Commit 55237a5f has already been applied in Bionic kernel,
https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/commit/?id=02f4976643b29ebe7d93e79cd468cd41442af560

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https://bugs.launchpad.net/bugs/1828438

Title:
  btrfs memory leak on bionic

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On bionic kernel with btrfs mounted, kernfs_node_cache grows
  constantly.

  About 7MB/hour of unreclaimable memory growth was observed on my
  x86_64 system with btrfs root partition, kernel 4.15.0-48-generic
  #51-Ubuntu SMP Wed Apr 3 08:28:49 UTC 2019 x86_64 x86_64 x86_64
  GNU/Linux.

  * disco is not affected. (kernel 5.0.0-13-generic)
  * bionic without btrfs is not affected. (on ext4 root partition)

  Possible related commit regarding memory leak found here
  
https://github.com/torvalds/linux/commit/55237a5f2431a72435e3ed39e4306e973c0446b7

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-48-generic 4.15.0-48.51
  ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
  Uname: Linux 4.15.0-48-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May  9 21:39 seq
   crw-rw---- 1 root audio 116, 33 May  9 21:39 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Fri May 10 01:15:58 2019
  HibernationDevice: RESUME=/dev/mapper/ctl-swap
  InstallationDate: Installed on 2017-03-19 (781 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-48-generic 
root=/dev/mapper/ctl-root ro rootflags=subvol=@
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-48-generic N/A
   linux-backports-modules-4.15.0-48-generic  N/A
   linux-firmware                             1.173.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-05-11 (362 days ago)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: rel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-3.0
  dmi.modalias: 
dmi:bvnSeaBIOS:bvrrel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-3.0:cvnQEMU:ct1:cvrpc-i440fx-3.0:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-3.0
  dmi.sys.vendor: QEMU

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