Bug 423555

Summary: Reducing # of monitors causes kdeinit to core and login not to complete or hang.
Product: [I don't know] kde Reporter: whtenben
Component: generalAssignee: Unassigned bugs <unassigned-bugs-null>
Status: RESOLVED UNMAINTAINED    
Severity: normal    
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Other   
OS: Other   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description whtenben 2020-06-26 18:15:42 UTC 
SUMMARY
When reducing the monitors from 6 to 2, KDE would not complete login to the workspace after password had been completed.  Sound would load and then hang at the icons loading at the bottom left of the monitor.

STEPS TO REPRODUCE
1. Unplug 4 of the 6 monitors, leaving only 2
2. Reboot
3. Login with credentials

OBSERVED RESULT
The sound would notify and the speakers would notify of login.  However the screen would not complete the login to the workspace.  The icons loading in the lower left hand screen were stuck on the KDE icons.

EXPECTED RESULT
Login

SOFTWARE/OS VERSIONS

CentOS Linux release 7.7.1908 (Core)
kernel-3.10.0-1062.4.1.el7.x86_64  

Linux/KDE Plasma: 

(available in About System)
KDE Plasma Version: 4.10.5-5.el7
KDE Frameworks Version: 4.14.8-11.el7_7
Qt Version: 

ADDITIONAL INFORMATION

Good log:
6 monitor /var/log/messages -->

Jun 25 10:36:49 MYMACHINE org.kde.powerdevil.backlighthelper: no kernel backlight interface found
Jun 25 10:36:49 MYMACHINE dbus[1767]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 25 10:36:54 MYMACHINE NetworkManager[1801]: <info>  [1593099414.9926] agent-manager: req[0x564331135ad0, :1.36/org.kde.networkmanagement/0]: agent registered
Jun 25 10:36:59 MYMACHINE spice-vdagent[3617]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0
Jun 25 10:36:59 MYMACHINE systemd: Started PC/SC Smart Card Daemon.

Bad log:
2 monitor /var/log/messages -->

Jun 25 10:48:07 MYMACHINE org.kde.powerdevil.backlighthelper: no kernel backlight interface found
Jun 25 10:48:07 MYMACHINE dbus[1749]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 25 10:48:11 MYMACHINE abrt-hook-ccpp: Process 4588 (kdeinit4) of user 0 killed by SIGSEGV - dumping core
Jun 25 10:48:12 MYMACHINE kernel: plasma-desktop[4597]: segfault at 0 ip 00007f76f2c1785c sp 00007ffd6f2cd220 error 4 in plasma_applet_tasks.so[7f76f2c07000+1e000]
Jun 25 10:48:12 MYMACHINE abrt-hook-ccpp: Process 4597 (kdeinit4) of user 0 killed by SIGSEGV - ignoring (repeated crash)
Jun 25 10:48:13 MYMACHINE abrt-server: Generating core_backtrace
Jun 25 10:48:16 MYMACHINE abrt-server: Duplicate: core backtrace
Jun 25 10:48:16 MYMACHINE abrt-server: DUP_OF_DIR: /var/spool/abrt/ccpp-2020-06-24-10:57:10-3462
Jun 25 10:48:16 MYMACHINE abrt-server: Deleting problem directory ccpp-2020-06-25-10:48:11-4588 (dup of ccpp-2020-06-24-10:57:10-3462)
Jun 25 10:48:16 MYMACHINE dbus[1749]: [system] Activating service name='org.freedesktop.problems' (using servicehelper)
Jun 25 10:48:16 MYMACHINE dbus[1749]: [system] Successfully activated service 'org.freedesktop.problems'
Jun 25 10:48:22 MYMACHINE spice-vdagent[4688]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0
Jun 25 10:48:22 MYMACHINE systemd: Started PC/SC Smart Card Daemon.
Comment 1 whtenben 2020-06-26 18:16:44 UTC 
Troubleshooting:

# cd /var/spool/abrt
# cd ccpp-2020-06-25-14\:59\:19-3397/
# cat core_backtrace
{   "signal": 11
,   "executable": "/usr/bin/kdeinit4"
,   "stacktrace":
 
 
# eu-unstrip -n --core=./coredump
0x400000+0x20f000 a7227b2dcab83588117493d6efe2e99805f4c54a@0x400284 . /usr/lib/debug/usr/bin/kdeinit4.debug /usr/bin/kdeinit4
0x7ffd55b80000+0x1000 7f945b2385125e0b9a6c187543a8c96f8f9400c0@0x7ffd55b80328 . - linux-vdso.so.1
 
 
# yum install gdb elfutils
#  yum install colord-kde-debuginfo.x86_64 kde-baseapps-debuginfo.x86_64 kde-plasma-networkmanagement-debuginfo.x86_64 kde-print-manager-debuginfo.x86_64 kde-runtime-debuginfo.x86_64 kde-workspace-debuginfo.x86_64 kdeadmin-debuginfo.x86_64 kdeartwork-debuginfo.x86_64 kdegraphics-strigi-analyzer-debuginfo.x86_64 kdegraphics-thumbnailers-debuginfo.x86_64 kdelibs-debuginfo.x86_64 kdenetwork-debuginfo.x86_64 kdepim-debuginfo.x86_64 kdepim-runtime-debuginfo.x86_64 kdepimlibs-debuginfo.x86_64 kdeplasma-addons-debuginfo.x86_64 kdesdk-debuginfo.x86_64 libblockdev-debuginfo.x86_64 lockdev-debuginfo.x86_64 polkit-kde-debuginfo.x86_64 pykde4-debuginfo.x86_64 xsettings-kde-debuginfo.x86_64
 
