Created attachment 896856 [details] tigervnc session log When a plasmax11 session is started under Xvnc by net-misc/tigervnc-1.13.90-r1 initscript, kglobalacceld reacts to the first keystroke input from a connected VNC client by jumping to 100% CPU usage. If /usr/libexec/kglobalacceld is then manually killed and launched again, it does not max the CPU again but has the effect of blocking *all* keyboard input from the client, e.g. text cannot be typed in a KWrite window or Yakuake session. A version of this bug existed in KDE5, however after killing and relaunching the then-named kglobalaccel5 it did then function normally. Now in KDE6 that is not achievable. I tried equivalent actions with KDE5 under tigervnc-server on a Raspberry Pi5 / RaspiOS Bookworm and the bug did not occur (CPU stayed calm and kglobalaccel5 handled global shortcuts correctly). I wonder therefore if the cause may be related to absence of systemd. I attach a tigervnc session log showing a session where I: - Started the tigervnc initscript from a console VT with plasmax11 session configured for my user - connected via tigervnc-client from another machine - Pressed CTRL key to trigger the CPU surge - Issued "killall -USR1 kglobalacceld" via a desktop shortcut (only way I can do so when the bug triggers) - Opened yakuake via its tray icon - Opened Kwrite and dolphin from iconbar to test shortcut function - Issued "/usr/libexec/kglobalacceld" in yakuake - Attempted global shortcuts e.g. Alt-Tab with the opened apps (nope) - Attempted typing in another tab in yakuake (nope) - Killed kglobalacceld again by closing the tab in yakuake - Shutdown the machine emerge --info kglobalacceld Portage 3.0.65 (python 3.12.4-final-0, default/linux/amd64/23.0/split-usr/desktop/plasma, gcc-13, glibc-2.39-r9, 6.9.1-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-6.9.1-gentoo-x86_64-Intel-R-_Core-TM-_i7-7600U_CPU_@_2.80GHz-with-glibc2.39 KiB Mem: 16117220 total, 10993412 free KiB Swap: 18753532 total, 18753532 free Timestamp of repository gentoo: Tue, 02 Jul 2024 20:00:01 +0000 Head commit of repository gentoo: 9df1dd1f1c84af49e0235de506c5759b911bd419 sh bash 5.2_p26-r6 ld GNU ld (Gentoo 2.42 p6) 2.42.0 ccache version 4.10.1 [disabled] app-misc/pax-utils: 1.3.7::gentoo app-shells/bash: 5.2_p26-r6::gentoo dev-build/autoconf: 2.72-r1::gentoo dev-build/automake: 1.16.5-r2::gentoo dev-build/cmake: 3.29.3::gentoo dev-build/libtool: 2.4.7-r4::gentoo dev-build/make: 4.4.1-r1::gentoo dev-build/meson: 1.4.1::gentoo dev-java/java-config: 2.3.4::gentoo dev-lang/perl: 5.40.0::gentoo dev-lang/python: 3.12.4_p1::gentoo, 3.13.0_beta3::gentoo dev-lang/rust-bin: 1.79.0::gentoo dev-util/ccache: 4.10.1::gentoo sys-apps/baselayout: 2.15::gentoo sys-apps/openrc: 0.54.2::gentoo sys-apps/sandbox: 2.39::gentoo sys-devel/binutils: 2.42-r2::gentoo sys-devel/binutils-config: 5.5::gentoo sys-devel/clang: 17.0.6::gentoo, 18.1.7::gentoo sys-devel/gcc: 13.2.1_p20240503::gentoo sys-devel/gcc-config: 2.11::gentoo sys-devel/llvm: 17.0.6::gentoo, 18.1.7::gentoo sys-kernel/linux-headers: 6.9::gentoo (virtual/os-headers) sys-libs/glibc: 2.39-r9::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://hazel/gentoo-portage priority: -1000 volatile: True sync-rsync-extra-opts: sync-rsync-verify-metamanifest: no sync-rsync-verify-jobs: 1 sync-rsync-verify-max-age: 3 x-portage location: /usr/local/portage masters: gentoo priority: 0 volatile: True ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php8.1/ext-active/ /etc/php/apache2-php8.2/ext-active/ /etc/php/apache2-php8.3/ext-active/ /etc/php/cgi-php8.1/ext-active/ /etc/php/cgi-php8.2/ext-active/ /etc/php/cgi-php8.3/ext-active/ /etc/php/cli-php8.1/ext-active/ /etc/php/cli-php8.2/ext-active/ /etc/php/cli-php8.3/ext-active/ /etc/php/fpm-php8.1/ext-active/ /etc/php/fpm-php8.2/ext-active/ /etc/php/fpm-php8.3/ext-active/ /etc/php/phpdbg-php8.1/ext-active/ /etc/php/phpdbg-php8.2/ext-active/ /etc/php/phpdbg-php8.3/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-march=native -O2 -pipe -fomit-frame-pointer" DISTDIR="/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--nospinner --verbose-conflicts --quiet-build=n" ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE 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 XDG_STATE_HOME" FCFLAGS="-march=native -O2 -pipe -fomit-frame-pointer" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs buildpkg-live distlocks ebuild-locks fail-clean fixlafiles ipc-sandbox merge-sync merge-wait multilib-strict network-sandbox news pid-sandbox pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-march=native -O2 -pipe -fomit-frame-pointer" GENTOO_MIRRORS="http://www.mirrorservice.org/sites/distfiles.gentoo.org/ http://mirrors.gethosted.online/gentoo http://mirrors.soeasyto.com/distfiles.gentoo.org/" LANG="en_GB.