SUMMARY Upgraded neon today, there were plenty of kde related updates, and now kscreenlocker_greet crashes every time the screen is locked and causes a screen that says "loginctl unlock-session #" to unlock to appear. Rebooting, removing kde related cache files under $HOME/.cache/, etc doesn't help. STEPS TO REPRODUCE 1. Upgraded to current neon today 2. Broke OBSERVED RESULT Error screen EXPECTED RESULT Should work SOFTWARE VERSIONS (available in About System) -- THIS TEMPLATE NEEDS TO BE FIXED WHERE IS ABOUT SYETEM? KDE Plasma Version: 5.14.1-0xneon+18.04+bionic+build (various numbers) KDE Frameworks Version: 5.51.0-0xneon+18.04+bionic+build (various numbers) Qt Version: 5.11.2+dfsg-0xneon+18.04+bionic+build (various numbers) ADDITIONAL INFORMATION .xsession-errors shows the following: KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 10400 KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 38 UnmapNotify: 90177550 UnmapNotify: 90177553 UnmapNotify: 90177555 UnmapNotify: 90177575 CreateNotify: 90177540 Qt: Session management error: networkIdsList argument is NULL CreateNotify: 90177544 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9004, resource id: 90177575, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 9005, resource id: 90177575, major code: 14 (GetGeometry), minor code: 0 CreateNotify: 90177549 kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" CreateNotify: 90177550 CreateNotify: 90177552 MapNotify: 90177550 kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" CreateNotify: 90177553 MapNotify: 90177553 kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" CreateNotify: 90177555 MapNotify: 90177555 kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" UdevQt: unable to create udev monitor connection CreateNotify: 90177567 Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile QObject::connect: invalid null parameter CreateNotify: 90177575 MapNotify: 90177575 QObject::connect: invalid null parameter QObject::connect: invalid null parameter QObject::connect: invalid null parameter QObject::connect: invalid null parameter KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kscreenlocker_greet path = /usr/lib/x86_64-linux-gnu/libexec pid = 10410 KCrash: Arguments: /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 38 UnmapNotify: 90177550 UnmapNotify: 90177553 UnmapNotify: 90177555 UnmapNotify: 90177575 MapNotify: 27263016 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9103, resource id: 90177552, major code: 18 (ChangeProperty), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9105, resource id: 90177550, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 9106, resource id: 90177550, major code: 14 (GetGeometry), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9109, resource id: 90177553, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 9110, resource id: 90177553, major code: 14 (GetGeometry), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9113, resource id: 90177555, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 9114, resource id: 90177555, major code: 14 (GetGeometry), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 9117, resource id: 90177575, major code: 3 (GetWindowAttributes), minor code: 0 qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 9118, resource id: 90177575, major code: 14 (GetGeometry), minor code: 0 Grab Released powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_33" powerdevil: Current session is now active powerdevil: ACTIVE SESSION PATH CHANGED: "/org/freedesktop/login1/session/_33" powerdevil: Current session is now active Initializing "kcm_mouse" : "kcminit_mouse" kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher. qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 10242, resource id: 90177541, major code: 18 (ChangeProperty), minor code: 0 Initializing "kcm_mouse" : "kcminit_mouse" kdeinit5: Got SETENV 'XCURSOR_THEME=breeze_cursors' from launcher. qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 10262, resource id: 92274693, major code: 18 (ChangeProperty), minor code: 0 Running the command directly from konsole shows the following: $ /usr/lib/x86_64-linux-gnu/libexec/kscreenlocker_greet --immediateLock --graceTime 5000 --ksldfd 38 QSocketNotifier: Invalid socket 38 and type 'Read', disabling... OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2) OpenGL version string: 3.0 Mesa 18.0.5 OpenGL shading language version string: 1.30 Driver: Intel GPU class: Unknown OpenGL version: 3.0 GLSL version: 1.30 Mesa version: 18.0.5 Linux kernel version: 4.15 Requires strict