[SOLVED] KDE Plasmashell crashes on mouse taskbar hover

Message

allan · Post by **allan** » Sun Sep 06, 2020 9:05 pm

For the last couple of weeks, when the mouse pointer hovers over an item in the taskbar, plasmashell crashes.

The crash reports were consistent in saying where the crash was (libthread_db), so I rebuilt glibc which has that lib, and it still crashed.

I then rebuilt plasmashell (plasma-workspace), and even then it still kept crashing at the same spot.

So, I decided to do a full empty tree build of plasma-workspace. A day later, when everything was done, it still crashes.

Has anyone else encountered this, or have any other ideas?

Crash dump is below:

Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5022a120c0 (LWP 29289))]

Thread 9 (Thread 0x7f4fee69b700 (LWP 29421)):
[KCrash Handler]
#4 0x00007f5028b674fc in () at /usr/lib64/libX11.so.6
#5 0x00007f5028b67b7f in _XSetImage () at /usr/lib64/libX11.so.6
#6 0x00007f5028b6372f in XGetSubImage () at /usr/lib64/libX11.so.6
#7 0x00007f500e2f279f in () at /usr/lib64/libGLX_mesa.so.0
#8 0x00007f500e2f27f2 in () at /usr/lib64/libGLX_mesa.so.0
#9 0x00007f500dcd5734 in () at /usr/lib64/dri/swrast_dri.so
#10 0x00007f500db09d16 in () at /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#11 0x00007f500db0b79d in () at /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#12 0x00007f500db0bae7 in () at /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#13 0x00007f500db0be87 in () at /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#14 0x00007f502871ce2f in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () at /usr/lib64/libQt5Quick.so.5
#15 0x00007f502871d74b in QQuickWindowPrivate::updateDirtyNodes() () at /usr/lib64/libQt5Quick.so.5
#16 0x00007f502871ee2d in QQuickWindowPrivate::syncSceneGraph() () at /usr/lib64/libQt5Quick.so.5
#17 0x00007f50286bdbd8 in () at /usr/lib64/libQt5Quick.so.5
#18 0x00007f50286bfb3b in () at /usr/lib64/libQt5Quick.so.5
#19 0x00007f50286c3dd7 in () at /usr/lib64/libQt5Quick.so.5
#20 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#21 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#22 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f4feee9c700 (LWP 29411)):
#0 0x00007f5025d8ca73 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f50269ecdb3 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib64/libQt5Core.so.5
#2 0x00007f50269ece59 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#3 0x00007f50286c3b8f in () at /usr/lib64/libQt5Quick.so.5
#4 0x00007f50286c3e19 in () at /usr/lib64/libQt5Quick.so.5
#5 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#7 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f4feffff700 (LWP 29404)):
#0 0x00007f5025d8ca73 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f50269ecdb3 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib64/libQt5Core.so.5
#2 0x00007f50269ece59 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#3 0x00007f50286c3b8f in () at /usr/lib64/libQt5Quick.so.5
#4 0x00007f50286c3e19 in () at /usr/lib64/libQt5Quick.so.5
#5 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#7 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f500117e700 (LWP 29403)):
#0 0x00007f5025d8e08d in pthread_getspecific () at /lib64/libpthread.so.0
#1 0x00007f5025202650 in g_thread_self () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f50251d7f5f in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f5026bf068b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4 0x00007f5026b985a3 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5 0x00007f50269e653e in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5001816688 in KCupsConnection::run() () at /usr/lib64/libkcupslib.so
#7 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#8 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f5003607700 (LWP 29399)):
#0 0x00007f5025d8ca73 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f50269ecdb3 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib64/libQt5Core.so.5
#2 0x00007f50269ece59 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#3 0x00007f50286c3b8f in () at /usr/lib64/libQt5Quick.so.5
#4 0x00007f50286c3e19 in () at /usr/lib64/libQt5Quick.so.5
#5 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#7 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f5003e08700 (LWP 29398)):
