Application: kde-print-queue (20.12.0)

Qt Version: 5.15.2
Frameworks Version: 5.77.0
Operating System: Linux 5.4.0-58-generic x86_64
Windowing system: X11
Distribution: KDE neon User Edition 5.20

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

I was deleting a job because of unrecognized location of the MFC-L2700DW printer. I've just changed the way the printer link to the router to fix this issue. Implicitclass driver looks like to have problems.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Coda di stampa (kde-print-queue), signal: Segmentation fault

[New LWP 3005]
[New LWP 3006]
[New LWP 3007]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f13928b5aff in __GI___poll (fds=0x7ffe6db6ba68, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
[Current thread is 1 (Thread 0x7f1392b7bac0 (LWP 3004))]

Thread 4 (Thread 0x7f138744e700 (LWP 3007)):
#0  0x00007f139153e72d in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f1391540185 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1391541aff in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1391542152 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f13915422e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1392e8dfbb in QEventDispatcherGlib::processEvents (this=0x7f1378000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f1392e321ab in QEventLoop::exec (this=this@entry=0x7f138744daa0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#7  0x00007f1392c4ca12 in QThread::exec (this=this@entry=0x55d5bbfaced0) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#8  0x00007f13943db07c in KCupsConnection::run (this=0x55d5bbfaced0) at ./libkcups/KCupsConnection.cpp:303
#9  0x00007f1392c4dbac in QThreadPrivate::start (arg=0x55d5bbfaced0) at thread/qthread_unix.cpp:329
#10 0x00007f1392151609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007f13928c2293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f1387c4f700 (LWP 3006)):
#0  0x00007f1392c4e0d0 in QMutex::lock (this=this@entry=0x55d5bbfa0040) at /usr/include/c++/9/bits/atomic_base.h:769
#1  0x00007f1392e8deb2 in QMutexLocker::QMutexLocker (m=0x55d5bbfa0040, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:233
#2  QThreadData::canWaitLocked (this=0x55d5bbfa0010) at ../../include/QtCore/5.15.2/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:272
#3  postEventSourcePrepare (s=0x7f1380004bb0, timeout=0x7f1387c4e8e4) at kernel/qeventdispatcher_glib.cpp:260
#4  0x00007f139154172f in g_main_context_prepare () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f13915420db in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f13915422e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f1392e8dfbb in QEventDispatcherGlib::processEvents (this=0x7f1380000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#8  0x00007f1392e321ab in QEventLoop::exec (this=this@entry=0x7f1387c4eab0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#9  0x00007f1392c4ca12 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#10 0x00007f13924b8f4b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#11 0x00007f1392c4dbac in QThreadPrivate::start (arg=0x7f139253cd80) at thread/qthread_unix.cpp:329
#12 0x00007f1392151609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#13 0x00007f13928c2293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f138dc57700 (LWP 3005)):
#0  0x00007f13928b5aff in __GI___poll (fds=0x7f138dc569e8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1391e73c1a in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1391e7590a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f138e1cfd58 in QXcbEventQueue::run (this=0x55d5bbed1300) at qxcbeventqueue.cpp:228
#4  0x00007f1392c4dbac in QThreadPrivate::start (arg=0x55d5bbed1300) at thread/qthread_unix.cpp:329
#5  0x00007f1392151609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f13928c2293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f1392b7bac0 (LWP 3004)):
[KCrash Handler]
#4  QStandardItem::text (this=0x0) at /usr/include/x86_64-linux-gnu/qt5/QtGui/qstandarditemmodel.h:75