binding: yes GLSL shaders: yes Texture NPOT support: yes Virtual Machine: no kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" Locked at 1540015175 kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" kf5.kpackage: No metadata file in the package, expected it at: "/media/hdd/users/ccheney/Downloads/" UdevQt: unable to create udev monitor connection Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile file:///usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile QObject::connect: invalid null parameter QObject::connect: invalid null parameter QObject::connect: invalid null parameter QObject::connect: invalid null parameter QObject::connect: invalid null parameter Segmentation fault
I have a similar issue. In my case it happens when I click the password field of the greeter screen. I have SDDM configured to auto-login to my user account, so I log out to get back to the login screen first, in case that makes a difference. System: Host: rupert Kernel: 4.15.0-36-generic x86_64 bits: 64 gcc: 7.3.0 Desktop: KDE Plasma 5.14.1 (Qt 5.11.2) Distro: KDE neon User Edition 5.14 Machine: Device: desktop Mobo: MSI model: X99S SLI PLUS (MS-7885) v: 1.0 serial: N/A UEFI: American Megatrends v: 1.E0 date: 06/15/2018 CPU: 6 core Intel Core i7-5820K (-MT-MCP-) arch: Haswell rev.2 cache: 15360 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 39603 clock speeds: max: 3600 MHz 1: 1200 MHz 2: 1200 MHz 3: 1200 MHz 4: 1211 MHz 5: 1204 MHz 6: 1200 MHz 7: 1200 MHz 8: 1200 MHz 9: 1200 MHz 10: 1567 MHz 11: 1207 MHz 12: 1200 MHz Graphics: Card: Advanced Micro Devices [AMD/ATI] Vega [Radeon RX Vega] bus-ID: 05:00.0 Display Server: x11 (X.Org 1.19.6 ) drivers: ati,amdgpu (unloaded: modesetting,fbdev,vesa,radeon) Resolution: 3840x2160@60.00hz, 3840x2160@60.00hz OpenGL: renderer: Radeon RX Vega (VEGA10 / DRM 3.23.0 / 4.15.0-36-generic, LLVM 6.0.0) version: 4.5 Mesa 18.0.5 Direct Render: Yes Audio: Card-1 Advanced Micro Devices [AMD/ATI] Device aaf8 driver: snd_hda_intel bus-ID: 05:00.1 Card-2 Intel C610/X99 series HD Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 Sound: Advanced Linux Sound Architecture v: k4.15.0-36-generic Network: Card: Intel Ethernet Connection (2) I218-V driver: e1000e v: 3.2.6-k port: f020 bus-ID: 00:19.0 IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter> Drives: HDD Total Size: 500.1GB (29.4% used) ID-1: /dev/sda model: Samsung_SSD_840 size: 500.1GB Partition: ID-1: / size: 457G used: 137G (32%) fs: ext4 dev: /dev/sda2 RAID: No RAID devices: /proc/mdstat, md_mod kernel module present Sensors: System Temperatures: cpu: 35.0C mobo: N/A gpu: 40.0 Fan Speeds (in rpm): cpu: N/A Info: Processes: 279 Uptime: 9 min Memory: 2103.9/11905.9MB Init: systemd runlevel: 5 Gcc sys: 7.3.0 Client: Shell (bash 4.4.191) inxi: 2.3.56 Logs from journalctl: Oct 20 18:07:26 rupert systemd[1]: Started User Manager for UID 117. Oct 20 18:07:26 rupert sddm[903]: Greeter session started successfully Oct 20 18:07:26 rupert sddm-greeter[2148]: High-DPI autoscaling not Enabled Oct 20 18:07:26 rupert sddm-greeter[2148]: Loading theme configuration from "/usr/share/sddm/themes/breeze/theme.conf" Oct 20 18:07:26 rupert sddm-greeter[2148]: Reading from "/usr/share/xsessions/plasma.desktop" Oct 20 18:07:26 rupert sddm-greeter[2148]: Reading from "/usr/share/wayland-sessions/plasmawayland.desktop" Oct 20 18:07:26 rupert sddm-greeter[2148]: Connected to the daemon. Oct 20 18:07:26 rupert sddm[903]: Message received from greeter: Connect Oct 20 18:07:26 rupert sddm-greeter[2148]: Loading file:///usr/share/sddm/themes/breeze/Main.qml... Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject::installEventFilter(): Cannot filter events for objects in a different thread. Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert dbus-daemon[2164]: [session uid=117 pid=2162] AppArmor D-Bus mediation is enabled Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject: Cannot create children for a parent that is in a different thread. (Parent is SDDM::GreeterApp(0x7fffa09028f0), parent's thread is QThread(0x560a44709020), current thread is QThread(0x560a449563c0) Oct 20 18:07:26 rupert sddm-greeter[2148]: QObject::installEventFilter(): Cannot filter events for objects in a different thread. Oct 20 18:07:26 rupert sddm-greeter[2148]: Cannot watch QRC-like path ":/icons/hicolor/index.theme" Oct 20 18:07:26 rupert sddm-greeter[2148]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable Oct 20 18:07:26 rupert sddm-greeter[2148]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile Oct 20 18:07:26 rupert sddm-greeter[2148]: