Public bug reported:
[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.
** Affects: ubuntu-kernel-tests
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: Confirmed
** Tags: 4.15 bionic s390x sru-20210719 ubuntu-boot
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
** Tags added: 4.15 bionic s390x sru-20210719
** Tags added: ubuntu-boot
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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
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