Segmentation fault (core dumped)

Samed Sucuk

I am trying to execute my builded project. But i have taken Segmentation Fault (Core Dumped). I'am using Arch Linux and i3.

This is my journalctl record:

systemd-coredump[43851]: [🡕] Process 43832 (SpeedMeterApp) of user 1000 dumped core.

                                               Stack trace of thread 43832:
                                               #0  0x0000779c99b32b1f _ZN18QWidgetTextControl14setCursorWidthEi (libQt6Widgets.so.6 + 0x332b1f)
                                               #1  0x0000779c99b277a4 _ZN18QWidgetTextControlC1EP7QObject (libQt6Widgets.so.6 + 0x3277a4)
                                               #2  0x0000779c99c7703c n/a (libQt6Widgets.so.6 + 0x47703c)
                                               #3  0x0000779c99c777b1 _ZNK17QGraphicsTextItem8documentEv (libQt6Widgets.so.6 + 0x4777b1)
                                               #4  0x0000779c9a0d8432 n/a (libQt6Charts.so.6 + 0xd8432)
                                               #5  0x0000779c9a0d9b00 _ZNK17ChartThemeManager13decorateChartEP6QChartP10ChartTheme (libQt6Charts.so.6 + 0xd9b00)
                                               #6  0x0000779c9a0da6ed _ZN17ChartThemeManager8setThemeEN6QChart10ChartThemeE (libQt6Charts.so.6 + 0xda6ed)
                                               #7  0x0000779c9a10103c _ZN13QChartPrivate4initEv (libQt6Charts.so.6 + 0x10103c)
                                               #8  0x0000779ca015c5d9 _ZN16DeclarativeChart9initChartEN6QChart9ChartTypeE (libQt6ChartsQml.so.6 + 0x2d5d9)
                                               #9  0x0000779ca017546a n/a (libQt6ChartsQml.so.6 + 0x4646a)
                                               #10 0x0000779ca6310ef2 _ZNK8QQmlType6createEPPvm (libQt6Qml.so.6 + 0x310ef2)
                                               #11 0x0000779ca6310ff2 _ZNK8QQmlType18createWithQQmlDataEv (libQt6Qml.so.6 + 0x310ff2)
                                               #12 0x0000779ca62dafff _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dafff)
                                               #13 0x0000779ca62ded34 n/a (libQt6Qml.so.6 + 0x2ded34)
                                               #14 0x0000779ca62dae85 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dae85)
                                               #15 0x0000779ca62dc7c4 _ZN17QQmlObjectCreator18setPropertyBindingEPK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2dc7c4)
                                               #16 0x0000779ca62d4ece _ZN17QQmlObjectCreator13setupBindingsE6QFlagsINS_11BindingModeEE (libQt6Qml.so.6 + 0x2d4ece)
                                               #17 0x0000779ca62d8f8b _ZN17QQmlObjectCreator16populateInstanceEiP7QObjectS1_PK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2d8f8b)
                                               #18 0x0000779ca62dabb6 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dabb6)
                                               #19 0x0000779ca62ded34 n/a (libQt6Qml.so.6 + 0x2ded34)
                                               #20 0x0000779ca62dae85 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dae85)
                                               #21 0x0000779ca62dc7c4 _ZN17QQmlObjectCreator18setPropertyBindingEPK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2dc7c4)
                                               #22 0x0000779ca62d4ece _ZN17QQmlObjectCreator13setupBindingsE6QFlagsINS_11BindingModeEE (libQt6Qml.so.6 + 0x2d4ece)
                                               #23 0x0000779ca62d8f8b _ZN17QQmlObjectCreator16populateInstanceEiP7QObjectS1_PK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2d8f8b)
                                               #24 0x0000779ca62dabb6 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dabb6)
                                               #25 0x0000779ca62ded34 n/a (libQt6Qml.so.6 + 0x2ded34)
                                               #26 0x0000779ca62dae85 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dae85)
                                               #27 0x0000779ca62dc7c4 _ZN17QQmlObjectCreator18setPropertyBindingEPK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2dc7c4)
                                               #28 0x0000779ca62d4ece _ZN17QQmlObjectCreator13setupBindingsE6QFlagsINS_11BindingModeEE (libQt6Qml.so.6 + 0x2d4ece)
                                               #29 0x0000779ca62d8f8b _ZN17QQmlObjectCreator16populateInstanceEiP7QObjectS1_PK16QQmlPropertyDataPKN3QV412CompiledData7BindingE (libQt6Qml.so.6 + 0x2d8f8b)
                                               #30 0x0000779ca62dabb6 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dabb6)
                                               #31 0x0000779ca62ded34 n/a (libQt6Qml.so.6 + 0x2ded34)
                                               #32 0x0000779ca62dae85 _ZN17QQmlObjectCreator14createInstanceEiP7QObjectb (libQt6Qml.so.6 + 0x2dae85)
                                               #33 0x0000779ca62ded34 n/a (libQt6Qml.so.6 + 0x2ded34)
                                               #34 0x0000779ca625d838 _ZN20QQmlComponentPrivate11beginCreateE14QQmlRefPointerI15QQmlContextDataE (libQt6Qml.so.6 + 0x25d838)
                                               #35 0x0000779ca625479b _ZN20QQmlComponentPrivate13doBeginCreateEP13QQmlComponentP11QQmlContext (libQt6Qml.so.6 + 0x25479b)
                                               #36 0x0000779ca625857f _ZN20QQmlComponentPrivate20createWithPropertiesEP7QObjectRK4QMapI7QString8QVariantEP11QQmlContextNS_14CreateBehaviorE (libQt6Qml.so.6 + 0x25857f)
                                               #37 0x0000779ca623abe0 _ZN28QQmlApplicationEnginePrivate10finishLoadEP13QQmlComponent (libQt6Qml.so.6 + 0x23abe0)
                                               #38 0x0000779ca623c2c7 _ZN21QQmlApplicationEngine4loadERK4QUrl (libQt6Qml.so.6 + 0x23c2c7)
                                               #39 0x0000558120783595 n/a (/home/amore/Projects/qtProject/SpeedMeter2/build7/SpeedMeterApp + 0x17595)
                                               #40 0x0000779ca5243cd0 n/a (libc.so.6 + 0x25cd0)
                                               #41 0x0000779ca5243d8a __libc_start_main (libc.so.6 + 0x25d8a)
                                               #42 0x00005581207850a5 n/a (/home/amore/Projects/qtProject/SpeedMeter2/build7/SpeedMeterApp + 0x190a5)
                                               ELF object binary architecture: AMD x86-64

