4.18 kernel memory leak (eats RAM)

[Edgar Cherkasov]

After updates I have noticed that kernel eats memory of system, e.g. after few hours of use:
$ smem -tw
Area Used Cache Noncache
firmware/hardware 0 0 0
kernel image 0 0 0
kernel dynamic memory 3171052 386548 2784504
userspace memory 3675632 449152 3226480
free memory 213776 213776 0
----------------------------------------------------------
                            7060460 1049476 6010984

kernel has spent ~3G of ram. Looks like abnormal behavior. Can be fixed only by rebooting.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-generic 4.15.0.46.48
ProcVersionSignature: Ubuntu 4.18.0-16.17~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-16-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: edgar 2053 F.... pulseaudio
 /dev/snd/controlC0: edgar 2053 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 26 17:01:16 2019
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=a2084e77-daf0-465f-b09a-9694a03a3b26
InstallationDate: Installed on 2016-05-07 (1053 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: ASUSTeK COMPUTER INC. X555YI
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic root=UUID=6947b781-942c-4c6e-810a-997d674d4b3b ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.18.0-16-generic N/A
 linux-backports-modules-4.18.0-16-generic N/A
 linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-11-03 (143 days ago)
dmi.bios.date: 01/19/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X555YI.701
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X555YI
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX555YI.701:bd01/19/2017:svnASUSTeKCOMPUTERINC.:pnX555YI:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX555YI:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: X
dmi.product.name: X555YI
dmi.product.sku: ASUS-NotebookSKU
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.