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This bug was fixed in the package mdadm - 4.1-5ubuntu2

---------------
mdadm (4.1-5ubuntu2) groovy; urgency=medium

  * d/rules: Install misc/mdcheck (LP: #1852747)
    - The absence of mdcheck utility is preventing
      mdcheck_continue.service & mdcheck_start.service
      to execute the command when the service start via
      ExecStart. (Closes: #960132)

 -- Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>  Wed, 23 Sep 2020
14:08:32 -0400

** Changed in: mdadm (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  mdcheck_start.service trying to start unexisting file

Status in mdadm package in Ubuntu:
  Fix Released
Status in mdadm source package in Bionic:
  New
Status in mdadm source package in Focal:
  In Progress
Status in mdadm package in Debian:
  New

Bug description:
  ## DRAFT ##

  [Impact]

  The mdadm package is missing the mdcheck script. This has two
  consequences:

  In the immediate term, that means that we get failed systemd units on
  all of our physical machines (because they have mirrored disks) as we
  upgrade them to 20.04. This raises alarms in our monitoring system as
  we monitor systemd unit failures.

  In the longer-term, this means that the arrays are not being checked.
  If a drive develops a bad sector, this would normally be caught by the
  checking and a good copy would be rewritten from the other side of the
  mirror. Without the checking, that will not happen. If the other drive
  (the one with the good version of the sector) dies, then that sector's
  data is lost permanently. The consequences of that depend on what that
  sector was storing, but it's not good, obviously.

  [Test Case]

  * systemctl start mdcheck_start.service

  * journalctl -u mdcheck_start
  -- Logs begin at Wed 2020-09-23 18:33:35 UTC, end at Wed 2020-09-23 18:40:27 UTC. --
  Sep 23 18:40:27 mdadmgroovy systemd[1]: Starting MD array scrubbing...
  Sep 23 18:40:27 mdadmgroovy systemd[1515]: mdcheck_start.service: Failed to execute command: No such file or directory
  Sep 23 18:40:27 mdadmgroovy systemd[1515]: mdcheck_start.service: Failed at step EXEC spawning /usr/share/mdadm/mdcheck: No such file or directory
  Sep 23 18:40:27 mdadmgroovy systemd[1]: mdcheck_start.service: Main process exited, code=exited, status=203/EXEC
  Sep 23 18:40:27 mdadmgroovy systemd[1]: mdcheck_start.service: Failed with result 'exit-code'.
  Sep 23 18:40:27 mdadmgroovy systemd[1]: Failed to start MD array scrubbing.

  * ls -altr /usr/share/mdadm/mdcheck
  ls: cannot access '/usr/share/mdadm/mdcheck': No such file or directory

  * dpkg -l mdadm
  ii  mdadm          4.1-5ubuntu1 amd64        tool to administer Linux MD arrays (software RAID)

  * dpkg -L mdadm | grep -i mdcheck
  /lib/systemd/system/mdcheck_continue.service
  /lib/systemd/system/mdcheck_continue.timer
  /lib/systemd/system/mdcheck_start.service
  /lib/systemd/system/mdcheck_start.timer

  [Regression Potential]

  * 'misc/mdcheck' will be introduced in Ubuntu for the first time, and
  is pretty young in the Debian mdadm story too (introduced in Sept 12
  2020).

  Not known fix since debian introduced it 2 weeks-ish ago has been
  added on top of it so far.

  $ git log --oneline --grep="mdcheck"
  5a3db0f Install misc/mdcheck; turn on hardening; enable dh_lintian. (Closes: #960132)
  f258a5e mdcheck: improve cleanup
  ea83549 mdcheck: add some logging.
  979b1fe mdcheck: be careful when sourcing the output of "mdadm --detail --export"
  36dab45 mdcheck: don't git error if not /dev/md?* devices exist.
  868ab80 mdcheck: don't pass the '+' to "date".
  df881f7 mdcheck: new script to help with regular checks of md arrays.

  And no presence of new opened bug(s) related to mdcheck introduction.

  At code inspection, 'mdcheck' script seems to be harmless (at least at
  first glance), of course, real case scenario testing within raid types
  situations will be needed to conclude during the verification testing
  phase, and if possible, running the script in debug mode (set -xv)
  might be a good idea to see the script workflow in action.

  [Other Info]

  Debian bug:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960132

  salsa commit:
  https://salsa.debian.org/lechner/mdadm/-/commit/5a3db0f5429fc81e0f53cbf9aa473059b74fe057

  [Original Description]

  mdcheck_start.service trying to start unexisting file

  root@d:~# cat /lib/systemd/system/mdcheck_start.service  | grep Exec
  ExecStart=/usr/share/mdadm/mdcheck --duration $MDADM_CHECK_DURATION

  root@d:~# ls -la /usr/share/mdadm/mdcheck
  ls: cannot access '/usr/share/mdadm/mdcheck': No such file or directory

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: mdadm 4.1-2ubuntu3
  ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
  Uname: Linux 5.3.0-19-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  Date: Fri Nov 15 13:13:17 2019
  Lspci: Error: [Errno 2] No such file or directory: 'lspci': 'lspci'
  Lsusb: Error: [Errno 2] No such file or directory: 'lsusb': 'lsusb'
  MachineType: HP HP EliteBook x360 1030 G3
  ProcEnviron:
   LANG=C
   TERM=screen
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-19-generic root=/dev/mapper/system-root ro cryptdevice=UUID=95c107ea-73d0-4206-a31c-fb0ed6d7d6a9:cryptlvm mem_sleep_default=deep
  ProcMDstat:
   Personalities :
   unused devices: <none>
  SourcePackage: mdadm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/07/2019
  dmi.bios.vendor: HP
  dmi.bios.version: Q90 Ver. 01.08.01
  dmi.board.name: 8438
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 14.3F.00
  dmi.chassis.asset.tag: 5CD9296RDC
  dmi.chassis.type: 31
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrQ90Ver.01.08.01:bd08/07/2019:svnHP:pnHPEliteBookx3601030G3:pvr:rvnHP:rn8438:rvrKBCVersion14.3F.00:cvnHP:ct31:cvr:
  dmi.product.family: 103C_5336AN HP EliteBook x360
  dmi.product.name: HP EliteBook x360 1030 G3
  dmi.product.sku: 5SR46ES#ACB
  dmi.sys.vendor: HP
  etc.blkid.tab: Error: [Errno 2] No such file or directory: '/etc/blkid.tab'
  initrd.files: Error: [Errno 2] No such file or directory: '/boot/initrd.img-5.3.0-19-generic'

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