I've hit this bug on a non-encrypted pool. FS scrub also reported no
errors for me. I'm currently on Kernel 5.11.0-37-generic / zfs libs
2.0.2-1ubuntu5.2 (Hirsute), though the corruption may have occurred on a
previous kernel / library. The directory which is triggering the hang
for me was created Jun 7 of this year so it appears to be recent
problem. I've identified the corrupted directory and moved it out of the
way (fortunately is contains nothing important), but I'm unable to
delete it from the filesystem. Any attempts to read or delete the
directory hangs. Setting zfs_recovery=1 does not help. The only way I
can recover from hang is to reboot. I'd like to know if there is any way
to get rid of the corrupted directory other than having to create a new
filesystem and copy over all the other files / dirs except the problem
one?

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https://bugs.launchpad.net/bugs/1931660

Title:
  PANIC at zfs_znode.c:339:zfs_znode_sa_init()

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm seeing a non-deterministic panic in the ZFS code. Last boot, this
  occurred in systemd-udevd, resulting in a failed boot. The boot before
  that, firefox hit the same thing, and this boot it looks like it's hit
  an Evolution component.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: linux-image-5.11.0-18-generic 5.11.0-18.19+21.10.1
  ProcVersionSignature: Ubuntu 5.11.0-18.19+21.10.1-generic 5.11.17
  Uname: Linux 5.11.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu67
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      4988 F.... pulseaudio
   /dev/snd/controlC1:  chris      4988 F.... pulseaudio
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jun 11 11:49:47 2021
  InstallationDate: Installed on 2021-05-13 (28 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  MachineType: Dell Inc. XPS 15 9575
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_z8j7yc@/vmlinuz-5.11.0-18-generic 
root=ZFS=rpool/ROOT/ubuntu_z8j7yc ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-5.11.0-18-generic N/A
   linux-backports-modules-5.11.0-18-generic  N/A
   linux-firmware                             1.198
  SourcePackage: linux
  UpgradeStatus: Upgraded to impish on 2021-05-13 (28 days ago)
  dmi.bios.date: 07/07/2019
  dmi.bios.release: 1.7
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.7.1
  dmi.board.name: 0C32VW
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 31
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.7.1:bd07/07/2019:br1.7:svnDellInc.:pnXPS159575:pvr:rvnDellInc.:rn0C32VW:rvrA00:cvnDellInc.:ct31:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9575
  dmi.product.sku: 080D
  dmi.sys.vendor: Dell Inc.

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