# debuginfo-install OpenEXR-libs-1.7.1-7.el7.x86_64 akonadi-1.9.2-4.el7.x86_64 attica-0.4.2-1.el7.x86_64 bzip2-libs-1.0.6-13.el7.x86_64 compat-libical1-1.0.1-2.el7.x86_64 dbus-libs-1.10.24-13.el7_6.x86_64 dbusmenu-qt-0.9.2-7.el7.x86_64 elfutils-libelf-0.176-2.el7.x86_64 elfutils-libs-0.176-2.el7.x86_64 expat-2.1.0-10.el7_3.x86_64 flac-libs-1.3.0-5.el7_1.x86_64 fontconfig-2.13.0-4.3.el7.x86_64 freetype-2.8-14.el7.x86_64 gamin-0.1.10-16.el7.x86_64 glib2-2.56.1-5.el7.x86_64 glibc-2.17-292.el7.x86_64 gsm-1.0.13-11.el7.x86_64 ilmbase-1.0.3-7.el7.x86_64 jasper-libs-1.900.1-33.el7.x86_64 jbigkit-libs-2.0-11.el7.x86_64 kactivities-4.10.5-3.el7.x86_64 keyutils-libs-1.5.8-3.el7.x86_64 krb5-libs-1.15.1-37.el7_7.2.x86_64 libICE-1.0.9-9.el7.x86_64 libSM-1.2.2-2.el7.x86_64 libX11-1.6.7-2.el7.x86_64 libXScrnSaver-1.2.2-6.1.el7.x86_64 libXau-1.0.8-2.1.el7.x86_64 libXcomposite-0.4.4-4.1.el7.x86_64 libXcursor-1.1.15-1.el7.x86_64 libXdamage-1.1.4-4.1.el7.x86_64 libXdmcp-1.1.2-6.el7.x86_64 libXext-1.3.3-3.el7.x86_64 libXfixes-5.0.3-1.el7.x86_64 libXft-2.3.2-2.el7.x86_64 libXi-1.7.9-1.el7.x86_64 libXinerama-1.1.3-2.1.el7.x86_64 libXpm-3.5.12-1.el7.x86_64 libXrandr-1.5.1-2.el7.x86_64 libXrender-0.9.10-1.el7.x86_64 libXtst-1.2.3-1.el7.x86_64 libacl-2.2.51-14.el7.x86_64 libasyncns-0.8-7.el7.x86_64 libattr-2.4.46-13.el7.x86_64 libcap-2.22-10.el7.x86_64 libcom_err-1.42.9-16.el7.x86_64 libffi-3.0.13-18.el7.x86_64 libgcc-4.8.5-39.el7.x86_64 libgcrypt-1.5.3-14.el7.x86_64 libglvnd-1.0.1-0.8.git5baa1e5.el7.x86_64 libglvnd-glx-1.0.1-0.8.git5baa1e5.el7.x86_64 libgpg-error-1.12-3.el7.x86_64 libicu-50.2-3.el7.x86_64 libjpeg-turbo-1.2.90-8.el7.x86_64 libmng-1.0.10-14.el7.x86_64 libogg-1.3.0-7.el7.x86_64 libpng-1.5.13-7.el7_2.x86_64 libselinux-2.5-14.1.el7.x86_64 libsndfile-1.0.25-10.el7.x86_64 libstdc++-4.8.5-39.el7.x86_64 libtiff-4.0.3-32.el7.x86_64 libuuid-2.23.2-61.el7.x86_64 libvorbis-1.3.3-8.el7.1.x86_64 libxcb-1.13-1.el7.x86_64 libxml2-2.9.1-6.el7_2.3.x86_64 lz4-1.7.5-3.el7.x86_64 openssl-libs-1.0.2k-19.el7.x86_64 pcre-8.32-17.el7.x86_64 phonon-4.6.0-10.el7.x86_64 pulseaudio-libs-10.0-5.el7.x86_64 pulseaudio-libs-glib2-10.0-5.el7.x86_64 qca2-2.0.3-7.el7.x86_64 soprano-2.9.2-3.el7.x86_64 strigi-libs-0.7.7-13.20120626.el7.x86_64 systemd-libs-219-67.el7_7.2.x86_64 tcp_wrappers-libs-7.6-77.el7.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-18.el7.x86_64
 
