Public bug reported:

I ran a zpool scrub prior to upgrading my 18.04 to the latest HWE kernel
(5.3.0-26-generic #28~18.04.1-Ubuntu) and it ran properly:

eric@eric-8700K:~$ zpool status
  pool: storagepool1
 state: ONLINE
  scan: scrub repaired 1M in 4h21m with 0 errors on Fri Jan 17 07:01:24 2020
config:

        NAME                                          STATE     READ WRITE CKSUM
        storagepool1                                  ONLINE       0     0     0
          mirror-0                                    ONLINE       0     0     0
            ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M3YFRVJ3  ONLINE       0     0     0
            ata-ST2000DM001-1CH164_Z1E285A4           ONLINE       0     0     0
          mirror-1                                    ONLINE       0     0     0
            ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M1DSASHD  ONLINE       0     0     0
            ata-ST2000DM006-2DM164_Z4ZA3ENE           ONLINE       0     0     0


I ran zpool scrub after upgrading the kernel and rebooting, and now it
fails to work properly. It appeared to finish in about 5 minutes but did
not, and says it is going slow:


eric@eric-8700K:~$ sudo zpool status
  pool: storagepool1
 state: ONLINE
  scan: scrub in progress since Fri Jan 17 15:32:07 2020
        1.89T scanned out of 1.89T at 589M/s, (scan is slow, no estimated time)
        0B repaired, 100.00% done
config:

        NAME                                          STATE     READ WRITE CKSUM
        storagepool1                                  ONLINE       0     0     0
          mirror-0                                    ONLINE       0     0     0
            ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M3YFRVJ3  ONLINE       0     0     0
            ata-ST2000DM001-1CH164_Z1E285A4           ONLINE       0     0     0
          mirror-1                                    ONLINE       0     0     0
            ata-WDC_WD20EZRZ-00Z5HB0_WD-WCC4M1DSASHD  ONLINE       0     0     0
            ata-ST2000DM006-2DM164_Z4ZA3ENE           ONLINE       0     0     0

errors: No known data errors

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: zfsutils-linux 0.7.5-1ubuntu16.7
ProcVersionSignature: Ubuntu 5.3.0-26.28~18.04.1-generic 5.3.13
Uname: Linux 5.3.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 17 16:22:01 2020
InstallationDate: Installed on 2018-03-07 (681 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
SourcePackage: zfs-linux
UpgradeStatus: Upgraded to bionic on 2018-08-02 (533 days ago)
modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Permission 
denied: '/etc/sudoers.d/zfs']

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic wayland-session

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https://bugs.launchpad.net/bugs/1860182

Title:
  zpool scrub malfunction after kernel upgrade

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