the sample program (mostly qmake/make)

Appimage is generated using create_app_image.sh script in the archive. It mostly prepare AppDir, download last linuxdeployqt and run it to create appimage.

When generated AppImage is run on Ubuntu bionic, the webview display "Hello, World!".
When run on recent distribution (Fedora, Ubuntu 20.04, other?), the AppImage launch but webview is empty.
An Appimage generated on a recent distribution (with system qtWebEngine and option -unsupported-allow-new-glibc) works.

I've tried to compare strace log, between a run on Bionic and Fedora 36, but haven't found anything useful (at least for me)
Same when comparing the content of AppImage generated on Bionic and Fedora 36

The text was updated successfully, but these errors were encountered:

caralu74 · 2022-10-01T21:15:31Z

I've got this:
/sample_qtwebengine$ qmake
Info: creating stash file /home/user/sample_qtwebengine/.qmake.stash
user@PC_X:/sample_qtwebengine$ make
g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_QMLMODELS_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -I. -I/usr/include/x86_64-linux-gnu/qt5 -I/usr/include/x86_64-linux-gnu/qt5/QtWebEngineWidgets -I/usr/include/x86_64-linux-gnu/qt5/QtWebEngineCore -I/usr/include/x86_64-linux-gnu/qt5/QtQuick -I/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport -I/usr/include/x86_64-linux-gnu/qt5/QtWidgets -I/usr/include/x86_64-linux-gnu/qt5/QtGui -I/usr/include/x86_64-linux-gnu/qt5/QtQmlModels -I/usr/include/x86_64-linux-gnu/qt5/QtWebChannel -I/usr/include/x86_64-linux-gnu/qt5/QtQml -I/usr/include/x86_64-linux-gnu/qt5/QtNetwork -I/usr/include/x86_64-linux-gnu/qt5/QtPositioning -I/usr/include/x86_64-linux-gnu/qt5/QtCore -I. -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++ -o main.o src/main.cpp
g++ -Wl,-O1 -Wl,-rpath-link,/usr/lib/x86_64-linux-gnu -o sample_qtwebengine main.o /usr/lib/x86_64-linux-gnu/libQt5WebEngineWidgets.so /usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so /usr/lib/x86_64-linux-gnu/libQt5Quick.so /usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so /usr/lib/x86_64-linux-gnu/libQt5Widgets.so /usr/lib/x86_64-linux-gnu/libQt5Gui.so /usr/lib/x86_64-linux-gnu/libQt5QmlModels.so /usr/lib/x86_64-linux-gnu/libQt5WebChannel.so /usr/lib/x86_64-linux-gnu/libQt5Qml.so /usr/lib/x86_64-linux-gnu/libQt5Network.so /usr/lib/x86_64-linux-gnu/libQt5Positioning.so /usr/lib/x86_64-linux-gnu/libQt5Core.so -lGL -lpthread
user@PC_X:~/sample_qtwebengine$ ./sample_qtwebengine

$ ./create_app_image.sh
linuxdeployqt (commit 5fa79fa), build 36 built on 2022-08-21 12:36:03 UTC
ERROR: The host system is too new.
Please run on a system with a glibc version no newer than what comes with the oldest
currently still-supported mainstream distribution (Ubuntu Bionic), which is glibc 2.27.
This is so that the resulting bundle will work on most still-supported Linux distributions.
For more information, please see
#340

probonopd · 2022-10-03T09:39:06Z

When generated AppImage is run on Ubuntu bionic, the webview display "Hello, World!".
When run on recent distribution (Fedora, Ubuntu 20.04, other?), the AppImage launch but webview is empty.

Do you get any errors when launched from the comand line?

unsupported-...

It is unsupported and broken, don't use it.

mgautierfr · 2022-10-04T12:18:51Z

Do you get any errors when launched from the comand line?

Only a warning :
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.

It is unsupported and broken, don't use it.

Yes, it was just to say that a same application generated on a recent platform works. (but I need to use the unsupported option).
The issue is about a appImage generated on a supported platform.

probonopd · 2022-10-04T18:46:27Z

Please try on a system without Wayland. Does it work there?

mgautierfr · 2022-10-05T07:03:35Z

No warning, but same behavior (blank window)

probonopd · 2022-10-05T07:09:17Z

Thanks for testing. Unfortunately I don't know the cause yet. Can you call your AppImage like this:

LD_DEBUG=libs ./YourApp-1.0.1-x86_64.AppImage

Do you see messages like

error: symbol lookup error: undefined symbol: ... (fatal)

or similar?

mgautierfr · 2022-10-05T07:36:51Z

Definitely I have some lookup error :

/tmp/.mount_SampleGmZP0r/usr/libexec/../lib/libQt5WebEngineCore.so.5: error: symbol lookup error: undefined symbol: localtime64 (fatal)
/tmp/.mount_SampleGmZP0r/usr/libexec/../lib/libQt5WebEngineCore.so.5: error: symbol lookup error: undefined symbol: localtime64_r (fatal)
./Sample-0.0.1-x86_64.AppImage: error: symbol lookup error: undefined symbol: nspr_use_zone_allocator (fatal)

Full log is here:
Sample-qtwebengine.log

mgautierfr · 2022-10-19T14:27:41Z

@probonopd Do you have a idea of what could be the problem here ?
(apart that localtime64 is missing)

probonopd · 2022-10-19T18:02:07Z

Don't know (yet). More debugging is needed. Unfortunately I don't have the time to dive into this right now.