#0 0x00007f50265cc684 in read () at /lib64/libc.so.6
#1 0x00007f502522180f in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f50251d7946 in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f50251d7de3 in () at /usr/lib64/libglib-2.0.so.0
#4 0x00007f50251d7f6f in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5 0x00007f5026bf068b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5026b985a3 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#7 0x00007f50269e653e in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#8 0x00007f50285fabf6 in () at /usr/lib64/libQt5Quick.so.5
#9 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#10 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f500f5ef700 (LWP 29354)):
#0 0x00007f50265d0c2f in poll () at /lib64/libc.so.6
#1 0x00007f50251d7e36 in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f50251d7f6f in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f5026bf068b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4 0x00007f5026b985a3 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5 0x00007f50269e653e in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6 0x00007f502834dc05 in () at /usr/lib64/libQt5Qml.so.5
#7 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#8 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#9 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f50149e9700 (LWP 29333)):
#0 0x00007f50251d42fc in () at /usr/lib64/libglib-2.0.so.0
#1 0x00007f50251d5d95 in () at /usr/lib64/libglib-2.0.so.0
#2 0x00007f50251d775f in g_main_context_check () at /usr/lib64/libglib-2.0.so.0
#3 0x00007f50251d7de3 in () at /usr/lib64/libglib-2.0.so.0
#4 0x00007f50251d7f6f in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5 0x00007f5026bf068b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#6 0x00007f5026b985a3 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#7 0x00007f50269e653e in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#8 0x00007f5027c14598 in () at /usr/lib64/libQt5DBus.so.5
#9 0x00007f50269e760d in () at /usr/lib64/libQt5Core.so.5
#10 0x00007f5025d86017 in start_thread () at /lib64/libpthread.so.0
#11 0x00007f50265db7af in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f5022a120c0 (LWP 29289)):
#0 0x00007f5025d8ca73 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1 0x00007f50269ecdb3 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib64/libQt5Core.so.5
#2 0x00007f50269ece59 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQt5Core.so.5
#3 0x00007f50286c1fac in () at /usr/lib64/libQt5Quick.so.5
#4 0x00007f50286c2ea0 in () at /usr/lib64/libQt5Quick.so.5
#5 0x00007f50286c3883 in () at /usr/lib64/libQt5Quick.so.5
#6 0x00007f5026fa2205 in QWindow::event(QEvent*) () at /usr/lib64/libQt5Gui.so.5
#7 0x00007f502872bff9 in QQuickWindow::event(QEvent*) () at /usr/lib64/libQt5Quick.so.5
#8 0x00007f5028f26e2b in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib64/libKF5PlasmaQuick.so.5
#9 0x00007f500db01126 in () at /usr/lib64/qt5/qml/org/kde/plasma/core/libcorebindingsplugin.so
#10 0x00007f502760229f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#11 0x00007f502760b750 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#12 0x00007f5026b998bf in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#13 0x00007f5026f98c8f in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /usr/lib64/libQt5Gui.so.5
#14 0x00007f5026f98ecc in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib64/libQt5Gui.so.5
#15 0x00007f5026f725da in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Gui.so.5
#16 0x00007f50157748ba in () at /usr/lib64/libQt5XcbQpa.so.5
#17 0x00007f50251d7c38 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#18 0x00007f50251d7eb8 in () at /usr/lib64/libglib-2.0.so.0
#19 0x00007f50251d7f6f in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#20 0x00007f5026bf0662 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#21 0x00007f5026b985a3 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#22 0x00007f5026ba080f in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#23 0x00005589321174fe in ()
#24 0x00007f5026503d0e in __libc_start_main () at /lib64/libc.so.6
#25 0x00005589321176ba in _start ()
[Inferior 1 (process 29289) detached]

