ZFS and the CDDL licence means that we will always have this tainting.
It is expected.

** Changed in: linux (Ubuntu)
       Status: Incomplete => In Progress

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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  zfs modules in Focal kernel taint kernel

Status in linux package in Ubuntu:
  In Progress

Bug description:
  the ZFS modules in the shipping focal kernel do not contain the intree
  flag, and because of that I believe they are the cause of kernel
  tainting discovered during 20.04 certification testing.

  The output from a recent certification test run for 20.04:

  Kernel taint value is 4097
  Taint bit value: 0 (proprietary module was loaded)
  Taint bit value: 12 (externally-built ('out-of-tree') module was loaded)

  Looking into modinfo for everything loaded at the time, it appears
  that the ZFS modules are loaded (even though we did not configure any
  ZFS filesystems), and that seems to be the root cause of the test
  failure.  To test this, I checked /proc/sys/kernel/tainted and
  verified it was tainted. I then blacklisted all the ZFS related
  modules and rebooted, and then checked /proc/sys/kernel/tainted again
  and the kernel no longer shows as being tainted.

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