CMakeLists.txt:

cmake_minimum_required(VERSION 3.21.1)

option(LINK_INSIGHT "Link Qt Insight Tracker library" ON)
option(BUILD_QDS_COMPONENTS "Build design studio components" ON)

project(SpeedMeterApp LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(QT_QML_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/qml)
set(QML_IMPORT_PATH ${QT_QML_OUTPUT_DIRECTORY}
    CACHE STRING "Import paths for Qt Creator's code model"
    FORCE
)

find_package(Qt6 6.2 REQUIRED COMPONENTS Core Gui Qml Quick)

if (Qt6_VERSION VERSION_GREATER_EQUAL 6.3)
    qt_standard_project_setup()
endif()

qt_add_executable(SpeedMeterApp src/main.cpp)

qt_add_resources(SpeedMeterApp "configuration"
    PREFIX "/"
    FILES
        qtquickcontrols2.conf
)

target_link_libraries(SpeedMeterApp PRIVATE
    Qt${QT_VERSION_MAJOR}::Core
    Qt${QT_VERSION_MAJOR}::Gui
    Qt${QT_VERSION_MAJOR}::Quick
    Qt${QT_VERSION_MAJOR}::Qml
)

if (BUILD_QDS_COMPONENTS)
    include(${CMAKE_CURRENT_SOURCE_DIR}/qmlcomponents)
endif()

include(${CMAKE_CURRENT_SOURCE_DIR}/qmlmodules)

if (LINK_INSIGHT)
    include(${CMAKE_CURRENT_SOURCE_DIR}/insight)
endif ()

include(GNUInstallDirs)
install(TARGETS SpeedMeterApp
  BUNDLE DESTINATION .
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

main.cpp:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>

#include "app_environment.h"
#include "import_qml_plugins.h"

