It's possible I have missed information and I have not well locate the problem:

How I do it:
u...@amber ~ $ ulimit -n 1
u...@amber ~ $ ktorrent
u...@amber ~ $ QMetaObject::invokeMethod: No such method 
kt::App::loadCommandLineOptionsForNewInstance()
Critical: ktorrent(30150)/kdeui (KIconLoader): Error: standard icon theme 
"oxygen" not found! 

Warning: QObject::connect: Connecting from QAction::toggled(bool) to COMPAT 
slot (kt::HintLineEdit::setShown(bool))
u...@amber ~ $ 
GLib-ERROR **: Cannot create pipe main loop wake-up: Too many open files

aborting...

GLib-ERROR **: Cannot create pipe main loop wake-up: Too many open files

aborting...
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = ktorrent path = /usr/bin pid = 30150
KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
sock_file=/home/user/.kde4/socket-amber/kdeinit4__0
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = ktorrent path = /usr/bin pid = 30150
KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
sock_file=/home/user/.kde4/socket-amber/kdeinit4__0
Warning: ktorrent: Fatal IO error: client killed
 

And:
#0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9a3bccc91b in wait (this=<value optimized out>, mutex=0x229c800, 
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x229c800, 
time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f9a3bcbecdb in QThreadPoolPrivate::waitForDone (this=0x229c770) at 
concurrent/qthreadpool.cpp:295
#4  0x00007f9a3bcbed8d in QThreadPool::waitForDone (this=<value optimized out>) 
at concurrent/qthreadpool.cpp:616
#5  0x00007f9a3c6fae57 in QHostInfoLookupManager::clear (this=0x229d180) at 
kernel/qhostinfo.cpp:517
#6  0x00007f9a3c6fafe1 in QHostInfoLookupManager::~QHostInfoLookupManager 
(this=0x229c8fc, __in_chrg=<value optimized out>) at kernel/qhostinfo.cpp:502
#7  0x00007f9a3c6fc895 in 
QGlobalStaticDeleter<QHostInfoLookupManager>::~QGlobalStaticDeleter 
(this=0x7f9a3c999298, __in_chrg=<value optimized out>) at 
../../include/QtCore/../../src/corelib/global/qglobal.h:1820
#8  0x00007f9a3a174bd5 in __run_exit_handlers (status=1, listp=0x7f9a3a4934a8, 
run_list_atexit=true) at exit.c:78
#9  0x00007f9a3a174c25 in exit (status=36292860) at exit.c:100
#10 0x00007f9a3ae9efe8 in qt_xio_errhandler () at 
kernel/qapplication_x11.cpp:773
#11 0x00007f9a3ce11ea8 in KApplication::xioErrhandler (this=0x7ffffb738e20, 
dpy=0x17da050) at 
/var/tmp/portage/kde-base/kdelibs-4.5.4/work/kdelibs-4.5.4/kdeui/kernel/kapplication.cpp:416
#12 0x00007f9a3848640e in _XIOError (dpy=0x17da050) at XlibInt.c:1602
#13 0x00007f9a38484fbd in _XEventsQueued (dpy=0x17da050, mode=<value optimized 
out>) at xcb_io.c:307
#14 0x00007f9a3845a4de in XCheckTypedWindowEvent (dpy=0x17da050, w=65011759, 
type=22, event=0x7ffffb736d20) at ChkTypWEv.c:70
#15 0x00007f9a3aea291f in QETWidget::translateConfigEvent (this=0x1aa8040, 
event=<value optimized out>) at kernel/qapplication_x11.cpp:5285
#16 0x00007f9a3aeaff48 in QApplication::x11ProcessEvent (this=<value optimized 
out>, event=0x7ffffb7377a0) at kernel/qapplication_x11.cpp:3469
#17 0x00007f9a3aede8b2 in x11EventSourceDispatch (s=0x17bae10, callback=<value 
optimized out>, user_data=<value optimized out>) at 
kernel/qguieventdispatcher_glib.cpp:146
#18 0x00007f9a361dbbf1 in g_main_dispatch (context=0x17ba000) at gmain.c:1960
#19 IA__g_main_context_dispatch (context=0x17ba000) at gmain.c:2513
#20 0x00007f9a361dffc8 in g_main_context_iterate (context=0x17ba000, 
block=<value optimized out>, dispatch=<value optimized out>, self=<value 
optimized out>) at gmain.c:2591
#21 0x00007f9a361e01ac in IA__g_main_context_iteration (context=0x17ba000, 
may_block=1) at gmain.c:2654
#22 0x00007f9a3be153f3 in QEventDispatcherGlib::processEvents (this=0x17aca60, 
flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#23 0x00007f9a3aede0ee in QGuiEventDispatcherGlib::processEvents 
(this=0x229c8fc, flags=<value optimized out>) at 
kernel/qguieventdispatcher_glib.cpp:204
#24 0x00007f9a3bddf532 in QEventLoop::processEvents (this=<value optimized 
out>, flags=) at kernel/qeventloop.cpp:149
#25 0x00007f9a3bddf9d5 in QEventLoop::exec (this=0x7ffffb737ac0, flags=) at 
kernel/qeventloop.cpp:201
#26 0x00007f9a3b38e9de in QDialog::exec (this=0x22411a0) at 
dialogs/qdialog.cpp:552
#27 0x00007f9a3cd76b3e in KMessageBox::createKMessageBox (dialog=0x22411a0, 