Use flags for plasma-workspace:

Found these USE flags for kde-plasma/plasma-workspace-5.18.5-r1:
U I
- - appstream : Enable AppStream software metadata support
+ + calendar : Add support for calendars (not using mcal!)
- - debug : Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Qu ... Backtraces
+ + geolocation : Enables dataengine providing location information
- - gps : Add support for Global Positioning System
+ + handbook : Enable handbooks generation for packages by KDE
- - qalculate : Enable Qalculate runner using sci-libs/libqalculate
- - qrcode : Enable support for creating QR codes from clipboard data using kde-frameworks/prison
+ + semantic-desktop : Cross-KDE support for semantic search and information retrieval
- - systemd : Enable use of systemd-specific libraries and features like socket activation or session tracking
- - telemetry : Enable User Feedback control module for kde-plasma/systemsettings
- - test : Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)

And the output of emerge --info:

Portage 3.0.4 (python 3.7.8-final-0, default/linux/amd64/17.1/desktop/plasma, gcc-9.3.0, glibc-2.31-r6, 5.4.60-gentoo x86_64)
=================================================================
System uname: Linux-5.4.60-gentoo-x86_64-AMD_Phenom-tm-_II_X4_965_Processor-with-gentoo-2.7
KiB Mem: 16426032 total, 8331120 free
KiB Swap: 33575840 total, 33575832 free
Timestamp of repository gentoo: Fri, 04 Sep 2020 17:30:01 +0000
Head commit of repository gentoo: 23058752eea10ee29d2eba26511af922ba296d6b
Head commit of repository foo-overlay: 0d97076c9bfe05f7ac686ae0d290846659bee2f9

Head commit of repository mva: 1b25d38d2c4c0070563228fabcdac9a84c912251

Head commit of repository sakaki-tools: b40dc95312804e3bfd1b991657c2356607b71f59

sh bash 5.0_p18
ld GNU ld (Gentoo 2.33.1 p2) 2.33.1
ccache version 3.7.11 [disabled]
app-shells/bash: 5.0_p18::gentoo
dev-java/java-config: 2.3.1::gentoo
dev-lang/perl: 5.30.3::gentoo
dev-lang/python: 2.7.18-r1::gentoo, 3.7.8-r2::gentoo, 3.8.5::gentoo
dev-util/ccache: 3.7.11::gentoo
dev-util/cmake: 3.16.5::gentoo
dev-util/pkgconfig: 0.29.2::gentoo
sys-apps/baselayout: 2.7::gentoo
sys-apps/openrc: 0.42.1::gentoo
sys-apps/sandbox: 2.18::gentoo
sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r5::gentoo
sys-devel/automake: 1.16.1-r1::gentoo
sys-devel/binutils: 2.33.1-r1::gentoo
sys-devel/gcc: 9.3.0-r1::gentoo
sys-devel/gcc-config: 2.3.1::gentoo
sys-devel/libtool: 2.4.6-r6::gentoo
sys-devel/make: 4.2.1-r4::gentoo
sys-kernel/linux-headers: 5.4-r1::gentoo (virtual/os-headers)
sys-libs/glibc: 2.31-r6::gentoo
Repositories:

gentoo
location: /usr/portage
sync-type: rsync
sync-uri: rsync://rsync.gentoo.org/gentoo-portage
priority: -1000
sync-rsync-extra-opts:
sync-rsync-verify-jobs: 1
sync-rsync-verify-metamanifest: yes
sync-rsync-verify-max-age: 24

my_ebuilds
location: /usr/local/portage
masters: gentoo
priority: 0

foo-overlay
location: /var/db/foo/foo-overlay
sync-type: git
sync-uri: https://github.com/slashbeast/foo-overlay.git
masters: gentoo
priority: 50

mva
location: /var/db/repos/mva
sync-type: git
sync-uri: https://github.com/msva/mva-overlay.git
masters: gentoo
priority: 50

sakaki-tools
location: /var/db/repos/sakaki-tools
sync-type: git
sync-uri: https://github.com/sakaki-/sakaki-tools.git
masters: gentoo
priority: 50

