This bug was fixed in the package linux - 5.4.0-146.163

---------------
linux (5.4.0-146.163) focal; urgency=medium

  * focal/linux: 5.4.0-146.163 -proposed tracker (LP: #2012094)

  * NFS deathlock with last Kernel 5.4.0-144.161 and 5.15.0-67.74 (LP: #2009325)
    - NFS: Correct timing for assigning access cache timestamp

linux (5.4.0-145.162) focal; urgency=medium

  * focal/linux: 5.4.0-145.162 -proposed tracker (LP: #2008389)

  * [SRU]Update ice driver to support E823 devices (LP: #1986717)
    - ice: Add device ids for E822 devices
    - ice: add support for E823 devices

  * btrfs/154: rename fails with EOVERFLOW when calculating item size during
    item key collision (LP: #2004132)
    - btrfs: correctly calculate item size used when item key collision happens

  * rtcpie in timers from ubuntu_kernel_selftests randomly failing
    (LP: #1814234)
    - SAUCE: selftest: rtcpie: Force passing unreliable subtest

  * [UBUNTU 20.04] KVM: s390: pv: don't allow userspace to set the clock under
    PV - kernel part (LP: #1999882)
    - KVM: s390x: fix SCK locking
    - KVM: s390: pv: don't allow userspace to set the clock under PV

  * CVE-2021-3669
    - ipc: replace costly bailout check in sysvipc_find_ipc()

  * net:fcnal-test.sh 'nettest' command not found on F/K (LP: #2006391)
    - selftests/net: Find nettest in current directory

  * xfs: Preallocated ioend transactions cause deadlock due to log buffer
    exhaustion (LP: #2007219)
    - xfs: drop submit side trans alloc for append ioends

  * CVE-2022-4382
    - USB: gadgetfs: Fix race between mounting and unmounting

  * CVE-2022-2196
    - KVM: VMX: Execute IBPB on emulated VM-exit when guest has IBRS

  * ubuntu_kernel_selftests: net:udpgso_bench.sh failed (LP: #1951447)
    - selftests: net: udpgso_bench: Fix racing bug between the rx/tx programs

  * net:fcnal-test.sh didn't return a non-zero value even with some sub-tests
    failed (LP: #2006692)
    - selftests: net/fcnal-test.sh: add exit code

  * Fix selftests/ftracetests/Meta-selftests in Focal (LP: #2006453)
    - SAUCE: Fix ftrace/Meta-selftests bashism check

  * CVE-2023-23559
    - wifi: rndis_wlan: Prevent buffer overflow in rndis_query_oid

 -- Luke Nowakowski-Krijger <luke.nowakowskikrij...@canonical.com>  Fri,
17 Mar 2023 11:08:20 -0700

** Changed in: linux (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-3669

** Changed in: linux-aws (Ubuntu Focal)
       Status: Fix Committed => Fix Released

-- 
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https://bugs.launchpad.net/bugs/2009325

Title:
  NFS deathlock with last Kernel 5.4.0-144.161 and 5.15.0-67.74

Status in linux package in Ubuntu:
  In Progress
Status in linux-aws package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Committed
Status in linux-aws source package in Bionic:
  Fix Committed
Status in linux source package in Focal:
  Fix Released
Status in linux-aws source package in Focal:
  Fix Released
Status in linux source package in Jammy:
  Fix Released
Status in linux-aws source package in Jammy:
  Fix Released
Status in linux source package in Kinetic:
  Fix Released
Status in linux-aws source package in Kinetic:
  Fix Released
Status in linux source package in Lunar:
  In Progress
Status in linux-aws source package in Lunar:
  Invalid

Bug description:
  After updating on the kernel 
  5.4.0-144.161 at Ubuntu 18 and 
  5.15.0-67.74 at Ubuntu 20, 
  we have a 100% CPU outlation and 20 to 30 Mbit traffic to the clients for our 
NFS servers.

  All clients are extremely slow when it comes to access to the NFS
  resources.

  Restart and use older kernel, fixed the problem.
  Ubuntu 18 5.4.0-139-generic
  Ubuntu 20 5.15.0-60-Generic
  I don't have a NFS problem with this kernel.

  Problem came with the last releas on March 3rd, 2023
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mär  4 15:00 seq
   crw-rw---- 1 root audio 116, 33 Mär  4 15:00 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu27.25
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CasperMD5CheckResult: skip
  DistroRelease: Ubuntu 20.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  Lsusb-t:
   
  Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
  MachineType: VMware, Inc. VMware Virtual Platform
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-67-generic 
root=/dev/mapper/vg1-root ro net.ifnames=0 biosdevname=0 kvm.nx_huge_pages=auto 
elevator=noop
  ProcVersionSignature: Ubuntu 5.15.0-67.74~20.04.1-generic 5.15.85
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-67-generic N/A
   linux-backports-modules-5.15.0-67-generic  N/A
   linux-firmware                             1.187.36
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  Tags:  focal
  Uname: Linux 5.15.0-67-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True
  dmi.bios.date: 11/12/2020
  dmi.bios.release: 4.6
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.ec.firmware.release: 0.0
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd11/12/2020:br4.6:efr0.0:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:sku:
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mär  4 15:03 seq
   crw-rw---- 1 root audio 116, 33 Mär  4 15:03 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.28
  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:
  DistroRelease: Ubuntu 18.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: VMware, Inc. VMware Virtual Platform
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-43-generic 
root=/dev/mapper/vg1-root ro net.ifnames=0 biosdevname=0 kvm.nx_huge_pages=auto 
elevator=noop
  ProcVersionSignature: Ubuntu 5.0.0-43.47~18.04.1-generic 5.0.21
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-43-generic N/A
   linux-backports-modules-5.0.0-43-generic  N/A
   linux-firmware                            1.173.21
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 5.0.0-43-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 12/12/2018
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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