https://bugs.kde.org/show_bug.cgi?id=418732
Bug ID: 418732
Summary: Discover hangs on "fetching updates"
Product: Discover
Version: 5.18.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: fwupd Backend
Assignee: sharma.abhijeet2...@gmail.com
Reporter: ber...@codewiz.org
CC: lei...@leinir.dk
Target Milestone: ---
(note: this happened with discover 5.18.2, but there's no such version in
Bugzilla)
I opened discover and it started fetching updates. After a few minutes, I
realized it was just burning 200% CPU (i.e. two active threads) without making
any progress.
So I closed the window, but it kept running in the background and burning CPU.
I was able to take this stacktrace of the main thread:
#0 0x00007ffff51feea2 in pthread_cond_wait@@GLIBC_2.3.2 () at
/lib64/libpthread.so.0
#1 0x00007ffff60ff5a3 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at
/lib64/libQt5Core.so.5
#2 0x00007ffff60fc28f in QThreadPoolPrivate::waitForDone(QDeadlineTimer
const&) () at /lib64/libQt5Core.so.5
#3 0x00007ffff60fc60a in QThreadPoolPrivate::waitForDone(int) () at
/lib64/libQt5Core.so.5
#4 0x00007ffff60fc6c0 in QThreadPool::~QThreadPool() () at
/lib64/libQt5Core.so.5
#5 0x00007fffc40a6bc1 in FwupdBackend::~FwupdBackend() (this=0x555556316390,
__in_chrg=<optimized out>)
at
/usr/src/debug/plasma-discover-5.18.2-1.fc32.x86_64/libdiscover/backends/FwupdBackend/FwupdBackend.cpp:71
#6 0x00007fffc40a6c4d in FwupdBackend::~FwupdBackend() (this=0x555556316390,
__in_chrg=<optimized out>)
at
/usr/src/debug/plasma-discover-5.18.2-1.fc32.x86_64/libdiscover/backends/FwupdBackend/FwupdBackend.cpp:63
#7 0x00007ffff7e78b3e in
qDeleteAll<QTypedArrayData<AbstractResourcesBackend*>::const_iterator>(QTypedArrayData<AbstractResourcesBackend*>::const_iterator,
QTypedArrayData<AbstractResourcesBackend*>::const_iterator) (end=<optimized
out>, begin=<optimized out>) at /usr/include/qt5/QtCore/qalgorithms.h:319
#8 qDeleteAll<QVector<AbstractResourcesBackend*>
>(QVector<AbstractResourcesBackend*> const&) (c=<optimized out>,
c=@0x55555573b9c8: {
d = 0x5555562ee070
}) at /usr/include/qt5/QtCore/qalgorithms.h:328
#9 ResourcesModel::~ResourcesModel() (this=0x55555573b9b0,
__in_chrg=<optimized out>) at
/usr/src/debug/plasma-discover-5.18.2-1.fc32.x86_64/libdiscover/resources/ResourcesModel.cpp:102
#10 0x00007ffff7e78b7d in ResourcesModel::~ResourcesModel()
(this=0x55555573b9b0, __in_chrg=<optimized out>)
at
/usr/src/debug/plasma-discover-5.18.2-1.fc32.x86_64/libdiscover/resources/ResourcesModel.cpp:99
#11 0x00007ffff62ab164 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#12 0x00007ffff70c4e66 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /lib64/libQt5Widgets.so.5
#13 0x00007ffff6284860 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /lib64/libQt5Core.so.5
#14 0x00007ffff6287af3 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () at /lib64/libQt5Core.so.5
#15 0x00007ffff628adcf in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#16 0x000055555556b4fd in main(int, char**) (argc=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/plasma-discover-5.18.2-1.fc32.x86_64/discover/main.cpp:179
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