#5  PrintQueueUi::modifyJob (this=0x55d5bbfff210, action=action@entry=0, destName=...) at ./printqueue/PrintQueueUi.cpp:489
#6  0x000055d5bbad520d in PrintQueueUi::cancelJob (this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qarraydata.h:257
#7  0x00007f1392e6a6be in QtPrivate::QSlotObjectBase::call (a=0x7ffe6db6c450, r=0x55d5bbfff210, this=0x55d5bc02fbf0) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#8  doActivate<false> (sender=0x55d5bc027370, signal_index=9, argv=0x7ffe6db6c450) at kernel/qobject.cpp:3886
#9  0x00007f1392e63a87 in QMetaObject::activate (sender=sender@entry=0x55d5bc027370, m=m@entry=0x7f1393e24600 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffe6db6c450) at kernel/qobject.cpp:3946
#10 0x00007f1393a05b56 in QAbstractButton::clicked (this=this@entry=0x55d5bc027370, _t1=<optimized out>) at .moc/moc_qabstractbutton.cpp:308
#11 0x00007f1393a05d7e in QAbstractButtonPrivate::emitClicked (this=0x55d5bc0273b0) at widgets/qabstractbutton.cpp:415
#12 0x00007f1393a07253 in QAbstractButtonPrivate::click (this=0x55d5bc0273b0) at widgets/qabstractbutton.cpp:408
#13 0x00007f1393a07415 in QAbstractButton::mouseReleaseEvent (this=0x55d5bc027370, e=0x7ffe6db6c9c0) at widgets/qabstractbutton.cpp:1044
#14 0x00007f1393950c06 in QWidget::event (this=0x55d5bc027370, event=0x7ffe6db6c9c0) at kernel/qwidget.cpp:8663
#15 0x00007f139390ddc3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55d5bc027370, e=0x7ffe6db6c9c0) at kernel/qapplication.cpp:3632
#16 0x00007f1393916e77 in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3076
#17 0x00007f1392e3369a in QCoreApplication::notifyInternal2 (receiver=0x55d5bc027370, event=0x7ffe6db6c9c0) at ../../include/QtCore/5.15.2/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#18 0x00007f13939160a7 in QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x55d5bc027370, event=event@entry=0x7ffe6db6c9c0, alienWidget=alienWidget@entry=0x55d5bc027370, nativeWidget=0x55d5bbfff210, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true, onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2614
#19 0x00007f139396be54 in QWidgetWindow::handleMouseEvent (this=0x55d5bc127e50, event=0x7ffe6db6ce40) at /usr/include/c++/9/bits/atomic_base.h:413
#20 0x00007f139396f174 in QWidgetWindow::event (event=0x7ffe6db6ce40, this=0x55d5bc127e50) at kernel/qwidgetwindow.cpp:300
#21 QWidgetWindow::event (this=0x55d5bc127e50, event=0x7ffe6db6ce40) at kernel/qwidgetwindow.cpp:239
#22 0x00007f139390ddc3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55d5bc127e50, e=0x7ffe6db6ce40) at kernel/qapplication.cpp:3632
#23 0x00007f1393916bb8 in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3156
#24 0x00007f1392e3369a in QCoreApplication::notifyInternal2 (receiver=0x55d5bc127e50, event=0x7ffe6db6ce40) at ../../include/QtCore/5.15.2/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#25 0x00007f13932184e8 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at kernel/qguiapplication.cpp:2282
#26 0x00007f1393219b55 in QGuiApplicationPrivate::processWindowSystemEvent (e=0x55d5bc0edfb0) at kernel/qguiapplication.cpp:2002
#27 0x00007f13931f17ac in QWindowSystemInterface::sendWindowSystemEvents (flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#28 0x00007f138e1d0d7e in xcbSourceDispatch (source=<optimized out>) at qxcbeventdispatcher.cpp:105
#29 0x00007f1391541fbd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f1391542240 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f13915422e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f1392e8dfa2 in QEventDispatcherGlib::processEvents (this=0x55d5bbf9a4b0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#33 0x00007f1392e321ab in QEventLoop::exec (this=this@entry=0x55d5bc0490d8, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#34 0x00007f13943e328b in KCupsRequest::waitTillFinished (this=this@entry=0x55d5bc0490c0) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qflags.h:121
#35 0x000055d5bbad4c9c in PrintQueueUi::modifyJob (this=0x55d5bbfff210, action=action@entry=0, destName=...) at ./printqueue/PrintQueueUi.cpp:486