 
# gdb -e /usr/bin/kdeinit4 -c coredump
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-115.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
 
warning: core file may not match specified executable file.
[New LWP 3462]
[New LWP 3463]
[New LWP 3465]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `kdeinit4: plasma-desktop [kdeinit]             '.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f1b76e254bb in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:36
36     return INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
(gdb) bt
#0  0x00007f1b76e254bb in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:36
#1  0x00007f1b7824b11f in KCrash::defaultCrashHandler(int) () from /lib64/libkdeui.so.5
#2  <signal handler called>
#3  0x00007f1b4b1ad85c in Tasks::init (this=0x10a3d50) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/applets/tasks/tasks.cpp:103
#4  0x00007f1b62b3491c in Plasma::ContainmentPrivate::initApplets() () from /usr/lib64/libplasma.so.3
#5  0x00007f1b62b418ac in Plasma::CoronaPrivate::importLayout(KConfigBase const&, bool) () from /usr/lib64/libplasma.so.3
#6  0x00007f1b62b422aa in Plasma::Corona::loadLayout(QString const&) () from /usr/lib64/libplasma.so.3
#7  0x00007f1b62b42364 in Plasma::Corona::initializeLayout(QString const&) () from /usr/lib64/libplasma.so.3
#8  0x00007f1b5d6a25c5 in PlasmaApp::corona (this=this@entry=0xcd74c0, createIfMissing=createIfMissing@entry=true)
    at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/plasmaapp.cpp:856
#9  0x00007f1b5d6a2c21 in PlasmaApp::setupDesktop (this=0xcd74c0) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/plasmaapp.cpp:314
#10 0x00007f1b5d6a7275 in PlasmaApp::qt_static_metacall (_o=0xcd74c0, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>)
    at /usr/src/debug/kde-workspace-4.11.19/x86_64-redhat-linux-gnu/plasma/desktop/shell/plasmaapp.moc:128
#11 0x00007f1b771d185e in QObject::event (this=this@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qobject.cpp:1222
#12 0x00007f1b771bce9c in QCoreApplication::event (this=this@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qcoreapplication.cpp:1767
#13 0x00007f1b763002d3 in QApplication::event (this=0xcd74c0, e=0xe12780) at kernel/qapplication.cpp:2544
#14 0x00007f1b762fb04c in QApplicationPrivate::notify_helper (this=this@entry=0xcf9410, receiver=receiver@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qapplication.cpp:4568
#15 0x00007f1b76301925 in QApplication::notify (this=0xcd74c0, receiver=0xcd74c0, e=0xe12780) at kernel/qapplication.cpp:4354
#16 0x00007f1b781eea6a in KApplication::notify(QObject*, QEvent*) () from /lib64/libkdeui.so.5
#17 0x00007f1b771b883d in QCoreApplication::notifyInternal (this=0xcd74c0, receiver=receiver@entry=0xcd74c0, event=event@entry=0xe12780) at kernel/qcoreapplication.cpp:955
#18 0x00007f1b771bba25 in sendEvent (event=0xe12780, receiver=0xcd74c0) at kernel/qcoreapplication.h:231
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0xc210a0) at kernel/qcoreapplication.cpp:1579
#20 0x00007f1b771bbec3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1472
#21 0x00007f1b771e7bee in sendPostedEvents () at kernel/qcoreapplication.h:236
#22 postEventSourceDispatch (s=0xcedc60) at kernel/qeventdispatcher_glib.cpp:300
#23 0x00007f1b71ae4099 in g_main_dispatch (context=0xcedba0) at gmain.c:3175
#24 g_main_context_dispatch (context=context@entry=0xcedba0) at gmain.c:3828
#25 0x00007f1b71ae43f8 in g_main_context_iterate (context=context@entry=0xcedba0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3901
#26 0x00007f1b71ae44ac in g_main_context_iteration (context=0xcedba0, may_block=1) at gmain.c:3962
#27 0x00007f1b771e736e in QEventDispatcherGlib::processEvents (this=0xcd8a00, flags=...) at kernel/qeventdispatcher_glib.cpp:450
#28 0x00007f1b763a0016 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
#29 0x00007f1b771b72cf in QEventLoop::processEvents (this=this@entry=0x7fff45de0f50, flags=...) at kernel/qeventloop.cpp:149
#30 0x00007f1b771b761d in QEventLoop::exec (this=this@entry=0x7fff45de0f50, flags=...) at kernel/qeventloop.cpp:204
#31 0x00007f1b771bcce9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1227
#32 0x00007f1b762f953c in QApplication::exec () at kernel/qapplication.cpp:3826
#33 0x00007f1b5d68c894 in kdemain (argc=1, argv=0xc22580) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/main.cpp:126
#34 0x0000000000407f00 in ?? ()
#35 0x0000000000000006 in ?? ()
#36 0x00007fff45de1200 in ?? ()
#37 0x00007fff45de11e0 in ?? ()
#38 0x00007fff45de1300 in ?? ()
#39 0x00007fff45de13a0 in ?? ()
#40 0x00007fff45de1280 in ?? ()
#41 0x00007fff45de1202 in ?? ()
#42 0x00007fff45de1190 in ?? ()
#43 0x0000000000c69b78 in ?? ()
