The log_check WARNINGs with the 4.4 kernels is being addressed by bug
1965160 with commit 036e9ef8becd ("dmaengine: Replace WARN_TAINT_ONCE()
with pr_warn_once()").

This commit has been applied upstream for v4.13-rc1, so from bionic+ we
should have only the kernel tainted failure. However, that commit keeps
the TAINT_FIRMWARE_WORKAROUND taint flag and this is still true for
mainline, so probably this bug can't be fixed as this is a hardware
issue.

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https://bugs.launchpad.net/bugs/1912316

Title:
  log_check / kernel_tainted test from ubuntu_boot failed on Intel Cloud
  node grumman (failed with flag 2048)

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