Details
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Bug
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Resolution: Out of scope
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P2: Important
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None
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6.4.0, 6.4.1
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None
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fresh & up to date Ubuntu 22.04, fully able to build Qt5 and Qt6.x useable with my big projects
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Linux/Wayland
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21
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Foundation PM Staging
Description
Background: I'm currently testing a green-field 400kLOC project with ASAN and TSAN (in the future with MSAN).
There is some sort of simple communication server holding all my stuff together which is based on Qt and this server is giving me some TSAN warnings from Qt code – I've compiled all relevant third parties which Qt is using and Qt and my server itself with TSAN (in my case only GLib and DBus) to get rid of false-positives.
Later i will try to ASAN/TSAN test a very organic grown Qt5→Qt6 port of a ~1Mio LOC project and hope to get rid of the most basic ASAN/TSAN findings before – at least with Qt dev branch so the next upcoming releases are cleaner for my testing.
Currently a simple QApplication program throws a good amount of TSAN warnings on start/exit and I've got some other simple Qt unit-tests that contains more warnings.
My build instructions:
mkdir ~/qt6_dev
1. build Glib with TSAN
cd ~/qt6_dev
git clone https://gitlab.gnome.org/GNOME/glib.git
cd glib
git checkout 2.72.1
cd ..
mkdir glib-build
cd glib-build
meson setup ../glib -Dbuildtype=debug -Db_sanitize=thread --prefix
~/qt6_dev/glib-install
meson compile
meson install
2. build DBus with TSAN (using TSAN-Glib)
git clone https://github.com/freedesktop/dbus.git cd dbus git checkout dbus-1.12.20 cd .. mkdir dbus-build cd dbus-build PKG_CONFIG_PATH=~/qt6_dev/glib-install/lib/x86_64-linux-gnu/pkgconfig cmake ../dbus/cmake -DCMAKE_INSTALL_PREFIX=~/qt6_dev/dbus-install -DCMAKE_CXX_FLAGS="-g -fno-omit-frame-pointer -fsanitize=thread" -DCMAKE_C_FLAGS="-g -fno-omit-frame-pointer -fsanitize=thread" -DCMAKE_EXE_LINKER_FLAGS="-fno-omit-frame-pointer -fsanitize=thread" -DCMAKE_MODULE_LINKER_FLAGS="-fno-omit-frame-pointer -fsanitize=thread" cmake --build . --parallel 6 cmake --install .
3. build Qt 6.4(with patch:
https://codereview.qt-project.org/c/qt/qtbase/+/442720 – my first ASAN finding) with TSAN
cd ~/qt6_dev
git clone git://code.qt.io/qt/qt5.git qt6
cd qt6
perl init-repository
git checkout v6.4.0
# apply patch
cd ..
mkdir qt6-build
cd qt6-build
PKG_CONFIG_PATH=~/qt6_dev/glib-install/lib/x86_64-linux-gnu/pkgconfig:~/qt6_dev/dbus-install/lib/pkgconfig
../qt6/qtbase/configure -debug -opensource -nomake examples -nomake
tests -sanitize thread -prefix ~/qt6_dev/qt6-install
cmake --build . --parallel 6
cmake --install .
problem: qt6 cmake ignores for unknown reasons my TSAN dbus lib so we later use LD_LIBRARY_PATH to force TSAN dbus lib loading (see QTBUG-108783).
4. build simple example qt_tsan_tests with TSAN
int main( int argc, char* argv[] ) { QApplication app( argc, argv ); QWidget window; window.resize( 320, 240 ); window.show(); return app.exec(); }
5. start example with
LD_LIBRARY_PATH=~/qt6_dev/dbus-install/lib:$LD_LIBRARY_PATH ./qt_tsan_tests
see attached TSAN warnings.
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