** Changed in: zfs-linux (Ubuntu)
     Assignee: Dimitri John Ledkov (xnox) => (unassigned)

** Changed in: zfs-linux (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1881810

Title:
  ZFS import cause panic

Status in zfs-linux package in Ubuntu:
  Invalid

Bug description:
  1)
  Ubuntu 20.04 LTS

  2)
  apt policy zfsutils-linux
  zfsutils-linux:
  Installed: 0.8.3-1ubuntu12
  Candidate:    0.8.3-1ubuntu12

  3)
  ZFS pool not possible to import, unless using read only.
  If trying to import normal way as write/read, casing panic message

  Expected to be able to import zpool without panic.
  Expected that scrub should not be able to run in read only.
  Expected that somehow be able to restore the zpool somehow.


  
  4)
  # zpool status
  no pools available
  # zpool import
     pool: datastore
       id: 3190464655986727485
    state: ONLINE
   status: Some supported features are not enabled on the pool.
   action: The pool can be imported using its name or numeric identifier, though
          some features will not be available without an explicit 'zpool 
upgrade'.
   config:

          datastore   ONLINE
            raidz2-0  ONLINE
              sdb     ONLINE
              sdc     ONLINE
              sdd     ONLINE
              sde     ONLINE
              sdf     ONLINE
              sdg     ONLINE

  # zpool import -o readonly=on datastore
  # zpool status
    pool: datastore
   state: ONLINE
  status: Some supported features are not enabled on the pool. The pool can
          still be used, but some features are unavailable.
  action: Enable all features using 'zpool upgrade'. Once this is done,
          the pool may no longer be accessible by software that does not support
          the features. See zpool-features(5) for details.
    scan: scrub in progress since Sun May 10 00:24:01 2020
          15,1T scanned at 0B/s, 15,1T issued at 0B/s, 15,1T total
          1,44M repaired, 100,01% done, no estimated completion time
  config:

          NAME        STATE     READ WRITE CKSUM
          datastore   ONLINE       0     0     0
            raidz2-0  ONLINE       0     0     0
              sdb     ONLINE       0     0     0
              sdc     ONLINE       0     0     0
              sdd     ONLINE       0     0     0
              sde     ONLINE       0     0     0
              sdf     ONLINE       0     0     0
              sdg     ONLINE       0     0     0

  errors: No known data errors

  
  Running zdb it always stops ad 2,23T and then aborts.
  # zdb -e -bcsvL datastore
  Traversing all blocks to verify checksums ...
  2.23T completed ( 149MB/s) estimated time remaining: 25hr 06min 25sec        
free(): invalid pointer
  Abort (SIGABRT)

  
  #zpool import datastore
  VERIFY3(c < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT) failed (36028797018963967 
< 32768)
  PANIC at zio.c:293:zio_buf_alloc()

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