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[Jürg Häfliger <1937068@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1937276 ***
    https://bugs.launchpad.net/bugs/1937276

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1937068

Title:
  "BUG: non-zero pgtables_bytes on freeing mm: 16384" errors during boot
  on bionic/linux s390x

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Confirmed

Bug description:
  [Impact]

  When booting bionic/linux 4.15.0-152.159 on a s390x machine there's a
  lot of the following error message on the kernel log:

  BUG: non-zero pgtables_bytes on freeing mm: 16384

  This error doesn't seem to happen on every boot.

  I could trace this happening as far back as 4.15.0-143.147, but this
  could be older as I don't have test results for older releases.

  This is similar to bug 1840046, which was supposedly fixed by an
  upstream stable patch around Sep/2019.

  [Test case]

  Boot bionic/linux on a s390x system.

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