I have this problem as well on Cinnamon, so it doesn't appear to be
specific to KDE. It stalls often and frequently over 15-30 seconds at a
time for no apparent reason. But the swapping to disk may be a clue.
I see this on 5.4.0-40 and have also tried with the lowlatency version
of the kernel and it doesn't help.
One thing that seems to reduce the frequency of the problem somewhat is
to disable transparent_hugepage support but it still happens even after
that.
I have 32GB ram and it starts happening when I get to about 50% ram (mem
available) usage. The system also appears to start swapping at that
point despite what swappiness is set to. I tried setting it to 10 but it
is still swapping at what appears to be ~ 50% usage.
It appears to be very easy to reproduce if you run a few VMware VMs on a
system.
# cat /proc/sys/vm/swappiness
10
$ free -m
total used free shared buff/cache available
Mem: 31030 6591 246 9050 24192 14936
Swap: 32767 4942 27825
$ cat /proc/meminfo
MemTotal: 31774792 kB
MemFree: 256768 kB
MemAvailable: 15324804 kB
Buffers: 5887324 kB
Cached: 16712984 kB
SwapCached: 488276 kB
Active: 19816476 kB
Inactive: 8835508 kB
Active(anon): 12801324 kB
Inactive(anon): 2522936 kB
Active(file): 7015152 kB
Inactive(file): 6312572 kB
Unevictable: 145612 kB
Mlocked: 48 kB
SwapTotal: 33554428 kB
SwapFree: 28493052 kB
Dirty: 2301336 kB
Writeback: 9564 kB
AnonPages: 6161528 kB
Mapped: 7931416 kB
Shmem: 9272240 kB
KReclaimable: 2201904 kB
Slab: 2451272 kB
SReclaimable: 2201904 kB
SUnreclaim: 249368 kB
KernelStack: 21552 kB
PageTables: 85272 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 49441824 kB
Committed_AS: 30098296 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 55400 kB
VmallocChunk: 0 kB
Percpu: 7712 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
DirectMap4k: 5078656 kB
DirectMap2M: 27346944 kB
DirectMap1G: 0 kB
** Changed in: linux (Ubuntu)
Status: Invalid => Confirmed
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https://bugs.launchpad.net/bugs/1852001
Title:
KDE GUI freeze on high disk IO
Status in linux package in Ubuntu:
Confirmed
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
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