#44 0x00007fff45de11a0 in ?? ()
#45 0x0000000000000000 in ?? ()
(gdb) bt full
#0  0x00007f1b76e254bb in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:36
        resultvar = 0
        pid = <optimized out>
#1  0x00007f1b7824b11f in KCrash::defaultCrashHandler(int) () from /lib64/libkdeui.so.5
No symbol table info available.
#2  <signal handler called>
No locals.
#3  0x00007f1b4b1ad85c in Tasks::init (this=0x10a3d50) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/applets/tasks/tasks.cpp:103
        c = 0x10f4310
        rootContext = 0x1a89060
        structure = {d = 0x7f1b77c58410 <vtable for KConfigBase+16>}
        layout = <optimized out>
        optimumCapacity = {d = 0x1a88f00}
        package = <optimized out>
        preferredWidth = {d = 0x60c658}
        preferredHeight = {d = 0x18a3500}
#4  0x00007f1b62b3491c in Plasma::ContainmentPrivate::initApplets() () from /usr/lib64/libplasma.so.3
No symbol table info available.
#5  0x00007f1b62b418ac in Plasma::CoronaPrivate::importLayout(KConfigBase const&, bool) () from /usr/lib64/libplasma.so.3
No symbol table info available.
#6  0x00007f1b62b422aa in Plasma::Corona::loadLayout(QString const&) () from /usr/lib64/libplasma.so.3
No symbol table info available.
#7  0x00007f1b62b42364 in Plasma::Corona::initializeLayout(QString const&) () from /usr/lib64/libplasma.so.3
No symbol table info available.
#8  0x00007f1b5d6a25c5 in PlasmaApp::corona (this=this@entry=0xcd74c0, createIfMissing=createIfMissing@entry=true)
    at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/plasmaapp.cpp:856
        t = {mds = 39427344}
        c = 0xe13280
        activityAction = 0xe81690
        __PRETTY_FUNCTION__ = "DesktopCorona* PlasmaApp::corona(bool)"
#9  0x00007f1b5d6a2c21 in PlasmaApp::setupDesktop (this=0xcd74c0) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/plasmaapp.cpp:314
        atomNames = {0x7f1b5d6b9584 "XdndAware", 0x7f1b5d6b958e "XdndEnter", 0x7f1b5d6b9598 "XdndFinished", 0x7f1b5d6b95a5 "XdndPosition", 0x7f1b5d6b95b2 "XdndStatus"}
        theme = <optimized out>
        screens = <optimized out>
        palette = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f1b769e66a0 <qt_meta_stringdata_QPalette> "QPalette", data = 0x7f1b769e67e0 <qt_meta_data_QPalette>,
              extradata = 0x0}}, d = 0xc445e0, current_group = 15, resolve_mask = 55}
        __PRETTY_FUNCTION__ = "void PlasmaApp::setupDesktop()"
        atoms = {399, 390, 395, 391, 392}
#10 0x00007f1b5d6a7275 in PlasmaApp::qt_static_metacall (_o=0xcd74c0, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>)
    at /usr/src/debug/kde-workspace-4.11.19/x86_64-redhat-linux-gnu/plasma/desktop/shell/plasmaapp.moc:128
        _t = 0xcd74c0
#11 0x00007f1b771d185e in QObject::event (this=this@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qobject.cpp:1222
        mce = 0xe12780
        currentSender = {sender = 0x0, signal = -1, ref = 1}
        previousSender = 0x0
#12 0x00007f1b771bce9c in QCoreApplication::event (this=this@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qcoreapplication.cpp:1767
No locals.
#13 0x00007f1b763002d3 in QApplication::event (this=0xcd74c0, e=0xe12780) at kernel/qapplication.cpp:2544
        d = <optimized out>
#14 0x00007f1b762fb04c in QApplicationPrivate::notify_helper (this=this@entry=0xcf9410, receiver=receiver@entry=0xcd74c0, e=e@entry=0xe12780) at kernel/qapplication.cpp:4568
        consumed = <optimized out>
#15 0x00007f1b76301925 in QApplication::notify (this=0xcd74c0, receiver=0xcd74c0, e=0xe12780) at kernel/qapplication.cpp:4354
        w = 0xcd74c0
        extra = <optimized out>
        isProxyWidget = <optimized out>
---Type <return> to continue, or q <return> to quit---
        d = 0xcf9410
        res = false
#16 0x00007f1b781eea6a in KApplication::notify(QObject*, QEvent*) () from /lib64/libkdeui.so.5
No symbol table info available.
#17 0x00007f1b771b883d in QCoreApplication::notifyInternal (this=0xcd74c0, receiver=receiver@entry=0xcd74c0, event=event@entry=0xe12780) at kernel/qcoreapplication.cpp:955
        threadData = 0xc210a0
        returnValue = <optimized out>
        result = false
        cbdata = {0xcd74c0, 0xe12780, 0x7fff45de0c2f}
        d = <optimized out>
#18 0x00007f1b771bba25 in sendEvent (event=0xe12780, receiver=0xcd74c0) at kernel/qcoreapplication.h:231
No locals.
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0xc210a0) at kernel/qcoreapplication.cpp:1579
        pe = @0xe132d0: {receiver = 0xcd74c0, event = 0x0, priority = 0}
        e = 0xe12780
        r = 0xcd74c0
        locker = {val = 12718312}
        startOffset = 0
        i = @0xc210dc: 14
#20 0x00007f1b771bbec3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1472
