** Changed in: ubuntu-z-systems
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1841447

Title:
  Periodic Msg "BUG: non-zero pgtables_bytes on freeing mm: -16384"

Status in Ubuntu on IBM z Systems:
  Confirmed
Status in linux package in Ubuntu:
  New

Bug description:
  A message "BUG: non-zero pgtables_bytes on freeing mm: -16384" 
  occurs frequently during IPL of Ubuntu 18.04.1 and 18.04.2 and also
  periodically appear very often on the console device after the IPL
  has finished, which is very annoying.

  See the output of the dmesg and journalctl -b commands are attached.

  Both versions 18.04.1 and 18.04.2 use the same kernel:

  root@m83lp37:~# uname -a
  Linux m83lp37 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:03 UTC 2019 
s390x s390x s390x GNU/Linux
  root@m83lp37:~# 

  The problem appears on LPAR as well as on a z/VM guest.

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