icon=<value optimized out>, text=<value optimized out>, strlist=<value 
optimized out>, ask=<value optimized out>, checkboxReturn=<value optimized 
out>, options=..., details=..., notifyType=QMessageBox::Critical) at 
/var/tmp/portage/kde-base/kdelibs-4.5.4/work/kdelibs-4.5.4/kdeui/dialogs/kmessagebox.cpp:337
#28 0x00007f9a3cd77a14 in KMessageBox::createKMessageBox (dialog=0x22411a0, 
icon=QMessageBox::Critical, text=..., strlist=..., ask=..., 
checkboxReturn=<value optimized out>, options=..., details=...) at 
/var/tmp/portage/kde-base/kdelibs-4.5.4/work/kdelibs-4.5.4/kdeui/dialogs/kmessagebox.cpp:152
#29 0x00007f9a3cd78c1a in KMessageBox::errorListWId (parent_id=<value optimized 
out>, text=..., strlist=..., caption=<value optimized out>, options=) at 
/var/tmp/portage/kde-base/kdelibs-4.5.4/work/kdelibs-4.5.4/kdeui/dialogs/kmessagebox.cpp:847
#30 0x00007f9a3cd78e21 in KMessageBox::error (parent=0x0, text=..., 
caption=..., options=<value optimized out>) at 
/var/tmp/portage/kde-base/kdelibs-4.5.4/work/kdelibs-4.5.4/kdeui/dialogs/kmessagebox.cpp:814
#31 0x00007f9a3dab5042 in kt::QueueManager::startSafely (this=<value optimized 
out>, tc=<value optimized out>) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4/libktcore/torrent/queuemanager.cpp:739
#32 0x00007f9a3dab66c4 in kt::QueueManager::startInternal (this=0x18ee2a0, 
tc=0x1af10d0) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4/libktcore/torrent/queuemanager.cpp:104
#33 0x00007f9a3dab6c51 in kt::QueueManager::orderQueue (this=0x18ee2a0) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4/libktcore/torrent/queuemanager.cpp:588
#34 0x0000000000431f1f in kt::Core::qt_metacall (this=0x18ee0b0, 
_c=QMetaObject::InvokeMetaMethod, _id=-512, _a=0x1d63ff0) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4_build/ktorrent/core.moc:197
#35 0x00007f9a3bdf5d4e in QObject::event (this=0x18ee0b0, e=0x229c8fc) at 
kernel/qobject.cpp:1211
#36 0x00007f9a3ae0e7c0 in QApplicationPrivate::notify_helper (this=0x17b0d20, 
receiver=0x18ee0b0, e=0x1d641b0) at kernel/qapplication.cpp:4445
#37 0x00007f9a3ae16907 in QApplication::notify (this=0x7ffffb738e20, 
receiver=0x18ee0b0, e=0x1d641b0) at kernel/qapplication.cpp:4324
#38 0x000000000043f6f7 in kt::App::notify (this=0x7ffffb738e20, 
receiver=0x18ee0b0, event=0x1d641b0) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4/ktorrent/app.cpp:97
#39 0x00007f9a3bde0d0b in QCoreApplication::notifyInternal 
(this=0x7ffffb738e20, receiver=0x18ee0b0, event=0x1d641b0) at 
kernel/qcoreapplication.cpp:732
#40 0x00007f9a3bde23ab in sendEvent (receiver=0x0, event_type=<value optimized 
out>, data=0x17887c0) at kernel/qcoreapplication.h:215
#41 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value 
optimized out>, data=0x17887c0) at kernel/qcoreapplication.cpp:1373
#42 0x00007f9a3be158d3 in sendPostedEvents (s=0x17ba0e0) at 
kernel/qcoreapplication.h:220
#43 postEventSourceDispatch (s=0x17ba0e0) at 
kernel/qeventdispatcher_glib.cpp:277
#44 0x00007f9a361dbbf1 in g_main_dispatch (context=0x17ba000) at gmain.c:1960
#45 IA__g_main_context_dispatch (context=0x17ba000) at gmain.c:2513
#46 0x00007f9a361dffc8 in g_main_context_iterate (context=0x17ba000, 
block=<value optimized out>, dispatch=<value optimized out>, self=<value 
optimized out>) at gmain.c:2591
#47 0x00007f9a361e01ac in IA__g_main_context_iteration (context=0x17ba000, 
may_block=1) at gmain.c:2654
#48 0x00007f9a3be153f3 in QEventDispatcherGlib::processEvents (this=0x17aca60, 
flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#49 0x00007f9a3aede0ee in QGuiEventDispatcherGlib::processEvents 
(this=0x229c8fc, flags=<value optimized out>) at 
kernel/qguieventdispatcher_glib.cpp:204
#50 0x00007f9a3bddf532 in QEventLoop::processEvents (this=<value optimized 
out>, flags=) at kernel/qeventloop.cpp:149
#51 0x00007f9a3bddf9d5 in QEventLoop::exec (this=0x7ffffb738d90, flags=) at 
kernel/qeventloop.cpp:201
#52 0x00007f9a3bde26bb in QCoreApplication::exec () at 
kernel/qcoreapplication.cpp:1009
#53 0x000000000042aeb2 in main (argc=<value optimized out>, argv=<value 
optimized out>) at 
/var/tmp/portage/net-p2p/ktorrent-4.0.4/work/ktorrent-4.0.4/ktorrent/main.cpp:176


-- 
alpha_one_x86 <alpha_one_...@first-world.info>
Main developer of Ultracopier, Esourcing and server management
IT, OS, technologies, security and business department

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