> On Fri, Oct 28, 2022 at 02:51:43PM +0000, Dominic Jones wrote:
> > Updating the machine's kernel from v5.19.x to v6.0.x causes the machine to not
> > successfully boot. The machine boots successfully (and exhibits stable operation)
> > with version v5.19.17 and multiple earlier releases in the 5.19 line. Multiple releases
> > from the 6.0 line (including 6.0.0, 6.0.3, and 6.0.5), with no other changes to the
> > software environment, do not boot. Instead, the machine hangs after loading services
> > but before presenting a display manager; the machine instead shows repetitive hard
> > drive activity at this point and then no apparent activity.
> >
> > ''uname'' output for the machine successfully running v5.19.17 is:
> >
> > Linux [MACHINE_NAME] 5.19.17 #1 SMP PREEMPT_DYNAMIC Mon Oct 24 13:32:29 2022 i686 Intel(R) Atom(TM) CPU N270 @ 1.60GHz GenuineIntel GNU/Linux
> >
> > The machine is an OCZ Neutrino netbook, running a custom OS build largely similar to
> > LFS development. The kernel update uses ''make olddefconfig''.
>
> Can you use 'git bisect' to find the offending change that causes this
> to happen?
Bisection is complete. Here's what it returned.
---
3a194f3f8ad01bce00bd7174aaba1563bcc827eb is the first bad commit
commit 3a194f3f8ad01bce00bd7174aaba1563bcc827eb
Author: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Date: Thu Jul 14 13:24:14 2022 +0900
mm/hugetlb: make pud_huge() and follow_huge_pud() aware of non-present pud entry
follow_pud_mask() does not support non-present pud entry now. As long as
I tested on x86_64 server, follow_pud_mask() still simply returns
no_page_table() for non-present_pud_entry() due to pud_bad(), so no severe
user-visible effect should happen. But generally we should call
follow_huge_pud() for non-present pud entry for 1GB hugetlb page.
Update pud_huge() and follow_huge_pud() to handle non-present pud entries.
The changes are similar to previous works for pud entries commit
e66f17ff7177 ("mm/hugetlb: take page table lock in follow_huge_pmd()") and
commit cbef8478bee5 ("mm/hugetlb: pmd_huge() returns true for non-present
hugepage").
Link: https://lkml.kernel.org/r/20220714042420.1847125-3-naoya.horiguchi@xxxxxxxxx
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: kernel test robot <lkp@xxxxxxxxx>
Cc: Liu Shixin <liushixin2@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
arch/x86/mm/hugetlbpage.c | 8 +++++++-
mm/hugetlb.c | 32 ++++++++++++++++++++++++++++++--
2 files changed, 37 insertions(+), 3 deletions(-)
---
Dominic
