Version:           unspecified (using Devel) 
OS:                Linux

From time to time I encounter dolphin freezes when opening a file.
Dolphin blocks for about 20s (does not even redraw itself), but then executes the required operation sucessfully and starts the application for the file.

One time I was quick enough to get a pstack stacktrace during Dolphin freeze:

#0  0x00280832 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x0047123c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x00a3eda7 in _dbus_pthread_condvar_wait () from /lib/libdbus-1.so.3
#3  0x00a352d4 in _dbus_condvar_wait () from /lib/libdbus-1.so.3
#4  0x00a1f90a in _dbus_connection_acquire_io_path () from /lib/libdbus-1.so.3
#5  0x00a1fda6 in _dbus_connection_do_iteration_unlocked () from /lib/libdbus-1.so.3
#6  0x00a206a8 in _dbus_connection_flush_unlocked () from /lib/libdbus-1.so.3
#7  0x00a2247f in _dbus_connection_block_pending_call () from /lib/libdbus-1.so.3
#8  0x00a302a2 in dbus_pending_call_block () from /lib/libdbus-1.so.3
#9  0x00a21a8c in dbus_connection_send_with_reply_and_block () from /lib/libdbus-1.so.3
#10 0x0453eb8d in QDBusConnectionPrivate::sendWithReply(QDBusMessage const&, int, int) () from /usr/lib/libQtDBus.so.4
#11 0x0452abfb in QDBusConnection::call(QDBusMessage const&, QDBus::CallMode, int) const () from /usr/lib/libQtDBus.so.4
#12 0x04548f9b in QDBusAbstractInterface::callWithArgumentList(QDBus::CallMode, QString const&, QList<QVariant> const&) () from /usr/lib/libQtDBus.so.4
#13 0x045495bf in QDBusAbstractInterface::internalConstCall(QDBus::CallMode, QString const&, QList<QVariant> const&) const () from /usr/lib/libQtDBus.so.4
#14 0x0452e022 in QDBusConnectionInterface::isServiceRegistered(QString const&) const () from /usr/lib/libQtDBus.so.4
#15 0x047fc2eb in KToolInvocation::klauncher() () from /usr/lib/libkdecore.so.5
#16 0x047fdc20 in KToolInvocation::startServiceInternal(char const*, QString const&, QStringList const&, QString*, QString*, int*, QByteArray const&, bool, QString const&) () from /usr/lib/libkdecore.so.5
#17 0x047ffd86 in KToolInvocation::startServiceByDesktopPath(QString const&, QStringList const&, QString*, QString*, int*, QByteArray const&, bool) () from /usr/lib/libkdecore.so.5
#18 0x0617930d in KRun::run(KService const&, KUrl::List const&, QWidget*, bool, QString const&, QByteArray const&) () from /usr/lib/libkio.so.5
#19 0x0617c4bf in KRun::runUrl(KUrl const&, QString const&, QWidget*, bool, bool, QString const&, QByteArray const&) () from /usr/lib/libkio.so.5
#20 0x0617ce88 in KRun::foundMimeType(QString const&) () from /usr/lib/libkio.so.5
#21 0x06170f11 in KRun::mimeTypeDetermined(QString const&) () from /usr/lib/libkio.so.5
#22 0x0617a6e1 in KRun::init() () from /usr/lib/libkio.so.5
#23 0x06171bbc in KRun::slotTimeout() () from /usr/lib/libkio.so.5
#24 0x061749fb in KRun::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#25 0x043a706b in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
#26 0x043b6085 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#27 0x04401de8 in QTimer::timeout() () from /usr/lib/libQtCore.so.4
#28 0x043bd3ee in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQtCore.so.4
#29 0x043b3dc4 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#30 0x0504c88c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#31 0x05053206 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#32 0x05b6634b in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#33 0x043a1a73 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#34 0x043cebbe in QTimerInfoList::activateTimers() () from /usr/lib/libQtCore.so.4
#35 0x043cc2e5 in timerSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib/libQtCore.so.4
#36 0x004dd525 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#37 0x004e1268 in g_main_context_iterate () from /lib/libglib-2.0.so.0
#38 0x004e1449 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#39 0x043cbfd6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x050fccf6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtGui.so.4
#41 0x043a060a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#42 0x043a094a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#43 0x043a4f77 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#44 0x0504b868 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#45 0x0660ac23 in kdemain () from /usr/lib/libkdeinit4_dolphin.so
#46 0x0804872c in main ()


Reproducible: Didn't try