        data = <optimized out>
#21 0x00007f1b771e7bee in sendPostedEvents () at kernel/qcoreapplication.h:236
No locals.
#22 postEventSourceDispatch (s=0xcedc60) at kernel/qeventdispatcher_glib.cpp:300
        s = 0xcedc60
#23 0x00007f1b71ae4099 in g_main_dispatch (context=0xcedba0) at gmain.c:3175
        dispatch = 0x7f1b771e7bd0 <postEventSourceDispatch(GSource*, GSourceFunc, gpointer)>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x0
        callback = 0x0
        cb_funcs = 0x0
        cb_data = 0x0
        need_destroy = <optimized out>
        source = 0xcedc60
        current = 0xc1e390
        i = 0
#24 g_main_context_dispatch (context=context@entry=0xcedba0) at gmain.c:3828
No locals.
#25 0x00007f1b71ae43f8 in g_main_context_iterate (context=context@entry=0xcedba0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3901
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 4
        fds = 0xdf23c0
#26 0x00007f1b71ae44ac in g_main_context_iteration (context=0xcedba0, may_block=1) at gmain.c:3962
        retval = <optimized out>
#27 0x00007f1b771e736e in QEventDispatcherGlib::processEvents (this=0xcd8a00, flags=...) at kernel/qeventdispatcher_glib.cpp:450
        d = 0xc23620
        canWait = <optimized out>
        savedFlags = {i = 0}
        result = <optimized out>
#28 0x00007f1b763a0016 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
        d = 0xc23620
---Type <return> to continue, or q <return> to quit---
        saved_flags = {i = 0}
        returnValue = <optimized out>
#29 0x00007f1b771b72cf in QEventLoop::processEvents (this=this@entry=0x7fff45de0f50, flags=...) at kernel/qeventloop.cpp:149
        d = 0xe12890
#30 0x00007f1b771b761d in QEventLoop::exec (this=this@entry=0x7fff45de0f50, flags=...) at kernel/qeventloop.cpp:204
        d = 0xe12890
        locker = {val = 12718552}
#31 0x00007f1b771bcce9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1227
        threadData = 0xc210a0
        eventLoop = {<QObject> = {_vptr.QObject = 0x7f1b7751c710 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0,
                stringdata = 0x7f1b77299380 <qt_meta_stringdata_QObject> "QObject", data = 0x7f1b77299420 <qt_meta_data_QObject>,
                extradata = 0x7f1b77519c60 <QObject::staticMetaObjectExtraData>}}, static staticMetaObjectExtraData = {objects = 0x0,
              static_metacall = 0x7f1b771d2740 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>}, d_ptr = {d = 0xe12890}, static staticQtMetaObject = {d = {
                superdata = 0x0, stringdata = 0x7f1b772a22c0 <qt_meta_stringdata_Qt> "Qt", data = 0x7f1b772a5be0 <qt_meta_data_Qt>, extradata = 0x0}}}, static staticMetaObject = {d = {
              superdata = 0x7f1b77519c40 <QObject::staticMetaObject>, stringdata = 0x7f1b772abea0 <qt_meta_stringdata_QEventLoop> "QEventLoop",
              data = 0x7f1b772abec0 <qt_meta_data_QEventLoop>, extradata = 0x7f1b7751c7a0 <QEventLoop::staticMetaObjectExtraData>}}, static staticMetaObjectExtraData = {objects = 0x0,
            static_metacall = 0x7f1b7721a460 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>}}
        returnCode = <optimized out>
#32 0x00007f1b762f953c in QApplication::exec () at kernel/qapplication.cpp:3826
No locals.
#33 0x00007f1b5d68c894 in kdemain (argc=1, argv=0xc22580) at /usr/src/debug/kde-workspace-4.11.19/plasma/desktop/shell/main.cpp:126
        __PRETTY_FUNCTION__ = "int kdemain(int, char**)"
        associatedScreen = <optimized out>
        aboutData = {d = 0xcdf320}
        app = 0xcd74c0
        appName = {static shared_null = {ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x60c638 "", array = ""}, static shared_empty = {ref = {_q_value = 189}, alloc = 0, size = 0,
            data = 0x7f1b7751e778 <QByteArray::shared_empty+24> "", array = ""}, d = 0xcb4a70}
        rc = <optimized out>
#34 0x0000000000407f00 in ?? ()
No symbol table info available.
#35 0x0000000000000006 in ?? ()
No symbol table info available.
#36 0x00007fff45de1200 in ?? ()
No symbol table info available.
#37 0x00007fff45de11e0 in ?? ()
No symbol table info available.
#38 0x00007fff45de1300 in ?? ()
No symbol table info available.
#39 0x00007fff45de13a0 in ?? ()
No symbol table info available.
#40 0x00007fff45de1280 in ?? ()
No symbol table info available.
#41 0x00007fff45de1202 in ?? ()
No symbol table info available.
#42 0x00007fff45de1190 in ?? ()
No symbol table info available.
#43 0x0000000000c69b78 in ?? ()
No symbol table info available.
#44 0x00007fff45de11a0 in ?? ()
No symbol table info available.
#45 0x0000000000000000 in ?? ()
No symbol table info available.
(gdb)
Comment 2 whtenben 2020-06-26 18:19:12 UTC 
Solution:

Removed this file: ~/.kde/share/config/plasma-desktop-appletsrc


Here is the plasma-desktop-appletsrc file that would prevent 2 monitor from completing the kde login process and also cause kdeinit to core dump.
 
# cat plasma-desktop-appletsrc
[ActionPlugins]
MidButton;NoModifier=paste
RightButton;NoModifier=contextmenu
wheel:Vertical;NoModifier=switchdesktop
 
[AppletGlobals][plasma_applet_launcher]
brasero=
ca.desrt.dconf-editor=
emacs=
emacsclient=
esc=
firefox=
firewall-config=
gimp=
gnome-abrt=
gvim=
htop=
java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64-policytool=
kde4-Help=
kde4-Home=
kde4-KCharSelect=
kde4-akonaditray=
kde4-akregator=
kde4-ark=
kde4-bluedevil-monolithic=
kde4-dolphin=
kde4-gwenview=
kde4-kaddressbook=
kde4-kalarm=
kde4-kate=
kde4-kcalc=
kde4-kcolorchooser=
kde4-kdf=
kde4-kfind=
kde4-kget=
kde4-kgpg=
kde4-kinfocenter=
kde4-kleopatra=
kde4-klipper=
kde4-kmag=
kde4-kmix=
kde4-knetattach=
kde4-knotes=
kde4-konqbrowser=
kde4-konsole=
kde4-korganizer=
kde4-krfb=
kde4-kruler=
kde4-ksnapshot=
kde4-ksshaskpass=
kde4-ksysguard=
kde4-ksystemlog=
kde4-ktimer=
kde4-ktimetracker=
kde4-kuser=
kde4-kwalletmanager=
kde4-kwikdisk=
kde4-kwrite=
kde4-nepomukbackup=
kde4-nepomukcleaner=
kde4-nepomukcontroller=
kde4-okular=
kde4-sweeper=
kde4-systemsettings=
libreoffice-base=
libreoffice-calc=
libreoffice-draw=
libreoffice-impress=
libreoffice-writer=
nvidia-settings=
obconf-qt=
org.gnome.ColorProfileViewer=
org.gnome.DiskUtility=
org.gnome.GPaste.Ui=
org.gnome.Nautilus=
org.gnome.Terminal=
org.gnome.clocks=
org.gnome.font-viewer=
qt4-assistant=
qt4-designer=
qt4-linguist=
setroubleshoot=
system-config-date=
vncviewer=
wireshark=
x11vnc=
xterm=
 
[Containments][1]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-41,3840,35
immutability=1
lastDesktop=-1
lastScreen=0
location=4
plugin=panel
screen=0
zvalue=0
 
[Containments][1][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][1][Applets][2]
geometry=0,3,32,32
immutability=1
plugin=launcher
zvalue=0
 
[Containments][1][Applets][2][Configuration]
icon=system-logo-icon
 
[Containments][1][Applets][2][LayoutInformation]
Order=0
 
[Containments][1][Applets][3]
geometry=36,3,32,32
immutability=1
plugin=org.kde.showActivityManager
zvalue=0
 
[Containments][1][Applets][3][LayoutInformation]
Order=1
 
[Containments][1][Applets][4]
geometry=72,3,0,32
immutability=1
plugin=pager
zvalue=0
 
[Containments][1][Applets][4][Configuration]
hideWhenSingleDesktop=true
 
[Containments][1][Applets][4][LayoutInformation]
Order=2
 
[Containments][1][Applets][5]
geometry=76,3,3562,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][1][Applets][5][LayoutInformation]
Order=3
 
[Containments][1][Applets][6]
geometry=3642,3,106,32
immutability=1
plugin=systemtray
zvalue=0
 
[Containments][1][Applets][6][Configuration]
DefaultAppletsAdded=true
 
[Containments][1][Applets][6][Configuration][Applets][1]
geometry=0,0,24,24
immutability=1
plugin=printmanager
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][2]
geometry=0,0,24,24
immutability=1
plugin=org.kde.networkmanagement
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][2][PopupApplet]
DialogHeight=216
DialogWidth=570
 
[Containments][1][Applets][6][Configuration][Applets][24]
plugin=notifications
 
[Containments][1][Applets][6][Configuration][Applets][30]
geometry=0,0,24,24
immutability=1
plugin=notifier
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][31]
geometry=0,0,24,24
immutability=1
plugin=org.kde.notifications
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][31][PopupApplet]
DialogHeight=108
DialogWidth=412
 
[Containments][1][Applets][6][Configuration][Shortcuts]
SystemTray-Klipper-6=Ctrl+Alt+V
 
[Containments][1][Applets][6][LayoutInformation]
Order=4
 
[Containments][1][Applets][7]
geometry=3752,3,64,32
immutability=1
plugin=digital-clock
zvalue=0
 
[Containments][1][Applets][7][LayoutInformation]
Order=5
 
[Containments][1][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][10]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-117,3840,35
immutability=1
lastDesktop=-1
lastScreen=1
location=4
plugin=panel
screen=1
zvalue=0
 
[Containments][10][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][10][Applets][11]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][10][Applets][11][Configuration]
showOnlyCurrentScreen=true
 
[Containments][10][Applets][11][LayoutInformation]
Order=0
 
[Containments][10][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][12]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=0,2316,3840,2160
immutability=1
lastDesktop=-1
lastScreen=2
location=0
plugin=desktop
screen=2
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][12][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
 
[Containments][13]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-193,3840,35
immutability=1
lastDesktop=-1
lastScreen=2
location=4
plugin=panel
screen=2
zvalue=0
 
