kde-plasma/sddm-kcm crashes when activated [SOLVED]

[KShots]

Only debugging I seem to be getting is:

Code: Select all

rich@graendalwired ~ $ systemsettings5 
QDBusArgument: read from a write-only object
Aborted

This is with kde-plasma/sddm-kcm-5.6.5 and kde-plasma/plasma-meta-5.6.5.

Steps to crash: go into Workspace->Startup and Shutdown->SDDM
...
crash

EDIT: Bug posted

EDIT2: Apparently the below items are deemed as duplicate issues. I couldn't find any relation between them beyond that they were all new plasma 5.6.5 issues, but apparently they've been deemed to have the same root cause by the moderators (who are likely understandably perturbed that multiple threads popped up from the same user on different problems). So, here's some other stuff that's not working that shouldn't have anything to do with sddm-kcm...:

• systemsettings5's Date & Time settings under Regional Settings also crashes the systemsettings GUI with the following output:

  Code: Select all

  rich@graendalwired ~ $ systemsettings5 
  QDBusConnection: warning: blocking call took a long time (1489 ms, max for this thread is 200 ms) to service "org.kde.kded5" path "/modules/ktimezoned" interface "org.freedesktop.DBus.Introspectable" member "Introspect" 
  QDBusConnection: warning: blocking call took a long time (1630 ms, max for this thread is 200 ms) to service "org.kde.kded5" path "/modules/ktimezoned" interface "org.kde.KTimeZoned" member "initialize" 
  KSystemTimeZones: ktimezoned initialize() D-Bus call failed:  "Message recipient disconnected from message bus without replying" 
  
  QDBusArgument: read from a write-only object 
  Aborted

• systemsettings5's Account Details function simply crashes the GUI with the following output:

  Code: Select all

  rich@graendalwired ~ $ systemsettings5 
  QDBusArgument: read from a write-only object
  Aborted

[KShots]

Cannot configure background services - appears to time out and state "Unable to contact KDED" after upgrading to plasma 5.6.5. This is the case both with existing users and newly created users (to rule out old config settings).

To get to this point, open systemsettings5, click on Startup and Shutdown, then on Background Services. You will get a short timeout followed by the error message. As a side effect, this prevents the user from configuring and power management options...

[asturm]

At this point it should be clear you have a problem well below random Plasma modules.

Code: Select all

$ emerge --info
$ emerge -uvDNp world
$ equery l -i dev-qt/*
# rc-update show

[KShots]

emerge --info:

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graendalwired libkscreen # emerge --info
Portage 2.2.28 (python 3.4.3-final-0, default/linux/amd64/13.0/desktop/plasma/systemd, gcc-4.9.3, glibc-2.22-r4, 4.4.6-gentoo x86_64)
=================================================================
System uname: Linux-4.4.6-gentoo-x86_64-Intel-R-_Core-TM-_i7-6700HQ_CPU_@_2.60GHz-with-gentoo-2.2
KiB Mem:    16303092 total,  10875836 free
KiB Swap:    8899580 total,   8899580 free
Timestamp of repository gentoo: Tue, 26 Jul 2016 16:30:01 +0000
sh bash 4.3_p42-r1
ld GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
app-shells/bash:          4.3_p42-r1::gentoo
dev-java/java-config:     2.2.0-r3::gentoo
dev-lang/perl:            5.20.2::gentoo
dev-lang/python:          2.7.10-r1::gentoo, 3.4.3-r1::gentoo
dev-util/cmake:           3.3.1-r1::gentoo
dev-util/pkgconfig:       0.28-r2::gentoo
sys-apps/baselayout:      2.2::gentoo
sys-apps/openrc:          0.19.1::gentoo
sys-apps/sandbox:         2.10-r1::gentoo
sys-devel/autoconf:       2.13::gentoo, 2.69::gentoo
sys-devel/automake:       1.11.6-r1::gentoo, 1.13.4::gentoo, 1.14.1::gentoo, 1.15::gentoo
sys-devel/binutils:       2.25.1-r1::gentoo
sys-devel/gcc:            4.9.3::gentoo
sys-devel/gcc-config:     1.7.3::gentoo
sys-devel/libtool:        2.4.6::gentoo
sys-devel/make:           4.1-r1::gentoo
sys-kernel/linux-headers: 4.3::gentoo (virtual/os-headers)
sys-libs/glibc:           2.22-r4::gentoo
Repositories:

