Since switching distro to fedora, I encountered a rather weird issue, the taskbar seems to randomly freeze for a few seconds when switching windows by clicking on their respective icons, does not seem to happen when alt-tabbing. I've managed to observe several of these entries when the taskbar becomes unresponsive: kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling It's becoming a rather annoying situation, because when this occurs the taskbar thinks I'm dragging application icons around, aside obviously from the 1-2 second lag when switching windows. Below the full log: <pre> ➜ ~ kwin_x11 --replace Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing. kwin_platform_x11_standalone: Has XInput support 2 . 2 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 16777235, major code: 20 (GetProperty), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 16777235, major code: 20 (GetProperty), minor code: 0 kwin_core: Extensions: shape: 0x "11" composite: 0x "4" render: 0x "b" fixes: 0x "50" randr: 0x "14" sync: 0x "31" damage: 0x "11" kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5089:46: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5091:48: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5093:48: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5097:47: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5099:46: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5107:48: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5111:46: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5113:46: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5117:45: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: /usr/share/X11/locale/en_US.UTF-8/Compose:5120:46: this compose sequence is a duplicate of another; skipping line kwin_xkbcommon: XKB: created compose table from locale en_US.UTF-8 with path /usr/share/X11/locale/en_US.UTF-8/Compose kwin_xkbcommon: XKB: Compiling from RMLVO: rules 'evdev', model 'asus_laptop', layout 'us', variant '(null)', options '(null)' kwin_xkbcommon: XKB: Compiling from KcCGST: keycodes 'evdev+aliases(qwerty)', types 'complete', compat 'complete', symbols 'pc+us+inet(evdev)' kwin_xkbcommon: XKB: Compiling xkb_keycodes "(unnamed)" kwin_xkbcommon: XKB: Compiling xkb_types "(unnamed)" kwin_xkbcommon: XKB: Compiling xkb_compatibility "(unnamed)" kwin_xkbcommon: XKB: The "group" statement in compat is unsupported; Ignored kwin_xkbcommon: XKB: The "group" statement in compat is unsupported; Ignored kwin_xkbcommon: XKB: The "group" statement in compat is unsupported; Ignored kwin_xkbcommon: XKB: The "allowExplicit" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: The "allowExplicit" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: The "allowExplicit" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: The "allowExplicit" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: The "indicatorDrivesKeyboard" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: The "allowExplicit" field in indicator statements is unsupported; Ignored kwin_xkbcommon: XKB: Indicator name "Shift Lock" was not declared in the keycodes section; Adding new indicator kwin_xkbcommon: XKB: Indicator name "Group 2" was not declared in the keycodes section; Adding new indicator kwin_xkbcommon: XKB: Indicator name "Mouse Keys" was not declared in the keycodes section; Adding new indicator kwin_xkbcommon: XKB: Compiling xkb_symbols "(unnamed)" kwin_decorations: Trying to load decoration plugin: "/usr/lib64/qt5/plugins/org.kde.kdecoration2/breezedecoration.so" kwin_core: User timestamp, ASN: 27432172 kwin_core: User timestamp, final: KWin::X11Client(0x562e4459c770, windowId=0x1800019, caption="Desktop — Plasma <@fedora>\u200E") : 27432172 kwin_core: User timestamp, ASN: 27851900 kwin_core: User timestamp, final: KWin::X11Client(0x562e4456bd70, windowId=0x6000005, caption="Atos SSO") : 27851900 kwin_core: User timestamp, ASN: 27972786 kwin_core: User timestamp, final: KWin::X11Client(0x562e445a0370, windowId=0x520002c, caption="KWin/Debugging - KDE Community Wiki — Mozilla Firefox") : 27972786 kwin_core: User timestamp, ASN: 27902960 kwin_core: User timestamp, final: KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E") : 27902960 kwin_core: User timestamp, ASN: 27979388 kwin_core: User timestamp, final: KWin::X11Client(0x562e446699a0, windowId=0x2e00007, caption="~ : zsh — Yakuake <@fedora>\u200E") : 27979388 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 1649, resource id: 16777251, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1650, resource id: 16777251, major code: 14 (GetGeometry), minor code: 0 kwin_core: Attempting to load the OpenGL scene kwin_platform_x11_standalone: Choosing GLXFBConfig 0x20d X visual 0x56c depth 24 RGBA 8:8:8:0 ZS 0:0 sRGB: 1 kwin_platform_x11_standalone: Global share context format: QSurfaceFormat(version 