From: Naoya Horiguchi naoya.horiguchi@nec.com
mainline inclusion from mainline-v6.0 commit 2b7aa91ba0e86b8643f5d3c83874c80599c731d7 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAR7B3
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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NULL pointer dereference is triggered when calling thp split via debugfs on the system with offlined memory blocks. With debug option enabled, the following kernel messages are printed out:
page:00000000467f4890 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121c000 flags: 0x17fffc00000000(node=0|zone=2|lastcpupid=0x1ffff) raw: 0017fffc00000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: unmovable page page:000000007d7ab72e is uninitialized and poisoned page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p)) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1248! invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 16 PID: 20964 Comm: bash Tainted: G I 6.0.0-rc3-foll-numa+ #41 ... RIP: 0010:split_huge_pages_write+0xcf4/0xe30
This shows that page_to_nid() in page_zone() is unexpectedly called for an offlined memmap.
Use pfn_to_online_page() to get struct page in PFN walker.
Link: https://lkml.kernel.org/r/20220908041150.3430269-1-naoya.horiguchi@linux.dev Fixes: f1dd2cd13c4b ("mm, memory_hotplug: do not associate hotadded memory to zones until online") [visible after d0dc12e86b319] Signed-off-by: Naoya Horiguchi naoya.horiguchi@nec.com Co-developed-by: David Hildenbrand david@redhat.com Signed-off-by: David Hildenbrand david@redhat.com Reviewed-by: Yang Shi shy828301@gmail.com Acked-by: Michal Hocko mhocko@suse.com Reviewed-by: Miaohe Lin linmiaohe@huawei.com Reviewed-by: Oscar Salvador osalvador@suse.de Acked-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com Cc: Matthew Wilcox willy@infradead.org Cc: Muchun Song songmuchun@bytedance.com Cc: stable@vger.kernel.org [5.10+] Signed-off-by: Andrew Morton akpm@linux-foundation.org Conflicts: mm/huge_memory.c [ Context conflicts. ] Signed-off-by: Liu Shixin liushixin2@huawei.com --- mm/huge_memory.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index eb293d17a1049..e41be42456673 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2882,11 +2882,8 @@ static int split_huge_pages_set(void *data, u64 val) for_each_populated_zone(zone) { max_zone_pfn = zone_end_pfn(zone); for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) { - if (!pfn_valid(pfn)) - continue; - - page = pfn_to_page(pfn); - if (!get_page_unless_zero(page)) + page = pfn_to_online_page(pfn); + if (!page || !get_page_unless_zero(page)) continue;
if (zone != page_zone(page))