Adding view for "DisplayPort-0" QRect(0,0 3840x2160) Oct 20 18:07:26 rupert sddm-greeter[2148]: Loading file:///usr/share/sddm/themes/breeze/Main.qml... Oct 20 18:07:26 rupert sddm-greeter[2148]: file:///usr/share/sddm/themes/breeze/components/VirtualKeyboard.qml:22:1: Type InputPanel unavailable Oct 20 18:07:26 rupert sddm-greeter[2148]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile Oct 20 18:07:26 rupert sddm-greeter[2148]: Adding view for "DisplayPort-1" QRect(3840,0 3840x2160) Oct 20 18:07:26 rupert sddm-greeter[2148]: Message received from daemon: Capabilities Oct 20 18:07:26 rupert sddm-greeter[2148]: Message received from daemon: HostName Oct 20 18:07:27 rupert sddm-greeter[2148]: qrc:/QtQuick/VirtualKeyboard/content/InputPanel.qml: File was compiled ahead of time with an incompatible version of Qt and the original file cannot be found. Please recompile Oct 20 18:07:27 rupert sddm-greeter[2148]: QObject::connect: invalid null parameter Oct 20 18:07:31 rupert sddm-greeter[2148]: QObject::connect: invalid null parameter Oct 20 18:07:31 rupert sddm-greeter[2148]: QObject::connect: invalid null parameter Oct 20 18:07:31 rupert sddm-greeter[2148]: QObject::connect: invalid null parameter Oct 20 18:07:31 rupert sddm-greeter[2148]: QObject::connect: invalid null parameter Oct 20 18:07:31 rupert kernel: [drm] HBR2x4 pass VS=2, PE=0 Oct 20 18:07:31 rupert kernel: show_signal_msg: 15 callbacks suppressed Oct 20 18:07:31 rupert kernel: sddm-greeter[2148]: segfault at 8 ip 00007fb4871e9930 sp 00007fffa0901d58 error 4 in libqtvirtualkeyboardplugin.so[7fb4871be000+299000] Oct 20 18:07:31 rupert sddm-helper[2134]: [PAM] Closing session Oct 20 18:07:31 rupert sddm-helper[2134]: pam_unix(sddm-greeter:session): session closed for user sddm Oct 20 18:07:31 rupert sddm-helper[2134]: [PAM] Ended. Oct 20 18:07:31 rupert sddm[903]: Auth: sddm-helper exited with 11 Oct 20 18:07:31 rupert sddm[903]: Greeter stopped. Oct 20 18:07:31 rupert systemd[1]: session-4.scope: Killing process 2163 (dbus-launch) with signal SIGTERM. Oct 20 18:07:31 rupert systemd[1]: session-4.scope: Killing process 2164 (dbus-daemon) with signal SIGTERM. Oct 20 18:07:31 rupert systemd[1]: Stopping Session 4 of user sddm. Oct 20 18:07:31 rupert systemd[1]: Stopped Session 4 of user sddm. Oct 20 18:07:31 rupert systemd-logind[783]: Removed session 4. Oct 20 18:07:31 rupert systemd[1]: Stopping User Manager for UID 117... Oct 20 18:07:31 rupert systemd[2137]: Stopped target Default. Oct 20 18:07:31 rupert systemd[2137]: Stopped target Basic System. Oct 20 18:07:31 rupert systemd[2137]: Stopped target Paths. Oct 20 18:07:31 rupert systemd[2137]: Stopped target Timers. Oct 20 18:07:31 rupert systemd[2137]: Stopped target Sockets. Oct 20 18:07:31 rupert systemd[2137]: Closed GnuPG network certificate management daemon. Oct 20 18:07:31 rupert systemd[2137]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers). Oct 20 18:07:31 rupert systemd[2137]: Closed GnuPG cryptographic agent and passphrase cache (restricted). Oct 20 18:07:31 rupert systemd[2137]: Closed GnuPG cryptographic agent and passphrase cache. Oct 20 18:07:31 rupert systemd[2137]: Closed GnuPG cryptographic agent (ssh-agent emulation). Oct 20 18:07:31 rupert systemd[2137]: Reached target Shutdown. Oct 20 18:07:31 rupert systemd[2137]: Starting Exit the Session... Oct 20 18:07:31 rupert systemd[2137]: Received SIGRTMIN+24 from PID 2172 (kill). Oct 20 18:07:31 rupert systemd[1]: Stopped User Manager for UID 117. Oct 20 18:07:31 rupert systemd[1]: Removed slice User Slice of sddm.
My issue also started today, after the update of Qt to 5.11.2. It happens whether the Plasma or the Plasma Wayland session is selected. I was going to file a bug for SDDM, but couldn't find it (is it not a KDE project?).
Please get a backtrace of the crash though it'll almost certainly be your graphics drivers, so please check them
How do you get a core/backtrace from kscreenlocker_greet? I tried running ulimit -c unlimited in neon and then the program but it still didn't create a core file when I ran kscrenlocker_greet from the command line.
Also while it is possible it is the video driver that is the problem no xorg packages have been updated since Sept 25, but the problem didn't show up until the large set of KDE updates on Oct 19.
I just noticed a big Qt update got pushed to neon today which fixed the problem. Apparently KDE/Qt updates are very fragile, and is not reflected by soname updates. :-\
I too can confirm the issue is fixed since the second batch of Qt updates.
Thanks for reporting back