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https://bugs.launchpad.net/bugs/1861359
Title:
swap storms kills interactive use
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Released
Bug description:
[Impact]
The i915 shrinker can make the system unresponsive and kill
interactive performance by swapping out dirty objects to reclaim more
memory.
[Test case]
The problem can be easily reproduced running an I/O intensive writer,
for example:
$ dd if=/dev/zero of=/tmp/zero bs=1G count=32
When the system is running out of memory and the i915 shrinker is
called we can experience noticeable lags in the normal interactive
activities (mouse not responding for 5-10 seconds, screen not
refreshing, etc.).
[Fix]
Avoid the lags by preventing to swap out dirty objects in the i915
shrinker (other cached objects can still be reclaimed).
[Regression potential]
The right fix would be to backport commit 2850748ef876 ("drm/i915:
Pull i915_vma_pin under the vm->mutex"), available in v5.5+. However
the backport is not trivial and the risk to introduce other bugs is
high.
A simple change like this (it's basically a one-liner that removes a
flag) can be a reasonable compromise to prevent the problem and avoid
the risk of introducing other bugs.
[Original report]
Hello, several times since upgrading to focal from 19.04 I've found my
computer entirely unresponsive for periods of twenty or thirty
seconds. No mouse movement, no keyboard input, the screen output does
not change.
My computer was using swap space and despite very slow writeout speeds
well below what the NVME drive can handle, the computer was unusable.
I've captured some vmstat 1 output and top output that I started
collecting during the event. (Normally one very long painful period is
followed by several shorter periods of uselessness.)
Thanks
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-12-generic 5.4.0-12.15
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
Date: Wed Jan 29 23:44:05 2020
ProcEnviron:
TERM=rxvt-unicode-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-5.4
UpgradeStatus: Upgraded to focal on 2020-01-24 (5 days ago)
---
ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k5.4.0-12-generic.
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: sarnold 2734 F.... pulseaudio
/dev/snd/controlC1: sarnold 2734 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0x2fe1028000 irq 145'
Mixer name : 'Realtek ALC285'
Components : 'HDA:10ec0285,17aa225c,00100002
HDA:8086280b,80860101,00100000'
Controls : 53
Simple ctrls : 15
Card1.Amixer.info:
Card hw:1 'Audio'/'Generic ThinkPad Dock USB Audio at
usb-0000:00:14.0-4.2.4, high speed'
Mixer name : 'USB Mixer'
Components : 'USB17ef:306f'
Controls : 9
Simple ctrls : 4
DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=none
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: LENOVO 20KHCTO1WW
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: linux (not installed)
ProcEnviron:
TERM=rxvt-unicode-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu@/vmlinuz-5.4.0-12-generic
root=ZFS=rpool/ROOT/ubuntu ro root=ZFS=rpool/ROOT/ubuntu quiet splash
acpi_osi=! "acpi_osi=Windows 2015" vt.handoff=1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
RelatedPackageVersions:
linux-restricted-modules-5.4.0-12-generic N/A
linux-backports-modules-5.4.0-12-generic N/A
linux-firmware 1.185
Tags: focal
Uname: Linux 5.4.0-12-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-01-24 (5 days ago)
UserGroups: adm cdrom libvirt lpadmin plugdev sambashare sbuild sudo
_MarkForUpload: True
dmi.bios.date: 11/25/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET69W (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN23ET69W(1.44):bd11/25/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KHCTO1WW
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO
---
ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k5.4.0-12-generic.
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: sarnold 2734 F.... pulseaudio
/dev/snd/controlC1: sarnold 2734 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0x2fe1028000 irq 145'
Mixer name : 'Realtek ALC285'
Components : 'HDA:10ec0285,17aa225c,00100002
HDA:8086280b,80860101,00100000'
Controls : 53
Simple ctrls : 15
Card1.Amixer.info:
Card hw:1 'Audio'/'Generic ThinkPad Dock USB Audio at
usb-0000:00:14.0-4.2.4, high speed'
Mixer name : 'USB Mixer'
Components : 'USB17ef:306f'
Controls : 9
Simple ctrls : 4
DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=none
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: LENOVO 20KHCTO1WW
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: linux (not installed)
ProcEnviron:
TERM=rxvt-unicode-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu@/vmlinuz-5.4.0-12-generic
root=ZFS=rpool/ROOT/ubuntu ro root=ZFS=rpool/ROOT/ubuntu quiet splash
acpi_osi=! "acpi_osi=Windows 2015" vt.handoff=1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
RelatedPackageVersions:
linux-restricted-modules-5.4.0-12-generic N/A
linux-backports-modules-5.4.0-12-generic N/A
linux-firmware 1.185
Tags: focal
Uname: Linux 5.4.0-12-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-01-24 (5 days ago)
UserGroups: adm cdrom libvirt lpadmin plugdev sambashare sbuild sudo
_MarkForUpload: True
dmi.bios.date: 11/25/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N23ET69W (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20KHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN23ET69W(1.44):bd11/25/2019:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 6th
dmi.product.name: 20KHCTO1WW
dmi.product.sku: LENOVO_MT_20KH_BU_Think_FM_ThinkPad X1 Carbon 6th
dmi.product.version: ThinkPad X1 Carbon 6th
dmi.sys.vendor: LENOVO
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