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=amdfam10 -O2 -pipe"
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/php/apache2-php7.4/ext-active/ /etc/php/cgi-php7.4/ext-active/ /etc/php/cli-php7.4/ext-active/ /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="-march=amdfam10 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--jobs=5 --load-average=4"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="https://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ https://gentoo.osuosl.org/ rsync://mirrors.rit.edu/gentoo/"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="en_US"
MAKEOPTS="-j5 -l4"
PKGDIR="/var/cache/binpkgs"
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 Xaw3d a52 aac aalib acl acpi activities alsa amd64 ao audiofile bash-completion berkdb bidi bluetooth branding bzip2 cairo calendar canna cdda cddb cdr cjk cli crypt css cups curl dbus declarative dga djvu dri dts dv dvb dvd dvdr elogind emboss encode exif fbcon ffmpeg fftw flac fontconfig fortran freewnn ftp gd gdbm geolocation gif gimp git glut gmp gnuplot gnutls gphoto2 gpm graphviz gstreamer gtk gui iconv icu ieee1394 imagemagick imap ipod ipv6 jack java javascript jbig jit jpeg jpeg2k kde kipi kwallet ladspa lame lash latex lcms ldap libass libcaca libglvnd libnotify libsamplerate libtirpc lzma lzo mad mikmod mms mng motif mp3 mp4 mpeg mplayer mtp multilib musepack musicbrainz ncurses nis nls nntp nptl nsplugin ocaml offensive ogg opengl openmp pam pango pcre pda pdf perl phonon php plasma png policykit posix postgres ppds pulseaudio python qml qt5 quicktime raw readline rss ruby samba sasl scanner sdl seccomp semantic-desktop smp soap sockets socks5 sound sox speex spell split-usr ssl startup-notification svg syslog szip tcl tcpd theora threads tidy tiff timidity tk truetype udev udisks unicode upower usb v4l vaapi vcd vim-syntax vnc vorbis wavpack webkit widgets wmf wxwidgets x264 xattr xcb xcomposite xface xft xine xinerama xinetd xml xmlrpc xpm xv xvid zip zlib" ABI_X86="64" ADA_TARGET="gnat_2018" 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="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="3dnow 3dnowext mmx mmxext popcnt sse sse2 sse3 sse4a" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 pc" INPUT_DEVICES="evdev libinput" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python2_7 python3_7" QEMU_SOFTMMU_TARGETS="arm x86_64 sparc" QEMU_USER_TARGETS="x86_64" RUBY_TARGETS="ruby25" SANE_BACKENDS="epson epson2" USERLAND="GNU" VIDEO_CARDS="nouveau fbdev" 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, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Blind_Sniper · Post by **Blind_Sniper** » Sun Sep 06, 2020 11:29 pm

I had plasma crashes recently, but a bit in a different way: plasma crashed when mouse pointer hovered items and items's thumbnail (or tooltip) was about appearing. At the moment when thumbnail appeared plasma gets crashed. Apart from this there was very slow rendering for KMenu, calendar widget and Systemsettings window.

I noticed that crashes went away after world update, and the only related package I saw in updates list was a qtgui package.
It was updated from dev-qt/qtgui-5.14.2 to dev-qt/qtgui-5.14.2-r1
May be it worth to rebuild/update qtgui?

allan · Post by **allan** » Mon Sep 07, 2020 6:40 pm

Blind_Sniper wrote:I noticed that crashes went away after world update, and the only related package I saw in updates list was a qtgui package.
It was updated from dev-qt/qtgui-5.14.2 to dev-qt/qtgui-5.14.2-r1
May be it worth to rebuild/update qtgui?

My qtgui is at 5.14.2-r1, and it was one of the rebuilt packages when I did the empty tree re-emerge of plasma-workspace.

Post by **asturm** » Mon Sep 07, 2020 6:49 pm

Crash dump hints at a crash in mesa or X, but you don't have nearly enough debug symbols to tell anything more.

I would try with different versions of kernel, mesa, nouveau.

In the last couple of weeks there were no big changes to Plasma components in stable.

allan · Post by **allan** » Sat Sep 12, 2020 10:01 pm

asturm wrote:Crash dump hints at a crash in mesa or X, but you don't have nearly enough debug symbols to tell anything more.

I would try with different versions of kernel, mesa, nouveau.

In the last couple of weeks there were no big changes to Plasma components in stable.

It looks like it was mesa, which I started investigating after noticing certain videos were now stuttering in their playback.

I rebuilt it, but the problem persisted. So, I looked at it's use flags, and cross-referenced the settings with information from nouveau.freedesktop.org, and realized I didn't have any of the acceleration or 3D options activated. I was also using a setting they didn't recommend for my video card (Quadro 4000).

After changing those settings and rebuilding, it's all working now.

My previous flags for mesa: X abi_x86_32 classic dri3 egl gbm gles2 llvm osmesa vaapi video_cards_nouveau wayland xvmc zstd

New flags: X abi_x86_32 classic d3d9 dri3 egl gallium gbm gles1 gles2 llvm osmesa vaapi valgrind vdpau video_cards_nouveau wayland xa zstd

The d3d9 was added as I do run programs under wine, and the gles1 was a "why not, something might want it".

The gallium and vdpau were on the recommendation of the information at nouveau.freedesktop.org, as well as replacing xvmc with xa for my particular video card.

The valgrind option I'm not sure if has any real effect, as I put in thinking that it was another "something might want it". (But be forewarned, you need to add "splitdebug" to your make.conf FEATURES variable, and rebuild glibc for valgrind to work properly.)