4.6, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions|ResetNotification), depthBufferSize 0, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0, stencilBufferSize 0, samples -1, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::CompatibilityProfile) kwin_platform_x11_standalone: Created GLX context with attributes: Version requested: true Version: 3.1 Robust: true Reset on video memory purge: false Forward compatible: false Core profile: false Compatibility profile: false High priority: false OpenGL vendor string: AMD OpenGL renderer string: AMD RENOIR (DRM 3.44.0, 5.17.13-200.fc35.x86_64, LLVM 13.0.0) OpenGL version string: 4.6 (Compatibility Profile) Mesa 21.3.8 OpenGL shading language version string: 4.60 Driver: RadeonSI GPU class: Vega OpenGL version: 4.6 GLSL version: 4.60 Mesa version: 21.3.8 X server version: 1.20.14 Linux kernel version: 5.17.13 Requires strict binding: yes GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no kwin_platform_x11_standalone: Direct rendering: true kwin_core: OpenGL compositing has been successfully initialized kwin_core: Successfully loaded plugin effect: "startupfeedback" kwin_core: Successfully loaded plugin effect: "screenshot" kwin_core: Successfully loaded plugin effect: "contrast" kwin_core: Successfully loaded plugin effect: "blur" kwin_core: Successfully loaded plugin effect: "zoom" kwin_core: Successfully loaded plugin effect: "slidingpopups" kwin_core: Successfully loaded plugin effect: "slide" kwin_core: Successfully loaded plugin effect: "screenedge" kwin_core: Successfully loaded plugin effect: "presentwindows" kwin_core: Effect is not supported: "screentransform" kwin_core: Successfully loaded plugin effect: "kscreen" kwin_core: Successfully loaded plugin effect: "highlightwindow" kwin_core: Successfully loaded plugin effect: "desktopgrid" kwin_core: Successfully loaded plugin effect: "colorpicker" kwin_platform_x11_standalone: Using FBConfig 0x49f for visual 0x695 kwin_platform_x11_standalone: Using FBConfig 0x193 for visual 0x4f2 kwin_platform_x11_standalone: Using FBConfig 0x49f for visual 0x695 kwin_core: XCB error: 10 (BadAccess), sequence: 1799, resource id: 1709, major code: 142 (Composite), minor code: 2 (RedirectSubwindows) kwin_core: Successfully loaded scripted effect: "kwin4_effect_scale" kwin_core: Successfully loaded scripted effect: "kwin4_effect_morphingpopups" kwin_core: Successfully loaded scripted effect: "kwin4_effect_fadingpopups" kwin_core: Successfully loaded scripted effect: "kwin4_effect_dialogparent" kwin_core: Successfully loaded scripted effect: "kwin4_effect_sessionquit" kwin_core: Successfully loaded scripted effect: "kwin4_effect_squash" kwin_core: Successfully loaded scripted effect: "kwin4_effect_login" kwin_core: Successfully loaded scripted effect: "kwin4_effect_fullscreen" kwin_core: Successfully loaded scripted effect: "kwin4_effect_frozenapp" kwin_core: Successfully loaded scripted effect: "kwin4_effect_maximize" kwin_core: Successfully loaded scripted effect: "kwin4_effect_windowaperture" kwin_core: Successfully loaded scripted effect: "kwin4_effect_logout" kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: getaddrinfo failed with error: Name or service not known kwin_core: getaddrinfo failed with error: Name or service not known kwin_core: getaddrinfo failed with error: Name or service not known kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: User timestamp, ASN: 28004008 kwin_core: User timestamp, final: KWin::X11Client(0x562e450c4640, windowId=0x1800051, caption="Plasma <@fedora>\u200E", transientFor=KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E")) : 28004008 kwin_core: Activation: No client active, allowing kwin_core: User timestamp, ASN: 28007760 kwin_core: User timestamp, final: KWin::X11Client(0x562e450c60c0, windowId=0x1800051, caption="Plasma <@fedora>\u200E", transientFor=KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E")) : 28007760 kwin_core: Activation: No client active, allowing kwin_core: User timestamp, ASN: 28011510 kwin_core: User timestamp, final: KWin::X11Client(0x562e450c74c0, windowId=0x1800051, caption="Plasma <@fedora>\u200E", transientFor=KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E")) : 28011510 kwin_core: Activation: No client active, allowing kwin_core: User timestamp, ASN: 28022759 kwin_core: User timestamp, final: KWin::X11Client(0x562e44db76c0, windowId=0x1800051, caption="Plasma <@fedora>\u200E", transientFor=KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E")) : 28022759 kwin_core: Activation, compared: KWin::X11Client(0x562e44db76c0, windowId=0x1800051, caption="Plasma <@fedora>\u200E", transientFor=KWin::X11Client(0x562e446668d0, windowId=0x1800039, caption="Plasma <@fedora>\u200E")) : 28022759 : 28022142 : true kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling kwin_core: void KWin::Item::stackBefore(KWin::Item*) requires a valid sibling