#36 0x000055d5bbad520d in PrintQueueUi::cancelJob (this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qarraydata.h:257
#37 0x00007f1392e6a6be in QtPrivate::QSlotObjectBase::call (a=0x7ffe6db6d3c0, r=0x55d5bbfff210, this=0x55d5bc02fbf0) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#38 doActivate<false> (sender=0x55d5bc027370, signal_index=9, argv=0x7ffe6db6d3c0) at kernel/qobject.cpp:3886
#39 0x00007f1392e63a87 in QMetaObject::activate (sender=sender@entry=0x55d5bc027370, m=m@entry=0x7f1393e24600 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffe6db6d3c0) at kernel/qobject.cpp:3946
#40 0x00007f1393a05b56 in QAbstractButton::clicked (this=this@entry=0x55d5bc027370, _t1=<optimized out>) at .moc/moc_qabstractbutton.cpp:308
#41 0x00007f1393a05d7e in QAbstractButtonPrivate::emitClicked (this=0x55d5bc0273b0) at widgets/qabstractbutton.cpp:415
#42 0x00007f1393a07253 in QAbstractButtonPrivate::click (this=0x55d5bc0273b0) at widgets/qabstractbutton.cpp:408
#43 0x00007f1393a07415 in QAbstractButton::mouseReleaseEvent (this=0x55d5bc027370, e=0x7ffe6db6d930) at widgets/qabstractbutton.cpp:1044
#44 0x00007f1393950c06 in QWidget::event (this=0x55d5bc027370, event=0x7ffe6db6d930) at kernel/qwidget.cpp:8663
#45 0x00007f139390ddc3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55d5bc027370, e=0x7ffe6db6d930) at kernel/qapplication.cpp:3632
#46 0x00007f1393916e77 in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3076
#47 0x00007f1392e3369a in QCoreApplication::notifyInternal2 (receiver=0x55d5bc027370, event=0x7ffe6db6d930) at ../../include/QtCore/5.15.2/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#48 0x00007f13939160a7 in QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x55d5bc027370, event=event@entry=0x7ffe6db6d930, alienWidget=alienWidget@entry=0x55d5bc027370, nativeWidget=0x55d5bbfff210, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true, onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2614
#49 0x00007f139396be54 in QWidgetWindow::handleMouseEvent (this=0x55d5bc127e50, event=0x7ffe6db6ddb0) at /usr/include/c++/9/bits/atomic_base.h:413
#50 0x00007f139396f174 in QWidgetWindow::event (event=0x7ffe6db6ddb0, this=0x55d5bc127e50) at kernel/qwidgetwindow.cpp:300
#51 QWidgetWindow::event (this=0x55d5bc127e50, event=0x7ffe6db6ddb0) at kernel/qwidgetwindow.cpp:239
#52 0x00007f139390ddc3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55d5bc127e50, e=0x7ffe6db6ddb0) at kernel/qapplication.cpp:3632
#53 0x00007f1393916bb8 in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3156
#54 0x00007f1392e3369a in QCoreApplication::notifyInternal2 (receiver=0x55d5bc127e50, event=0x7ffe6db6ddb0) at ../../include/QtCore/5.15.2/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#55 0x00007f13932184e8 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at kernel/qguiapplication.cpp:2282
#56 0x00007f1393219b55 in QGuiApplicationPrivate::processWindowSystemEvent (e=0x55d5bc1411c0) at kernel/qguiapplication.cpp:2002
#57 0x00007f13931f17ac in QWindowSystemInterface::sendWindowSystemEvents (flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#58 0x00007f138e1d0d7e in xcbSourceDispatch (source=<optimized out>) at qxcbeventdispatcher.cpp:105
#59 0x00007f1391541fbd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007f1391542240 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#61 0x00007f13915422e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#62 0x00007f1392e8dfa2 in QEventDispatcherGlib::processEvents (this=0x55d5bbf9a4b0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#63 0x00007f1392e321ab in QEventLoop::exec (this=this@entry=0x7ffe6db6e150, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#64 0x00007f1392e3a354 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#65 0x000055d5bbad1547 in main (argc=<optimized out>, argv=<optimized out>) at ./printqueue/main.cpp:65
[Inferior 1 (process 3004) detached]

Possible duplicates by query: bug 326455.

Reported using DrKonqi