I installed plasma-workspace-dbg and got a new crash so here is the backtrace for the crashing thread. Unfortunately I did not find a dbg package for libqt5qml5.
Thread 1 (Thread 0x7f49f97b7940 (LWP 8428)): [KCrash Handler] #6 0x00007f49f6c46358 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #7 0x00007f49f6eb597a in QQmlDelegateModel::_q_itemsChanged(int, int, QVector<int> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #8 0x00007f49f6edd04c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #9 0x00007f49f6edd838 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #10 0x00007f49f47f4860 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #11 0x00007f49f4870bbc in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #12 0x00007f49c8304884 in TaskManager::TasksModelPrivate::itemChanged (this=0x3c5b7b0, changes=...) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/libtaskmanager/tasksmodel.cpp:521 #13 0x00007f49c8305b07 in TaskManager::TasksModel::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7ffdbae20ba0) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/obj-x86_64-linux-gnu/libtaskmanager/moc_tasksmodel.cpp:214 #14 0x00007f49f47f46aa in QObjectPrivate::~QObjectPrivate() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #15 0xc55653c6e1c0fb00 in ?? () #16 0x00007f49c852b6f0 in __bss_start () from /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5 #17 0x00007f49c8300aba in TaskManager::TaskManager::taskChanged (this=0x4387050, changes=...) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/libtaskmanager/taskmanager.cpp:385 #18 0x00007f49c830da28 in TaskManager::AbstractGroupableItem::changed (this=<optimized out>, _t1=...) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/obj-x86_64-linux-gnu/libtaskmanager/moc_abstractgroupableitem.cpp:223 #19 0x00007f49c82faf70 in TaskManager::TaskItemPrivate::filterChange (change=..., this=<optimized out>) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/libtaskmanager/taskitem.cpp:73 #20 TaskManager::TaskItem::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /build/plasma-workspace-KFkJSD/plasma-workspace-5.4.3/obj-x86_64-linux-gnu/libtaskmanager/moc_taskitem.cpp:147 #21 0x00007f49f47f46aa in QObjectPrivate::~QObjectPrivate() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #22 0x0000000000000e10 in ?? () #23 0x0000000001bdab60 in ?? () #24 0x0000000000000000 in ?? () Also here is more information about my configuration: Video card: $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) Video driver: $ lsmod | grep 915 snd_hda_codec_hdmi 49152 1 i915 1122304 16 drm_kms_helper 131072 1 i915 drm 348160 17 i915,drm_kms_helper i2c_algo_bit 16384 1 i915 video 36864 2 i915,asus_wmi button 16384 1 i915 parport 49152 3 lp,ppdev,parport_pc usbhid 49152 0 Kernel: $ cat /proc/version Linux version 4.3.0-1-amd64 (debian-ker...@lists.debian.org) (gcc version 5.3.1 20160121 (Debian 5.3.1-7) ) #1 SMP Debian 4.3.5-1 (2016-02-06) -- Francois Gouget <fgou...@free.fr> http://fgouget.free.fr/ The nice thing about meditation is that it makes doing nothing quite respectable -- Paul Dean