x00007ffff5d0670d in poll () at ../sysdeps/unix/syscall-template.S:84 84 ../sysdeps/unix/syscall-template.S: No such file or directory. (gdb) where #0 0x00007ffff5d0670d in poll () at ../sysdeps/unix/syscall-template.S:84 #1 0x00007ffff3eff38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007ffff3eff49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007ffff663e07f in QEventDispatcherGlib::processEvents (this=0x4de690, flags=...) at kernel/qeventdispatcher_glib.cpp:423 #4 0x00007ffff65e689a in QEventLoop::exec (this=this@entry=0xd1d3f0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #5 0x00007ffff6b81442 in QBasicDrag::drag (this=0x4cf690, o=) at kernel/qsimpledrag.cpp:195 #6 0x00007ffff6b9e449 in QDragManager::drag (this=0xd8f750, o=o@entry=0xdb2630) at kernel/qdnd.cpp:141 #7 0x00007ffff6b9cd87 in QDrag::exec (this=this@entry=0xdb2630, supportedActions=..., supportedActions@entry=..., defaultDropAction=) at kernel/qdrag.cpp:284 #8 0x00007ffff736daa8 in QAbstractItemView::startDrag (this=0x82ead0, supportedActions=...) at itemviews/qabstractitemview.cpp:3679 #9 0x00007ffff736c516 in QAbstractItemView::mouseMoveEvent (this=this@entry=0x82ead0, event=event@entry= 0x7fffffffc470) at itemviews/qabstractitemview.cpp:1836 #10 0x00007ffff73a49d7 in QListView::mouseMoveEvent (this=0x82ead0, e=0x7fffffffc470) at itemviews/qlistview.cpp:779 #11 0x00007ffff7158138 in QWidget::event (this=this@entry=0x82ead0, event=event@entry=0x7fffffffc470) at kernel/qwidget.cpp:9198 #12 0x00007ffff71ff65e in QFrame::event (this=0x82ead0, e=0x7fffffffc470) at widgets/qframe.cpp:550 #13 0x00007ffff736d013 in QAbstractItemView::viewportEvent (this=0x82ead0, event=0x7fffffffc470) at itemviews/qabstractitemview.cpp:1748 #14 0x00007ffff65e85d2 in QCoreApplicationPrivate::sendThroughObjectEventFilters (receiver=receiver@entry= 0xbfd680, event=event@entry=0x7fffffffc470) at kernel/qcoreapplication.cpp:1129 #15 0x00007ffff7119165 in QApplicationPrivate::notify_helper (this=, receiver=0xbfd680, e=0x7fffffffc470) at kernel/qapplication.cpp:3718 #16 0x00007ffff71217bb in QApplication::notify (this=, receiver=0xbfd680, e=0x7fffffffc470) at kernel/qapplication.cpp:3198 #17 0x00007ffff65e8868 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0xbfd680, event=event@entry=0x7fffffffc470) at kernel/qcoreapplication.cpp:1018 #18 0x00007ffff712015f in QCoreApplication::sendEvent (event=, receiver=) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233 #19 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0xbfd680, event=event@entry=0x7fffffffc470, alienWidget=alienWidget@entry=0xbfd680, nativeWidget=0x7fffffffccb0, buttonDown=buttonDown@entry=0x7ffff761ac80 , lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2704 #20 0x00007ffff7172146 in QWidgetWindow::handleMouseEvent (this=this@entry=0xdc4640, ---Type to continue, or q to quit--- event=event@entry=0x7fffffffc870) at kernel/qwidgetwindow.cpp:622 #21 0x00007ffff7174ba3 in QWidgetWindow::event ()