attached "ps auxw" while GUI was freezed. kernel 5.4.1-050401-generic no swap I restarted GUI using /etc/init.d/sddm restart right now only the KDE taskbar and menu are locked, Alt-Tab and programs still work. (this is a rather new phenomena) I already experienced this once, where some programs were freezed too (eg libreoffice) and others weren't. I only got a message like "program does not answer, force close it"? maybe this is a second hand problem as some inter-process communication locks apps when KDE is locked?
after about 5 minutes KDE bar crashed and restarted. now works. from syslog while KDE bar locked: pulseaudio[30539]: E: [pulseaudio] bluez5-util.c: GetManagedObjects() failed: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. ... PackageKit: daemon quit systemd[1]: packagekit.service: Main process exited, code=killed, status=15/TERM systemd[1]: packagekit.service: Succeeded. ... dbus-daemon[1772]: [system] Activating via systemd: service name='org.freedesktop.PackageKit' unit='packagekit.service' requested by ':1.679' (uid=1000 pid=32050 comm="/usr/bin/plasmashell ") systemd[1]: Starting PackageKit Daemon... PackageKit: daemon start dbus-daemon[1772]: [system] Successfully activated service 'org.freedesktop.PackageKit' systemd[1]: Started PackageKit Daemon. ** Attachment added: "processes.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852001/+attachment/5310701/+files/processes.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1852001 Title: KDE GUI freeze on high disk IO, but disabling swap fixes it Status in linux package in Ubuntu: Incomplete Bug description: I've got massive problems with GUI on my PC. The attached logs are from the following setting: - high disk load (f3write) - kernel 4.15.0-1050-oem (the only 4x kernel available in eoan) - no swap available These are the parameters (disk load, kernel, swap) I am fiddling with to find out the cause, see below. In general - the problem happens once a day with any 5.0 or 5.3 kernel from eoan repo - more likely to happen with high disk or CPU load, but not necessarily. - less likely with the 4.x kernel mentioned above. I just installed the following kernels from kernel-ppa: 5.3.10-050310-generic 5.4.0-050400rc6-generic 5.4.0-997-generic (drm-intel-next) Now I am waiting for the freeze to occur again. The problem started about half a year ago. There have been three changes that happened at the time and could be the cause - switch to kernel 5.x - update to Ubuntu 19.4 - swapped motherboard, CPU and RAM. The hassle started with the following scenario, repeated often: - high disk load - PC becomes laggy - soon dies/freezes The longer I waited, the deeper the lockdown went. but I don't know the exact details. The first cause I found was kswapd running amok and take the system with it. Workaround: add swap space. Now the problem shifted: Whenever I got high disk load (eg dd 100 GB of data) the kernel swaps likle crazy and makes the GUI first lag soon freeze. but no excessive CPU load any more, as kswapd does not go crazy. Again I found a workaround: the above mentioned 4.x kernel. In this case the GUI lags as expected from a heavily swapping system. nothing more. but still sometimes the GUI simply freezes (the error reported at the top) Another workaround is to completely remove swap. Let's see what happens, if kswapd goes amok again. I am not sure as how these problems are related. I did extensive hardware check like - memtest86 newest version, no "may be vulnerable to high frequency row hammering" - smart do you suggest any burn in test suites? thanks ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: xorg 1:7.7+19ubuntu12 ProcVersionSignature: Ubuntu 4.15.0-1050.57-oem 4.15.18 Uname: Linux 4.15.0-1050-oem x86_64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 Date: Sun Nov 10 15:55:14 2019 DistUpgraded: 2019-10-19 13:35:30,394 DEBUG entry '# deb http://ppa.launchpad.net/brandonsnider/cdrtools/ubuntu cosmic main # disabled on upgrade to eoan' was disabled (unknown mirror) DistroCodename: eoan DistroVariant: ubuntu DkmsStatus: virtualbox, 6.0.14, 5.3.0-18-generic, x86_64: installed virtualbox, 6.0.14, 5.3.0-19-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation UHD Graphics 630 (Desktop 9 Series) [8086:3e98] (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] UHD Graphics 630 (Desktop 9 Series) [1462:7b16] InstallationDate: Installed on 2017-12-16 (693 days ago) InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1) MachineType: Micro-Star International Co., Ltd. MS-7B16 ProcEnviron: LANGUAGE=en_US:en TERM=linux PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1050-oem root=UUID=ca93bfbd-335a-4cc7-9d0f-f0da18447497 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display Title: Xorg freeze UpgradeStatus: Upgraded to eoan on 2019-10-19 (22 days ago) dmi.bios.date: 08/13/2019 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2.80 dmi.board.asset.tag: Default string dmi.board.name: B360 GAMING PRO CARBON (MS-7B16) dmi.board.vendor: Micro-Star International Co., Ltd. dmi.board.version: 1.0 dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Micro-Star International Co., Ltd. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.80:bd08/13/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B16:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB360GAMINGPROCARBON(MS-7B16):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0: dmi.product.family: Default string dmi.product.name: MS-7B16 dmi.product.version: 1.0 dmi.sys.vendor: Micro-Star International Co., Ltd. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.99-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1 version.libgl1-mesa-glx: libgl1-mesa-glx 19.2.1-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852001/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
