Details
-
Bug
-
Resolution: Unresolved
-
P2: Important
-
None
-
5.6.2
-
None
-
Linux
-
Linux/X11
Description
Kindly provide thoughts on our fix or suggest an alternative better fix. Refer:
attached git-commit-diff.txt
NOTE: I have set the priority to P0: Blocker since our product release is blocked because of this bug.
For the following two members defined in qtbase/src/gui/kernel/qplatformintegrationfactory.cpp
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
(QPlatformIntegrationFactoryInterface_iid, QLatin1String("/platforms"), Qt::CaseInsensitive))
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, directLoader,
(QPlatformIntegrationFactoryInterface_iid, QLatin1String(""), Qt::CaseInsensitive))
Destruction on application exit shows segfault error 14 in linux dmesg for these two members.
On converting these static global members to static class members of QPlatformIntegrationFactory removes the segfault.
Refer to attached git-commit-diff.txt for the changes.
OS: Ubuntu 16.04.3 LTS 64 bit
Build Flags:
../configure -release -commercial \ -opengl desktop \ -nomake examples \ -nomake tests \ -confirm-license \ -platform linux-clang-libc++ \ -v \ -I /usr/local/include \ -L /usr/local/lib \ -force-debug-info \ -separate-debug-info \ -skip qtandroidextras \ -skip qtdoc \ -skip qtmacextras \ -skip qtmultimedia \ -skip qtsensors \ -skip qtserialport \ -skip qtwayland \ -skip qtwebsockets \ -skip qtwinextras \ -skip qtx11extras \ -skip qtconnectivity \ -skip qt3d \ -skip qtcanvas3d \ -skip qtsvg \ -skip qtactiveqt \ -skip qtquickcontrols2 \ -skip qtserialbus \ -qt-freetype \ -qt-libjpeg \ -qt-libpng \ -qt-xcb \ -skip enginio \ -skip webengine \ -skip qtactiveqt
Starting point of this whole issue is the following call in our code.
static int argc = 1; static char* argv[] = { "com.xxx.xxxxxx:Plugin" }; QGuiApplication* g_app = new QGuiApplication(argc, argv);
If we remove this call, there is no segfault. Analyzing stack track on segfault with gdb led to the above 2 members.
Compiler used: clang-3.7
$ clang-3.7 --version Ubuntu clang version 3.7.1-2ubuntu2 (tags/RELEASE_371/final) (based on LLVM 3.7.1) Target: x86_64-pc-linux-gnu Thread model: posix