https://bugs.kde.org/show_bug.cgi?id=411286

--- Comment #22 from Chris <christopherbwilliams1...@gmail.com> ---
Here is a full back trace using gdb, and reproducing the crash:

    GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
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Reading symbols from plasma-discover...Reading symbols from
/usr/lib/debug/.build-id/fc/5dbb5889066a0e46f3104784a591182c73d029.debug...done.
done.
(gdb) run
Starting program: /usr/bin/plasma-discover 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe2dce700 (LWP 5172)]
[New Thread 0x7fffdaf02700 (LWP 5173)]
[New Thread 0x7fffd9cf1700 (LWP 5174)]
[New Thread 0x7fffc5ba4700 (LWP 5175)]
adding empty sources model QStandardItemModel(0x55555604db40)
no packages for "org.kde.plasma.quicklaunch"
no packages for "org.kde.plasma.systemloadviewer"
no packages for "org.kde.plasma.showActivityManager"
no packages for "org.kde.plasma.grouping"
no packages for "org.kde.plasma.diskquota"
no packages for "org.kde.plasma.timer"
no packages for "org.kde.kscreen"
no packages for "org.kde.plasma.appmenu"
no packages for "im.riot.webapp"
no packages for "org.kde.plasma.kimpanel"
no packages for "org.cockpit_project.cockpit"
[New Thread 0x7fff98a57700 (LWP 5177)]
[New Thread 0x7fff9344a700 (LWP 5178)]
[New Thread 0x7fff92c49700 (LWP 5179)]
[New Thread 0x7fff9203e700 (LWP 5180)]
invalid kns backend! "/usr/share/knsrcfiles/ksysguard.knsrc" because: "Config
group not found! Check your KNS3 installation."
took really long to fetch PackageKitBackend(0x555555955100)
[New Thread 0x7fff9115e700 (LWP 5189)]
[New Thread 0x7fff9095d700 (LWP 5190)]
QNetworkReplyImpl: setCachingEnabled(true) called after
setCachingEnabled(false)
took really long to fetch KNSBackend(0x555557a5e440, name =
"/usr/share/knsrcfiles/cgctheme.knsrc")
qrc:/qml/ApplicationsListPage.qml:144:16: QML ResourcesProxyModel: Binding loop
detected for property "sortOrder"

Thread 1 "plasma-discover" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) thread apply all backtrace