[Containments][13][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][13][Applets][14]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][13][Applets][14][Configuration]
showOnlyCurrentScreen=true
 
[Containments][13][Applets][14][LayoutInformation]
Order=0
 
[Containments][13][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][15]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=3846,2316,3840,2160
immutability=1
lastDesktop=-1
lastScreen=3
location=0
plugin=desktop
screen=3
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][15][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
 
[Containments][16]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-269,3840,35
immutability=1
lastDesktop=-1
lastScreen=3
location=4
plugin=panel
screen=3
zvalue=0
 
[Containments][16][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][16][Applets][17]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][16][Applets][17][Configuration]
showOnlyCurrentScreen=true
 
[Containments][16][Applets][17][LayoutInformation]
Order=0
 
[Containments][16][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][18]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=0,4632,3840,2160
immutability=1
lastDesktop=-1
lastScreen=4
location=0
plugin=desktop
screen=4
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][18][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
 
[Containments][19]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-345,3840,35
immutability=1
lastDesktop=-1
lastScreen=4
location=4
plugin=panel
screen=4
zvalue=0
 
[Containments][19][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][19][Applets][20]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][19][Applets][20][Configuration]
showOnlyCurrentScreen=true
 
[Containments][19][Applets][20][LayoutInformation]
Order=0
 
[Containments][19][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][21]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=3846,4632,3840,2160
immutability=1
lastDesktop=-1
lastScreen=5
location=0
plugin=desktop
screen=5
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][21][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
 
[Containments][22]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-421,3840,35
immutability=1
lastDesktop=-1
lastScreen=5
location=4
plugin=panel
screen=5
zvalue=0
 
[Containments][22][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][22][Applets][23]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][22][Applets][23][Configuration]
showOnlyCurrentScreen=true
 
[Containments][22][Applets][23][LayoutInformation]
Order=0
 
[Containments][22][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][24]
ActionPluginsSource=Global
activity=New Activity
activityId=5a0d4852-5bb4-46ef-a1b2-43337f2cef4d
desktop=-1
formfactor=0
geometry=0,6948,3840,2160
immutability=1
lastDesktop=-1
lastScreen=0
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][25]
ActionPluginsSource=Global
activity=New Activity
activityId=8d68aa8c-2c51-4a19-841a-28f8ea953712
desktop=-1
formfactor=0
geometry=3846,6948,3840,2160
immutability=1
lastDesktop=-1
lastScreen=1
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][26]
ActionPluginsSource=Global
activity=New Activity
activityId=7ea252d5-bc18-4ebf-acd6-85248ed6a9dc
desktop=-1
formfactor=0
geometry=0,9264,3840,2160
immutability=1
lastDesktop=-1
lastScreen=2
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][27]
ActionPluginsSource=Global
activity=New Activity
activityId=6560d6d2-1f94-4603-a6a4-564dd5e39feb
desktop=-1
formfactor=0
geometry=3846,9264,3840,2160
immutability=1
lastDesktop=-1
lastScreen=3
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][28]
ActionPluginsSource=Global
activity=New Activity
activityId=1f0140c4-56ce-4fa9-8e79-2219af9bff27
desktop=-1
formfactor=0
geometry=0,11580,3840,2160
immutability=1
lastDesktop=-1
lastScreen=4
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][29]
ActionPluginsSource=Global
activity=New Activity
activityId=84a25bdc-b202-479c-9ad3-9d1be1acb8c5
desktop=-1
formfactor=0
geometry=3846,11580,3840,2160
immutability=1
lastDesktop=-1
lastScreen=5
location=0
plugin=desktop
screen=-1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][8]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=0,0,3840,2160
immutability=1
lastDesktop=-1
lastScreen=0
location=0
plugin=desktop
screen=0
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][8][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
 
[Containments][9]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=3846,0,3840,2160
immutability=1
lastDesktop=-1
lastScreen=1
location=0
plugin=desktop
screen=1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][9][Wallpaper][image]
slideTimer=10
slidepaths=
userswallpapers=
wallpaper=/usr/share/wallpapers/CentOS7
wallpapercolor=0,0,0
wallpaperposition=0
Comment 3 whtenben 2020-06-26 18:20:02 UTC 
Here is the config file that was re-generated that allowed the login to complete.

# cat plasma-desktop-appletsrc
[ActionPlugins]
MidButton;NoModifier=paste
RightButton;NoModifier=contextmenu
wheel:Vertical;NoModifier=switchdesktop
 