gentoo
    location: /usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000

axs
    location: /var/lib/layman/axs
    sync-type: laymansync
    sync-uri: git://anongit.gentoo.org/dev/axs.git
    masters: gentoo
    priority: 50

qt
    location: /var/lib/layman/qt
    sync-type: laymansync
    sync-uri: git://anongit.gentoo.org/proj/qt.git
    masters: gentoo
    priority: 50

steam-overlay
    location: /var/lib/layman/steam-overlay
    sync-type: laymansync
    sync-uri: git://github.com/anyc/steam-overlay.git
    masters: gentoo
    priority: 50

local
    location: /usr/local/portage
    masters: gentoo
    priority: 51

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -march=core-avx2"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -pipe -march=core-avx2"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j9"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="X a52 aac aalib acl acpi alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr cli corefonts cracklib crypt cups cxx dbus declarative dri dts dvb dvd dvdr egl emboss encode exif faad fam firefox flac fortran gdbm gif glamor gles1 gles2 gnome-keyring gpm gssapi gstreamer gtk hidpi iconv ipv6 java jpeg kde kerberos kipi lcms ldap libnotify lm_sensors mad mmx mmxext mng modules mono mp3 mp4 mpeg multilib ncurses networkmanager nls nptl ogg opengl openmp pam pango pch pcre pdf perl phonon plasma png policykit ppds pulseaudio python qml qt3support qt4 qt5 readline sdl seccomp semantic-desktop session spell sse sse2 ssl startup-notification svg systemd tcpd tiff truetype udev udisks unicode upower usb vaapi vdpau vim-syntax vorbis webkit widgets wxwidgets x264 xattr xcb xcomposite xinerama xml xscreensaver xv xvid zlib" ABI_X86="32 64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev synaptics" KERNEL="linux" L10N="en en-US" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en en_US" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby20 ruby21" USERLAND="GNU" VIDEO_CARDS="i965 intel nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON

emerge -uvDNp world

Code: Select all

graendalwired libkscreen # emerge -uvDNp world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] kde-plasma/sddm-kcm-5.6.5:5::gentoo  USE="-debug*" 0 KiB

Total: 1 package (1 reinstall), Size of downloads: 0 KiB

(note - I re-compiled sddm-kcm with debug enabled in the hopes it would emit more useful errors... it did not.

