Details
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Bug
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Resolution: Out of scope
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P1: Critical
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None
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5.15.2
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None
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CentOS 8 Stream
kernel-4.18.0-358.el8.x86_64
qt5-rpm-macros-5.15.2-1.el8.noarch
qt5-qtxmlpatterns-devel-5.15.2-2.el8.x86_64
qt5-qtbase-devel-5.15.2-4.el8.x86_64
qt5-qtbase-gui-5.15.2-4.el8.x86_64
qt5-qtsvg-5.15.2-4.el8.x86_64
qt5-srpm-macros-5.15.2-1.el8.noarch
qt5-qtbase-5.15.2-4.el8.x86_64
qt5-qtxmlpatterns-5.15.2-2.el8.x86_64
qt5-qtmultimedia-5.15.2-2.el8.x86_64
qt5-qtbase-common-5.15.2-4.el8.noarch
qt5-qtdeclarative-5.15.2-2.el8.x86_64
qt5-qtsvg-devel-5.15.2-4.el8.x86_64CentOS 8 Stream kernel-4.18.0-358.el8.x86_64 qt5-rpm-macros-5.15.2-1.el8.noarch qt5-qtxmlpatterns-devel-5.15.2-2.el8.x86_64 qt5-qtbase-devel-5.15.2-4.el8.x86_64 qt5-qtbase-gui-5.15.2-4.el8.x86_64 qt5-qtsvg-5.15.2-4.el8.x86_64 qt5-srpm-macros-5.15.2-1.el8.noarch qt5-qtbase-5.15.2-4.el8.x86_64 qt5-qtxmlpatterns-5.15.2-2.el8.x86_64 qt5-qtmultimedia-5.15.2-2.el8.x86_64 qt5-qtbase-common-5.15.2-4.el8.noarch qt5-qtdeclarative-5.15.2-2.el8.x86_64 qt5-qtsvg-devel-5.15.2-4.el8.x86_64
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Linux/X11
Description
My GUI Application is freezed by a dead lock in QProcess with kernel 4.18.0-358.el8.x86_64, no problem with others kernels such as revisions 4.18.0-348.el8.x86_64 or 4.18.0-338.el8.x86_64.
I have reproduced the bug with a simple use case : a GUI application with only a push button to start a QProcess to tail a code file.
The pstack shows the lock after button click :
Thread 1 (Thread 0x7fa1903101c0 (LWP 1335)): #0 0x00007fa18d7498cd in syscall () from /lib64/libc.so.6 #1 0x00007fa18eaf7f1c in forkfd_wait4 () from /lib64/libQt5Core.so.5 #2 0x00007fa18eadbf24 in QProcessPrivate::waitForDeadChild() () from /lib64/libQt5Core.so.5 #3 0x00007fa18ead5fea in QProcessPrivate::_q_processDied() () from /lib64/libQt5Core.so.5 #4 0x00007fa18ead62e9 in QProcess::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5 #5 0x00007fa18eb80bb0 in void doActivate<false>(QObject*, int, void**) () from /lib64/libQt5Core.so.5 #6 0x00007fa18eb8354a in QSocketNotifier::activated(QSocketDescriptor, QSocketNotifier::Type, QSocketNotifier::QPrivateSignal) () from /lib64/libQt5Core.so.5 #7 0x00007fa18eb83d35 in QSocketNotifier::event(QEvent*) () from /lib64/libQt5Core.so.5 #8 0x00007fa18f9dc1e2 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5 #9 0x00007fa18f9e2f90 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5 #10 0x00007fa18eb4d6f2 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5 #11 0x00007fa18eba2597 in socketNotifierSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5 #12 0x00007fa189f5d95d in g_main_context_dispatch () from /lib64/libglib-2.0.so.0 #13 0x00007fa189f5dd18 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0 #14 0x00007fa189f5ddb0 in g_main_context_iteration () from /lib64/libglib-2.0.so.0 #15 0x00007fa18eba1c64 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5 #16 0x00007fa18eb4c3eb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5 #17 0x00007fa18eb54844 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5 #18 0x0000000000402b82 in main ()
MainWindows.cpp :
#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { QStringList arguments; arguments << "-f" << "-n5000" << qApp->applicationDirPath() + "/main.cpp"; process.start("tail", arguments); }
Find attached a project to reproduce this bug.
Attachments
Issue Links
- is duplicated by
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- Closed
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- Closed
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- Closed
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