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs" LEX="flex" LINGUAS="en_GB" MAKEOPTS="-j5" 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="/tmp" SHELL="/bin/bash" USE="X a52 aac acl acpi activities alsa amd64 bash-completion bluetooth branding bzip2 cairo cdda cddb cdr cet crypt css cups dbus declarative dga djvu dri dri3 dts dvd dvdr egl elogind encode exif fam fbcon ffmpeg flac ftp gd gdbm geoip gif gimp gles gles2 gmp gnutls gphoto2 gpm graphviz gtk gui hddtemp iconv icu imagemagick imap inotify ipv6 java javascript jit jpeg kde kf6compat kwallet lame latex lcms libglvnd libkms libnotify libtirpc lm-sensors lto lzma lzo mad maildir matroska mbox mmap mng mp3 mp4 mpeg mplayer mtp multilib musicbrainz mysql ncurses networkmanager nls nptl nsplugin ocamlopt offensive ofx ogg opengl openmp pam pango pcre pda pdf perl php pipewire plasma png policykit posix postscript ppds pulseaudio qml qt5 quicktime radius raw readline rss rtc samba scanner screencast sdl seccomp session sharedmem smp snmp sockets socks5 sound spell split-usr sqlite sqlite3 ssl startup-notification subversion svg syslog tcpd test-rust theora threads tidy tiff tk tokenizer touchpad truetype udev udisks ukit unicode upnp upnp-av upower usb v4l vaapi vcd vhosts vnc vorbis vulkan wayland webp widgets wifi wmf wps wxwidgets x264 xattr xcb xcomposite xft xine xml xpm xscreensaver xv xvid xvmc zlib" ABI_X86="64" ADA_TARGET="gcc_12" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio 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="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt rdrand sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 ntrip navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" GRUB_PLATFORMS="efi-64 multiboot" INPUT_DEVICES="libinput" KERNEL="linux" L10N="en-GB" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LLVM_TARGETS="X86 BPF" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-2" POSTGRES_TARGETS="postgres15" PYTHON_SINGLE_TARGET="python3_12" PYTHON_TARGETS="python3_12" RUBY_TARGETS="ruby31 ruby32" SANE_BACKENDS="hp net" VIDEO_CARDS="intel i965 iris" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto logmark ipmark dhcpmac delude chaos account" Unset: ADDR2LINE, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LD, LFLAGS, LIBTOOL, MAKE, MAKEFLAGS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PYTHONPATH, RANLIB, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS ================================================================= Package Settings ================================================================= kde-plasma/kglobalacceld-6.1.2::gentoo was built with the following: USE="X -debug -test" ABI_X86="(64)"
If you're already subscribed to an upstream bug for this: please mention that.
Noted and apologies for the omission, but I (and one or two other Gentooers) arguably hijacked that ancient bug and brought a very broad set of symptoms and contexts to the table that in retrospect just muddied the waters irretrievably. I'm less then convinced everyone subscribed there even has the same bug.
For the sake of eliminating that stale config had anything to do with this, I tried removing first ~/.config/kglobalshortcutsrc and then ~/.config in its entirety. In both cases the bug still occurred. If there is something further that needs doing to start with a 100% blank Plasma session, please advise and I'll try it. [Sidenote: When ~/.config/kglobalshortcutsrc is generated from scratch, as in both cases above, kwin has no default shortcuts created, not even Alt+Tab. Is this normal/expected?]
(In reply to Robin Bankhead from comment #2) > Noted and apologies for the omission, but I (and one or two other Gentooers) > arguably hijacked that ancient bug and brought a very broad set of symptoms > and contexts to the table that in retrospect just muddied the waters > irretrievably. I'm less then convinced everyone subscribed there even has > the same bug. In that case you should open a different upstream bug. It is unlikely to be solved here.
I raised a report here because this specific behaviour is not seen when running the same software combo under systemd, and Gentoo is almost unique in that it does not default to systemd. I understand that it's upstream's bug to fix, but my hope was that Gentoo devs who have done the work to make KDE and tigervnc work on Gentoo (tigervnc officially doesn't even support non-systemd usage now as I understand it, and I bet KDE has increased presumption of it* with this release) might have some insight on how this unique environment might play into it. Upstream is a dead end unless any devs there are running Gentoo (or I suppose Void/Slackware/whatever else remains non-systemd). * Maybe I'm wrong about that but it's just a hunch when the attached log contains e.g. "kf.kio.gui: Failed to determine systemd version, falling back to extremely legacy forking mode." and "Couldn't start kglobalaccel from org.kde.kglobalaccel.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kglobalaccel was not provided by any .service files")"
(In reply to Robin Bankhead from comment #5) Please do anyway -- we do work with upstream on these issues and often they give us advice even if they don't prioritise working on the bugs sometimes.
Reported https://bugs.kde.org/show_bug.cgi?id=489840