[AppletGlobals][plasma_applet_launcher]
brasero=
ca.desrt.dconf-editor=
emacs=
emacsclient=
esc=
firefox=
firewall-config=
gimp=
gnome-abrt=
gvim=
htop=
java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64-policytool=
kde4-Help=
kde4-Home=
kde4-KCharSelect=
kde4-akonaditray=
kde4-akregator=
kde4-ark=
kde4-bluedevil-monolithic=
kde4-dolphin=
kde4-gwenview=
kde4-kaddressbook=
kde4-kalarm=
kde4-kate=
kde4-kcalc=
kde4-kcolorchooser=
kde4-kdf=
kde4-kfind=
kde4-kget=
kde4-kgpg=
kde4-kinfocenter=
kde4-kleopatra=
kde4-klipper=
kde4-kmag=
kde4-kmix=
kde4-knetattach=
kde4-knotes=
kde4-konqbrowser=
kde4-konsole=
kde4-korganizer=
kde4-krfb=
kde4-kruler=
kde4-ksnapshot=
kde4-ksshaskpass=
kde4-ksysguard=
kde4-ksystemlog=
kde4-ktimer=
kde4-ktimetracker=
kde4-kuser=
kde4-kwalletmanager=
kde4-kwikdisk=
kde4-kwrite=
kde4-nepomukbackup=
kde4-nepomukcleaner=
kde4-nepomukcontroller=
kde4-okular=
kde4-sweeper=
kde4-systemsettings=
libreoffice-base=
libreoffice-calc=
libreoffice-draw=
libreoffice-impress=
libreoffice-writer=
nvidia-settings=
obconf-qt=
org.gnome.ColorProfileViewer=
org.gnome.DiskUtility=
org.gnome.GPaste.Ui=
org.gnome.Nautilus=
org.gnome.Terminal=
org.gnome.clocks=
org.gnome.font-viewer=
qt4-assistant=
qt4-designer=
qt4-linguist=
setroubleshoot=
system-config-date=
vncviewer=
wireshark=
x11vnc=
xterm=
 
[Containments][1]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-41,3840,35
immutability=1
lastDesktop=-1
lastScreen=0
location=4
plugin=panel
screen=0
zvalue=0
 
[Containments][1][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][1][Applets][2]
geometry=0,3,32,32
immutability=1
plugin=launcher
zvalue=0
 
[Containments][1][Applets][2][LayoutInformation]
Order=0
 
[Containments][1][Applets][3]
geometry=36,3,32,32
immutability=1
plugin=org.kde.showActivityManager
zvalue=0
 
[Containments][1][Applets][3][LayoutInformation]
Order=1
 
[Containments][1][Applets][4]
geometry=72,3,0,32
immutability=1
plugin=pager
zvalue=0
 
[Containments][1][Applets][4][Configuration]
hideWhenSingleDesktop=true
 
[Containments][1][Applets][4][LayoutInformation]
Order=2
 
[Containments][1][Applets][5]
geometry=76,3,3534,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][1][Applets][5][LayoutInformation]
Order=3
 
[Containments][1][Applets][6]
geometry=3614,3,134,32
immutability=1
plugin=systemtray
zvalue=0
 
[Containments][1][Applets][6][Configuration]
DefaultAppletsAdded=true
 
[Containments][1][Applets][6][Configuration][Applets][1]
geometry=0,0,24,24
immutability=1
plugin=printmanager
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][12]
geometry=0,0,24,24
immutability=1
plugin=org.kde.networkmanagement
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][12][PopupApplet]
DialogHeight=328
DialogWidth=570
 
[Containments][1][Applets][6][Configuration][Applets][13]
geometry=0,0,24,24
immutability=1
plugin=notifier
zvalue=0
 
[Containments][1][Applets][6][Configuration][Applets][14]
geometry=0,0,24,24
immutability=1
plugin=org.kde.notifications
zvalue=0
 
[Containments][1][Applets][6][Configuration][Shortcuts]
SystemTray-Klipper-6=Ctrl+Alt+V
 
[Containments][1][Applets][6][LayoutInformation]
Order=4
 
[Containments][1][Applets][7]
geometry=3752,3,64,32
immutability=1
plugin=digital-clock
zvalue=0
 
[Containments][1][Applets][7][LayoutInformation]
Order=5
 
[Containments][1][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][10]
activity=
activityId=
desktop=-1
formfactor=2
geometry=0,-117,3840,35
immutability=1
lastDesktop=-1
lastScreen=1
location=4
plugin=panel
screen=1
zvalue=0
 
[Containments][10][ActionPlugins]
RightButton;NoModifier=contextmenu
 
[Containments][10][Applets][11]
geometry=0,3,3816,32
immutability=1
plugin=tasks
zvalue=0
 
[Containments][10][Applets][11][Configuration]
showOnlyCurrentScreen=true
 
[Containments][10][Applets][11][LayoutInformation]
Order=0
 
[Containments][10][Configuration]
maximumSize=3840,35
minimumSize=3840,35
 
[Containments][8]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=0,0,3840,2160
immutability=1
lastDesktop=-1
lastScreen=0
location=0
plugin=desktop
screen=0
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
 
[Containments][9]
ActionPluginsSource=Global
activity=Desktop
activityId=1c316c68-ef7a-4773-adae-5a088a60856f
desktop=-1
formfactor=0
geometry=3846,0,3840,2160
immutability=1
lastDesktop=-1
lastScreen=1
location=0
plugin=desktop
screen=1
wallpaperplugin=image
wallpaperpluginmode=SingleImage
zvalue=0
Comment 4 whtenben 2020-06-26 18:24:14 UTC 
The work around at this time is to remove the below file.  However, the login process should recognize that the # of screens changed and the configs should be adjusted for this scenario.

~/.kde/share/config/plasma-desktop-appletsrc
Comment 5 Christoph Feck 2020-07-14 21:50:53 UTC 
KDE4 is long unmaintained. Please update to Plasma 5.18 or newer.