mishafuod-13 · 2022-10-20T16:59:26Z

@mgautierfr I faced a similar problem, but somehow I managed to overcome it by adding a couple of lines to main ():

qputenv("QTWEBENGINE_CHROMIUM_FLAGS", "--disable-gpu --no-sandbox") ; QApplication::setAttribute(Qt::AA_UseOpenGLES);

Errors like the one you posted in this post, in my case, they appeared on different versions of Qt and did not play any role in rendering the web page.

mishafuod-13 · 2022-10-20T20:17:57Z

@mgautierfr I tested the built Appimage (from your project 'sample_qtwebengine') with the options that I specified above on Fedora 35 (built on Ubuntu 18.04) - the render appeared.

kelson42 · 2022-10-21T06:14:33Z

@mishafuod-13 Seems to be a really valuable input of you. Thank you very much.

mishafuod-13 · 2022-10-22T11:38:34Z

@kelson42 Glad if I could help :)

mgautierfr · 2022-11-22T15:31:01Z

@mishafuod-13 I confirm the workaround. Thanks a lot !

caralu74 · 2023-01-03T21:53:31Z

And for me is working fine. Good job, thanks!

martinrotter · 2023-01-19T07:11:33Z

I confirm the workaround to work. Thank you!

darealshinji · 2023-04-27T18:05:03Z

I have the same issues when I try to bundle notepadqq. The mentioned workaround however doesn't do anything here.
Build system is Ubuntu 20.04, host system is Ubuntu 23.04 (qtwebengine not being installed).

Update: nevermind, after a system reboot it seems to work now.

SevenBlocks · 2023-10-13T17:06:15Z

I have the same issue building on Ubuntu 20.04 with Qt 6.6.0 and the above workaround does not help. The webviewer works when executing the binary with the Qt libs in the LD_LIBRARY_PATH, but it shows a blank screen when running the appimage created by linuxdeployqt, so I suspect linuxdeployqt is not including all the necessary libs. Possibly relevant terminal output:
[1013/095916.194515:FATAL:v8_initializer.cc(516)] Error loading V8 startup snapshot file

SOLVED: linuxdeployqt was not copying .../Qt/6.6.0/gcc_64/resources/v8_context_snapshot.bin. Manually copying over this file solved my problem.

probonopd · 2023-10-28T11:20:58Z

So on Qt6 we need to also deploy resources/v8_context_snapshot.bin whenever WebEngine gets deployed?

mgautierfr mentioned this issue Sep 13, 2022

kiwix-desktop appimage webengine is broken on Fedora (and ubuntu 22.04) kiwix/kiwix-desktop#810

Closed

darealshinji mentioned this issue Apr 27, 2023

QtWebEngine settings for AppImage builds notepadqq/notepadqq#1087

Closed

probonopd changed the title ~~WebEngine display blank window when appimage is run on recent distribution.~~ WebEngine display blank window when appimage is run on recent distribution (fix inside) Oct 28, 2023

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

WebEngine display blank window when appimage is run on recent distribution (fix inside) #554

WebEngine display blank window when appimage is run on recent distribution (fix inside) #554

mgautierfr commented Sep 13, 2022

caralu74 commented Oct 1, 2022

probonopd commented Oct 3, 2022

mgautierfr commented Oct 4, 2022

probonopd commented Oct 4, 2022

mgautierfr commented Oct 5, 2022

probonopd commented Oct 5, 2022

mgautierfr commented Oct 5, 2022

mgautierfr commented Oct 19, 2022

probonopd commented Oct 19, 2022

mishafuod-13 commented Oct 20, 2022 •

edited

mishafuod-13 commented Oct 20, 2022 •

edited

kelson42 commented Oct 21, 2022

mishafuod-13 commented Oct 22, 2022

mgautierfr commented Nov 22, 2022

caralu74 commented Jan 3, 2023

martinrotter commented Jan 19, 2023

darealshinji commented Apr 27, 2023 •

edited

SevenBlocks commented Oct 13, 2023 •

edited

probonopd commented Oct 28, 2023

WebEngine display blank window when appimage is run on recent distribution (fix inside) #554

WebEngine display blank window when appimage is run on recent distribution (fix inside) #554

Comments

mgautierfr commented Sep 13, 2022

caralu74 commented Oct 1, 2022

probonopd commented Oct 3, 2022

mgautierfr commented Oct 4, 2022

probonopd commented Oct 4, 2022

mgautierfr commented Oct 5, 2022

probonopd commented Oct 5, 2022

mgautierfr commented Oct 5, 2022

mgautierfr commented Oct 19, 2022

probonopd commented Oct 19, 2022

mishafuod-13 commented Oct 20, 2022 • edited

mishafuod-13 commented Oct 20, 2022 • edited

kelson42 commented Oct 21, 2022

mishafuod-13 commented Oct 22, 2022

mgautierfr commented Nov 22, 2022

caralu74 commented Jan 3, 2023

martinrotter commented Jan 19, 2023

darealshinji commented Apr 27, 2023 • edited

SevenBlocks commented Oct 13, 2023 • edited

probonopd commented Oct 28, 2023

mishafuod-13 commented Oct 20, 2022 •

edited

mishafuod-13 commented Oct 20, 2022 •

edited

darealshinji commented Apr 27, 2023 •

edited

SevenBlocks commented Oct 13, 2023 •

edited