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

    QQmlApplicationEngine engine;
    QObject object;
    object.setProperty("message", "Merhaba Dünya");

    engine.rootContext()->setContextProperty("cppObject", &object);

    engine.addImportPath(QStringLiteral("qrc:/"));
    engine.addImportPath(QStringLiteral("qml"));

    const QUrl url(QStringLiteral("qrc:/qt/qml/Main/main.qml"));
    engine.load(url);

    if (engine.rootObjects().isEmpty()) {
        return -1;
    }

    QObject::connect(
        &engine, &QQmlApplicationEngine::objectCreated, &app,
        [url](QObject *obj, const QUrl &objUrl) {
            if (!obj && url == objUrl)
                QCoreApplication::exit(-1);
        },
        Qt::QueuedConnection);

    return app.exec();
}

coredumpctl:

43832 1000 1000 SIGSEGV present  /home/amore/Projects/qtProject/SpeedMeter2/build7/SpeedMeterApp    4.3M

Thanks in advance.

jsulm

@Samed-Sucuk Run your app in debugger until it crashes and post the stack trace here

Samed Sucuk

@jsulm I build debug mode like this: "cmake -DCMAKE_BUILD_TYPE=Debug .." and "make --debug" didn't give error. But when i trying to ./SpeedMeterApp i take same error. I try to gdb ./SpeedMeterApp but does not give results.

jsulm

@Samed-Sucuk said in Segmentation fault (core dumped):

gdb ./SpeedMeterApp

but do you also run the app then in GDB?

Samed Sucuk

@jsulm Yes. Result is here:

Reading symbols from ./SpeedMeterApp...
(gdb) run
Starting program: /home/amore/Projects/qtProject/SpeedMeter2/debug2/SpeedMeterApp

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.archlinux.org>
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
Downloading separate debug info for system-supplied DSO at 0x7ffff7fc6000
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Downloading separate debug info for /usr/lib/libb2.so.1
Downloading separate debug info for /usr/lib/libpsl.so.5
Downloading separate debug info for /usr/lib/libunistring.so.5
[New Thread 0x7ffff1a006c0 (LWP 1705)]
[New Thread 0x7ffff10006c0 (LWP 1706)]
[New Thread 0x7fffebe006c0 (LWP 1707)]
[New Thread 0x7fffe90006c0 (LWP 1735)]
[New Thread 0x7fffe1a006c0 (LWP 1736)]
[New Thread 0x7fffe10006c0 (LWP 1737)]
[New Thread 0x7fffd3a006c0 (LWP 1738)]
[New Thread 0x7fffd30006c0 (LWP 1739)]
[New Thread 0x7fffd26006c0 (LWP 1740)]
[New Thread 0x7fffd1c006c0 (LWP 1741)]
[New Thread 0x7fffd12006c0 (LWP 1742)]
[New Thread 0x7fffcbe006c0 (LWP 1743)]
[Thread 0x7fffcbe006c0 (LWP 1743) exited]
[Thread 0x7fffd12006c0 (LWP 1742) exited]
[Thread 0x7fffd1c006c0 (LWP 1741) exited]
[New Thread 0x7fffd1c006c0 (LWP 1744)]
[New Thread 0x7fffd12006c0 (LWP 1745)]
[New Thread 0x7fffcbe006c0 (LWP 1746)]
[New Thread 0x7fffcb4006c0 (LWP 1747)]
[New Thread 0x7fffcaa006c0 (LWP 1748)]
Downloading separate debug info for /usr/lib/libnss_resolve.so.2

Thread 1 "SpeedMeterApp" received signal SIGSEGV, Segmentation fault.
0x00007fffea532b1f in QWidgetTextControl::setCursorWidth (this=0x555556d6fe20, width=-1) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/widgets/qwidgettextcontrol.cpp:2473
Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/widgets/qwidgettextcontrol.cpp
2473	        width = QApplication::style()->pixelMetric(QStyle::PM_TextCursorWidth, nullptr, qobject_cast<QWidget *>(parent()));

JoeCFD

@Samed-Sucuk As @GrecKo pointed out before, qml chart needs widgets module. Replacing QGuiApplication with QApplication will do the trick.

Samed Sucuk

@JoeCFD @jsulm @GrecKo Thanks for everything guys. I was change QGuiApplication to QApplication and

find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)

add this code my CMakeLists.txt and fixed my problem.

jsulm

@Samed-Sucuk Just as a tip: your app did crash in GDB, to get the stack trace type "bt" in GDB after the crash.