equery l -i dev-qt/*

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rich@graendalwired /etc/portage $ equery l -i dev-qt/*
 * Searching for * in dev-qt ...
[IP-] [  ] dev-qt/assistant-4.8.6-r1:4
[IP-] [  ] dev-qt/designer-4.8.6-r1:4
[IP-] [  ] dev-qt/designer-5.6.1:5/5.6
[IP-] [  ] dev-qt/linguist-tools-5.6.1:5/5.6
[IP-] [  ] dev-qt/qdbus-5.6.1:5/5.6
[IP-] [  ] dev-qt/qt-creator-4.0.3:0
[IP-] [  ] dev-qt/qt3support-4.8.6-r1:4
[IP-] [  ] dev-qt/qtchooser-0_p20151008:0
[IP-] [  ] dev-qt/qtconcurrent-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtcore-4.8.6-r2:4
[IP-] [  ] dev-qt/qtcore-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtdbus-4.8.6-r1:4
[IP-] [  ] dev-qt/qtdbus-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtdeclarative-4.8.6-r1:4
[IP-] [  ] dev-qt/qtdeclarative-5.6.1-r1:5/5.6
[IP-] [  ] dev-qt/qtgraphicaleffects-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtgui-4.8.6-r4:4
[IP-] [  ] dev-qt/qtgui-5.6.1:5/5.6
[IP-] [  ] dev-qt/qthelp-4.8.6-r3:4
[IP-] [  ] dev-qt/qthelp-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtimageformats-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtmultimedia-4.8.6-r1:4
[IP-] [  ] dev-qt/qtmultimedia-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtnetwork-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtopengl-4.8.6-r1:4
[IP-] [  ] dev-qt/qtopengl-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtpaths-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtpositioning-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtprintsupport-5.6.1:5/5.6
[IP-] [M ] dev-qt/qtquick1-5.5.1-r1:5
[IP-] [  ] dev-qt/qtquickcontrols-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtscript-4.8.6-r2:4
[IP-] [  ] dev-qt/qtscript-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtsensors-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtsql-4.8.6-r1:4
[IP-] [  ] dev-qt/qtsql-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtsvg-4.8.6-r1:4
[IP-] [  ] dev-qt/qtsvg-5.6.1:5/5.6
[IP-] [  ] dev-qt/qttest-4.8.6-r1:4
[IP-] [  ] dev-qt/qttest-5.6.1:5/5.6
[IP-] [  ] dev-qt/qttranslations-4.8.6-r1:4
[IP-] [  ] dev-qt/qtwebchannel-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtwebkit-4.8.6-r1:4
[IP-] [  ] dev-qt/qtwebkit-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtwebsockets-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtwidgets-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtx11extras-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtxml-5.6.1:5/5.6
[IP-] [  ] dev-qt/qtxmlpatterns-4.8.6-r1:4
[IP-] [  ] dev-qt/qtxmlpatterns-5.6.1:5/5.6

Well, that's interesting...

Code: Select all

rich@graendalwired /etc/portage $ equery d qtquick1
 * These packages depend on qtquick1:

Notta... maybe if I remove qtquick1?

EDIT: No dice... still crashes after removing dev-qt/qtquick1:5

rc-update show:

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graendalwired portage # rc-update show
               binfmt | boot                         
             bootmisc | boot                         
                devfs |                       sysinit
                dmesg |                       sysinit
                 fsck | boot                         
             hostname | boot                         
              hwclock | boot                         
              keymaps | boot                         
            killprocs |              shutdown        
    kmod-static-nodes |                       sysinit
                local |      default                 
           localmount | boot                         
             loopback | boot                         
              modules | boot                         
             mount-ro |              shutdown        
                 mtab | boot                         
             netmount |      default                 
               procfs | boot                         
                 root | boot                         
            savecache |              shutdown        
                 swap | boot                         
            swapfiles | boot                         
               sysctl | boot                         
                sysfs |                       sysinit
         termencoding | boot                         
         tmpfiles.dev |                       sysinit
       tmpfiles.setup | boot                         
                 udev |                       sysinit
              urandom | boot

Note that I don't use openrc... so not sure what relevance the last one has...

[asturm]

Regardless of your current issues...

Code: Select all

USE="...gles1 gles2..."

...remove those from your make.conf and rebuild the affected dev-qt/*, kde-frameworks/* and kde-plasma/* packages. Actually it would be a good opportunity for rebuilding all of your installed kde-frameworks/* to see if it fixes your current problem.

rc-update show:

Code: Select all

graendalwired portage # rc-update show

Note that I don't use openrc... so not sure what relevance the last one has...

Obviously if you don't use it it is not relevant. But obviously if you don't provide the aforementioned information you can only get a general answer.

[KShots]

Regardless of your current issues...

Code: Select all

USE="...gles1 gles2..."

...remove those from your make.conf and rebuild the affected dev-qt/*, kde-frameworks/* and kde-plasma/* packages. Actually it would be a good opportunity for rebuilding all of your installed kde-frameworks/* to see if it fixes your current problem.

