You have been subscribed to a public bug:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-189321 severity-critical
targetmilestone-inin20041
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[UBUNUT 20.04] s390: dbginfo.sh triggers kernel panic, reading from
/sys/kernel/mm/page_idle/bitmap
https://bugs.launchpad.net/bugs/1904884
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