** Attachment removed: "mm_page_idle.c_skip_offline_pages-backport.patch"
   
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1904884/+attachment/5436363/+files/mm_page_idle.c_skip_offline_pages-backport.patch

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https://bugs.launchpad.net/bugs/1904884

Title:
  s390: dbginfo.sh triggers kernel panic, reading from
  /sys/kernel/mm/page_idle/bitmap

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  New
Status in linux source package in Focal:
  New
Status in linux source package in Groovy:
  Fix Released
Status in linux source package in Hirsute:
  Fix Released

Bug description:
  System hangs on dbginfo.sh script execution.

  Solution:
  Commit 92fb1db26eef ("mm/page_idle.c: skip offline pages")

  Included upstream since kernel v5.8, so it is already included in
  Ubuntu 20.10, but not in 20.04 and earlier.

  
  Commit 92fb1db26eef ("mm/page_idle.c: skip offline pages") applies cleanly on 
ubuntu-focal, but not on ubuntu-bionic.

  Adjustment / backport for bionic should be trivial, but it is not IBM
  code and therefore the backport will be requested here by Canonical.

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