This is a note to let you know that I've just added the patch titled
arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-mm-fix-incorrect-file_map_count-for-non-leaf-p.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f1e09150ed6fb7a83a7a0d1de6e392e3a4094d49
Author: Liu Shixin <liushixin2@xxxxxxxxxx>
Date: Thu Nov 17 15:56:01 2022 +0800
arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud
[ Upstream commit 5b47348fc0b18a78c96f8474cc90b7525ad1bbfe ]
The page table check trigger BUG_ON() unexpectedly when collapse hugepage:
------------[ cut here ]------------
kernel BUG at mm/page_table_check.c:82!
Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750
Hardware name: linux,dummy-virt (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : page_table_check_clear.isra.0+0x258/0x3f0
lr : page_table_check_clear.isra.0+0x240/0x3f0
[...]
Call trace:
page_table_check_clear.isra.0+0x258/0x3f0
__page_table_check_pmd_clear+0xbc/0x108
pmdp_collapse_flush+0xb0/0x160
collapse_huge_page+0xa08/0x1080
hpage_collapse_scan_pmd+0xf30/0x1590
khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8
khugepaged+0x338/0x518
kthread+0x278/0x2f8
ret_from_fork+0x10/0x20
[...]
Since pmd_user_accessible_page() doesn't check if a pmd is leaf, it
decrease file_map_count for a non-leaf pmd comes from collapse_huge_page().
and so trigger BUG_ON() unexpectedly.
Fix this problem by using pmd_leaf() insteal of pmd_present() in
pmd_user_accessible_page(). Moreover, use pud_leaf() for
pud_user_accessible_page() too.
Fixes: 42b2547137f5 ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Reported-by: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Signed-off-by: Liu Shixin <liushixin2@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Reviewed-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Acked-by: Will Deacon <will@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221117075602.2904324-2-liushixin2@xxxxxxxxxx
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index b5df82aa99e6..d78e69293d12 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -863,12 +863,12 @@ static inline bool pte_user_accessible_page(pte_t pte)
static inline bool pmd_user_accessible_page(pmd_t pmd)
{
- return pmd_present(pmd) && (pmd_user(pmd) || pmd_user_exec(pmd));
+ return pmd_leaf(pmd) && (pmd_user(pmd) || pmd_user_exec(pmd));
}
static inline bool pud_user_accessible_page(pud_t pud)
{
- return pud_present(pud) && pud_user(pud);
+ return pud_leaf(pud) && pud_user(pud);
}
#endif
