Application: ktorrent (5.1.0)

Qt Version: 5.9.1
Frameworks Version: 5.38.0
Operating System: Linux 4.13.0-19-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
- What I was doing when the application crashed:

- Unusual behavior I noticed:
For a few days now, the software has not downloaded anything.
When I tried to delete the data created by the program, I realized that they were not there. I have purged ktorrent and ktorrent-data and at the start it remains all set up the same.
If I run it from the terminal, it tells me that "No machine name has been given", even though I have checked the hosts and hostname file and they are correct.
If I open ktorrent from the terminal and close it, it breaks.
- Custom settings of the application:

The crash can be reproduced every time.

-- Backtrace:
Application: KTorrent (ktorrent), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7faf0401c040 (LWP 8508))]

Thread 3 (Thread 0x7faee3fff700 (LWP 8512)):
#0  0x00007faef81b45d4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007faef816e642 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007faef816f09b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007faef816f27c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007faeff07849b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007faeff01de3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007faefee3d3ca in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007faefee4229d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007faef9cde7fc in start_thread (arg=0x7faee3fff700) at pthread_create.c:465
#9  0x00007faefe1d7b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7faee99bd700 (LWP 8510)):
#0  0x00007faefe1cb901 in __GI___poll (fds=0x7faedc01e780, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007faef816f169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007faef816f27c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007faeff07849b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007faeff01de3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007faefee3d3ca in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007faf0049fe45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007faefee4229d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007faef9cde7fc in start_thread (arg=0x7faee99bd700) at pthread_create.c:465
#9  0x00007faefe1d7b0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7faf0401c040 (LWP 8508)):
[KCrash Handler]
#6  0x00007faeff06075d in QVariant::QVariant(QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x000055d04113233c in ?? ()
#8  0x000055d0411341ad in ?? ()
#9  0x00007faf0005f1bc in QStyledItemDelegate::initStyleOption(QStyleOptionViewItem*, QModelIndex const&) const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007faf0005e6bc in QStyledItemDelegate::sizeHint(QStyleOptionViewItem const&, QModelIndex const&) const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x000055d041137ca4 in ?? ()
#12 0x00007faf00020b8a in QTreeView::indexRowSizeHint(QModelIndex const&) const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007faf000214fe in QTreeViewPrivate::layout(int, bool, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007faf000294be in QTreeView::doItemsLayout() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007faf00023cc5 in QTreeViewPrivate::updateScrollBars() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007faf0002b008 in QTreeView::updateGeometries() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007faefffe4ae9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007faeff04e8e5 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007faeffffa5f1 in QHeaderView::viewportEvent(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007faeff01facc in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007faeffd9a445 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007faeffda1d34 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007faeff01fde8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007faeffdd60fa in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007faeffdd60e2 in QWidgetPrivate::hideChildren(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007faeffdd63c4 in QWidgetPrivate::hide_helper() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007faeffddab20 in QWidget::setVisible(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007faeffdd6688 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007faeffdd6cd0 in QWidget::~QWidget() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007faf029ba88d in KMainWindow::~KMainWindow() () from /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#37 0x000055d0410c0a27 in ?? ()
#38 0x000055d0410b0032 in ?? ()
#39 0x00007faefe0e41c1 in __libc_start_main (main=0x55d0410add60, argc=1, argv=0x7ffc18a24f08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc18a24ef8) at ../csu/libc-start.c:308
#40 0x000055d0410b0a0a in _start ()

Possible duplicates by query: bug 386387, bug 385766, bug 385761, bug 385543.

Reported using DrKonqi