On Wed, 13 May 2026 21:04:32 +0800, Muchun Song [off-list ref] wrote:

Gigantic bootmem HugeTLB pages are currently initialized from hugetlb_init(),
but page_alloc_init_late() runs earlier and walks pageblocks to determine
zone contiguity.

If a bootmem HugeTLB region is marked noinit, set_zone_contiguous() can
observe still-uninitialized struct pages through __pageblock_pfn_to_page().
This may not trigger an immediate failure, but it can make
set_zone_contiguous() compute the wrong zone contiguity state. If extra
poisoned-page checks are added in this path, such as PF_POISONED_CHECK()
in page_zone_id(), it can also trigger an early boot panic.

[...]

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

-- 
Sincerely yours,
Mike.