I was under the impression this was only important for Qt, as apparently only Qt did not "get along" with nvidia for egl, gles1, and gles2. Am I wrong? I've already disabled egl, gles1, and gles2 for Qt (via package.use), but did not do so for kde-frameworks/* nor kde-plasma/*... at any rate, I did the following:

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graendalwired rich # cat > /etc/portage/package.use/egl
dev-qt/* -egl -gles1 -gles2
kde-frameworks/* -egl -gles1 -gles2
kde-plasma/* -egl -gles1 -gles2
graendalwired rich # emerge -avuDN @world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] kde-frameworks/plasma-5.23.0:5/5.23::gentoo  USE="X -debug -egl* -gles2 {-test}" 0 KiB
[ebuild   R    ] kde-plasma/sddm-kcm-5.6.5:5::gentoo  USE="-debug*" 0 KiB
[ebuild   R    ] kde-plasma/kinfocenter-5.6.5:5::gentoo  USE="handbook nfs opengl pci -debug -egl* -gles -ieee1394 -samba -wayland" 0 KiB

Total: 3 packages (3 reinstalls), Size of downloads: 0 KiB

No dice, it still crashes... How can I trigger a rebuild of kde-frameworks/*?

rc-update show:

Code: Select all

graendalwired portage # rc-update show

Note that I don't use openrc... so not sure what relevance the last one has...

Obviously if you don't use it it is not relevant. But obviously if you don't provide the aforementioned information you can only get a general answer.

Fair enough... here's the nearest equivalent under systemd:

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graendalwired rich # systemctl list-units --type=service
UNIT                         LOAD   ACTIVE SUB     DESCRIPTION
acpid.service                loaded active running ACPI event daemon
bluetooth.service            loaded active running Bluetooth service
dbus.service                 loaded active running D-Bus System Message Bus
dracut-shutdown.service      loaded active exited  Restore /run/initramfs on shu
kmod-static-nodes.service    loaded active exited  Create list of required stati
lvm2-lvmetad.service         loaded active running LVM2 metadata daemon
lvm2-pvscan@254:0.service    loaded active exited  LVM2 PV scan on device 254:0
lvm2-pvscan@254:3.service    loaded active exited  LVM2 PV scan on device 254:3
lvm2-pvscan@8:18.service     loaded active exited  LVM2 PV scan on device 8:18
NetworkManager.service       loaded active running Network Manager
ntpd.service                 loaded active running Network Time Service
optiswitch.ga.service        loaded active exited  Alienware Graphics Amplifier 
polkit.service               loaded active running Authorization Manager
rpc-gssd.service             loaded active running RPC security service for NFS 
rpc-statd-notify.service     loaded active exited  Notify NFS peers of a restart
rpc-svcgssd.service          loaded active running RPC security service for NFS 
rpcbind.service              loaded active running RPC Bind
rtkit-daemon.service         loaded active running RealtimeKit Scheduling Policy
sddm.service                 loaded active running Simple Desktop Display Manage
sssd.service                 loaded active running System Security Services Daem
systemd-backlight@backlight:intel_backlight.service loaded active exited  Load/S
systemd-cryptsetup@luks\x2d58772e7e\x2d6727\x2d406d\x2d9c0d\x2d3c00ad5d0697.serv
systemd-cryptsetup@luks\x2d92a06d37\x2d9775\x2d4427\x2db15d\x2d3ba70b36089a.serv
systemd-cryptsetup@swap.service loaded active exited  Cryptography Setup for swa
systemd-fsck-root.service    loaded active exited  File System Check on Root Dev
systemd-fsck@dev-disk-by\x2duuid-68d220b9\x2d8fd8\x2d4b10\x2d900a\x2d14c81cb8174
systemd-fsck@dev-disk-by\x2duuid-96a33667\x2dc5d1\x2d4994\x2daa81\x2de75c6b12c92
systemd-fsck@dev-disk-by\x2duuid-a87cb6c4\x2de27d\x2d4683\x2db54f\x2d61ae86e9ed0
systemd-journal-flush.service loaded active exited  Flush Journal to Persistent 
systemd-journald.service     loaded active running Journal Service
systemd-logind.service       loaded active running Login Service
systemd-random-seed.service  loaded active exited  Load/Save Random Seed
systemd-remount-fs.service   loaded active exited  Remount Root and Kernel File 
systemd-rfkill@rfkill0.service loaded active exited  Load/Save RF Kill Switch St
systemd-rfkill@rfkill1.service loaded active exited  Load/Save RF Kill Switch St
systemd-rfkill@rfkill2.service loaded active exited  Load/Save RF Kill Switch St
systemd-sysctl.service       loaded active exited  Apply Kernel Variables
systemd-tmpfiles-setup-dev.service loaded active exited  Create Static Device No
systemd-tmpfiles-setup.service loaded active exited  Create Volatile Files and D
systemd-udev-trigger.service loaded active exited  udev Coldplug all Devices
systemd-udevd.service        loaded active running udev Kernel Device Manager
systemd-update-utmp.service  loaded active exited  Update UTMP about System Boot
systemd-user-sessions.service loaded active exited  Permit User Sessions
systemd-vconsole-setup.service loaded active exited  Setup Virtual Console
udisks2.service              loaded active running Disk Manager
upower.service               loaded active running Daemon for power management
user@1500.service            loaded active running User Manager for UID 1500
wpa_supplicant.service       loaded active running WPA supplicant