Thread 11 (Thread 0x7fff9095d700 (LWP 5190)):
#0  0x00007fffef980ed9 in futex_reltimed_wait_cancelable (private=<optimized
out>, reltime=0x7fff9095caa0, expected=0, futex_word=0x7fff8c007160)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fffef980ed9 in __pthread_cond_wait_common (abstime=0x7fff9095cb60,
mutex=0x7fff8c007110, cond=0x7fff8c007138) at pthread_cond_wait.c:533
#2  0x00007fffef980ed9 in __pthread_cond_timedwait (cond=0x7fff8c007138,
mutex=0x7fff8c007110, abstime=0x7fff9095cb60) at pthread_cond_wait.c:667
#3  0x00007ffff32f6d36 in QWaitCondition::wait(QMutex*, QDeadlineTimer) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff32f7096 in QWaitCondition::wait(QMutex*, unsigned long) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32f4740 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff9095d700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fff9115e700 (LWP 5189)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fff88001990, nfds=1,
timeout=129904) at ../sysdeps/unix/sysv/linux/poll.c:29
---Type <return> to continue, or q <return> to quit---
#1  0x00007fffed0985c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffed0986dc in g_main_context_iteration ()
    at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff3525daf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff34c703a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32ee4ca in QThread::exec() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff9115e700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fff9203e700 (LWP 5180)):
#0  0x00007fffef980ed9 in futex_reltimed_wait_cancelable (private=<optimized
out>, reltime=0x7fff9203daa0, expected=0, futex_word=0x7fff8c0053b0)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fffef980ed9 in __pthread_cond_wait_common (abstime=0x7fff9203db60,
mutex=0x7fff8c005360, cond=0x7fff8c005388) at pthread_cond_wait.c:533
#2  0x00007fffef980ed9 in __pthread_cond_timedwait (cond=0x7fff8c005388,
mutex=0x7fff8c005360, abstime=0x7fff9203db60) at pthread_cond_wait.c:667
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff32f6d36 in QWaitCondition::wait(QMutex*, QDeadlineTimer) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff32f7096 in QWaitCondition::wait(QMutex*, unsigned long) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32f4740 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff9203e700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fff92c49700 (LWP 5179)):
#0  0x00007fffef980ed9 in futex_reltimed_wait_cancelable (private=<optimized
out>, reltime=0x7fff92c48aa0, expected=0, futex_word=0x7fff8c003474)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  0x00007fffef980ed9 in __pthread_cond_wait_common (abstime=0x7fff92c48b60,
mutex=0x7fff8c003420, cond=0x7fff8c003448) at pthread_cond_wait.c:533
#2  0x00007fffef980ed9 in __pthread_cond_timedwait (cond=0x7fff8c003448,
mutex=0x7fff8c003420, abstime=0x7fff92c48b60) at pthread_cond_wait.c:667
#3  0x00007ffff32f6d36 in QWaitCondition::wait(QMutex*, QDeadlineTimer) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff32f7096 in QWaitCondition::wait(QMutex*, unsigned long) ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#5  0x00007ffff32f4740 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff92c49700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fff9344a700 (LWP 5178)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fff8c1c60e0, nfds=1,
timeout=127479) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffed0985c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffed0986dc in g_main_context_iteration ()
    at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff3525daf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff34c703a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32ee4ca in QThread::exec() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff9344a700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
---Type <return> to continue, or q <return> to quit---
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fff98a57700 (LWP 5177)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fff940018d0, nfds=1,
timeout=9627) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffed0985c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffed0986dc in g_main_context_iteration ()
    at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff3525daf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff34c703a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32ee4ca in QThread::exec() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffef97a6db in start_thread (arg=0x7fff98a57700)
    at pthread_create.c:463
#8  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fffc5ba4700 (LWP 5175)):
#0  0x00007fffef9809f3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x555555a256d8)
---Type <return> to continue, or q <return> to quit---
    at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fffef9809f3 in __pthread_cond_wait_common (abstime=0x0,
mutex=0x555555a25688, cond=0x555555a256b0) at pthread_cond_wait.c:502
#2  0x00007fffef9809f3 in __pthread_cond_wait (cond=0x555555a256b0,
mutex=0x555555a25688) at pthread_cond_wait.c:655
#3  0x00007fffcb6c923a in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007fffcb6c8f67 in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007fffef97a6db in start_thread (arg=0x7fffc5ba4700)
    at pthread_create.c:463
#6  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fffd9cf1700 (LWP 5174)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fffcc004a00, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffed0985c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffed0986dc in g_main_context_iteration ()
    at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff3525daf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff34c703a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32ee4ca in QThread::exec() ()
---Type <return> to continue, or q <return> to quit---
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff42d9115 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fffef97a6db in start_thread (arg=0x7fffd9cf1700)
    at pthread_create.c:463
#9  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fffdaf02700 (LWP 5173)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fffd4018040, nfds=4, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffed0985c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffed0986dc in g_main_context_iteration ()
    at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff3525daf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff34c703a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff32ee4ca in QThread::exec() ()
    at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff4677015 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fffef97a6db in start_thread (arg=0x7fffdaf02700)
---Type <return> to continue, or q <return> to quit---
    at pthread_create.c:463
#9  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fffe2dce700 (LWP 5172)):
#0  0x00007ffff2be2bf9 in __GI___poll (fds=0x7fffe2dcdb68, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffec7cd747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fffec7cf36a in xcb_wait_for_event ()
    at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fffe59ae578 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ffff32efc72 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffef97a6db in start_thread (arg=0x7fffe2dce700)
    at pthread_create.c:463
#6  0x00007ffff2bef88f in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffff7fade00 (LWP 5168)):
#0  0x0000000000000000 in  ()
#1  0x00007ffff4104215 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#2  0x00007fffd810c8ce in  ()
#3  0x0000000000000000 in  ()

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