** Changed in: zfs-linux (Ubuntu Bionic)
       Status: New => Fix Committed

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

Title:
  zpool scrub malfunction after kernel upgrade

Status in zfs-linux package in Ubuntu:
  In Progress
Status in zfs-linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Request [BIONIC] ==

  The HWE kernel on bionic provides zfs 0.8.1 driver which includes an
  improved scrub however, the progress stats reported by the kernel are
  incompatible to the 0.7.x zfs driver.

  == Fix ==

  Use the new zfs 8.x pool_scan_stat_t extra fields to calculate
  the scan progress when using zfs 8.x kernel drivers. Add detection of the 
kernel module version and use an approximation to the zfs 0.8.0 progress and 
rate reporting for newer kernels.

  For 0.7.5 we can pass the larger 8.x port_scan_stat_t to 0.7.5
  zfs w/o problems and ignore these new fields and continue
  to use the 0.7.5 rate calculations. 

  == Test ==

  Install the HWE kernel on Bionic, create some large ZFS pools and
  populate with a lot of data.  Issue:

  sudo zpool scrub poolname
  and then look at the progress using

  sudo zpool status

  Without the fix, the progress stats are incorrect. With the fix the
  duration and rate stats as a fairly good approximation of the
  progress. Since the newer 0.8.x zfs does scanning now in two phases
  the older zfs tools will only report accurate stats for phase #2 of
  the scan to keep it roughly compatible with the 0.7.x zfs utils
  output.

  == Regression Potential ==

  This is a userspace reporting fix so the zpool status output is only
  affected by this fix when doing a scrub, so the impact of this fix is
  very small and limited.

  ------------------------------------

  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']

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