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

48 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

[BobWya]

@KShots,

Having had issues with Plasma 5 / Qt 5 building - since I first switched over (January 2016) I've switched to this belt-n-braces approach...

1. To update dev-qt/*:5 libraries ...

   Code: Select all

   equery list -F'=$cpv:$slot' dev-qt/* | grep ':5' | xargs emerge -1v

2. Then update kde-frameworks/* ...

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   equery list -F'=$cpv:$slot' kde-frameworks/* | xargs emerge -1v

3. Then update kde-plasma/* ...

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   equery list -F'=$cpv:$slot' kde-plasma/* | xargs emerge -v

So if you update your dev-qt/*:5 version or USE flags you need to manually build the Plasma 5 stack above this (i.e. 1 then 2 then 3).

If you update your kde-frameworks/* version or USE flags you need to manually build the Plasma 5 stack above this (i.e. 2 then 3).

Otherwise real bad things happen.

Check that all your library versions, at each level, are at the same version (or most recent supported) with the above commands as well!!

Portage won't do this stuff automatically for you!!

On the subject of kcm_sddm I've got a KDE Bug out on that... It core dumps everytime I launch it - unless I disable dev-qt/*:5 debug support.
I'm using the default/linux/amd64/13.0/desktop/plasma/systemd system profile btw (perhaps the same?)

Bob

[KShots]

...
On the subject of kcm_sddm I've got a KDE Bug out on that... It core dumps everytime I launch it - unless I disable dev-qt/*:5 debug support.

Bob

Well, that nails it on the head, then. I have debug support turned on for dev-qt/*:5 because I do a lot of development with Qt5. I can probably disable my debug support now, though, as the gentoo portage tree (and indeed the Qt overlay) doesn't support the Qt5 modules I am using (namely, Qt3d), so I have to have a separate installation of Qt5 outside of my system anyways.

EDIT: Confirmed, disabling debug on dev-qt/*:5 fixes each of the crashes I listed above. Someone may want to note this...

[asturm]

That's new to me, but it is known that enabling the debug use flag changes runtime behaviour. If what you want is crash dumps, the debug flag is wrong anyway.

So if you update your dev-qt/*:5 version or USE flags you need to manually build the Plasma 5 stack above this (i.e. 1 then 2 then 3).

If you update your kde-frameworks/* version or USE flags you need to manually build the Plasma 5 stack above this (i.e. 2 then 3).

That is not true. If you have been using live versions or non-tree Qt versions you are certainly more exposed to such issues, but affected Frameworks and Plasma packages use Qt subslots to be automatically rebuilt.