The quilt patch titled
Subject: mm/page_table_check: fix crash on ZONE_DEVICE
has been removed from the -mm tree. Its filename was
mm-page_table_check-fix-crash-on-zone_device.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/page_table_check: fix crash on ZONE_DEVICE
Date: Wed, 5 Jun 2024 17:21:46 -0400
Not all pages may apply to pgtable check. One example is ZONE_DEVICE
pages: they map PFNs directly, and they don't allocate page_ext at all
even if there's struct page around. One may reference
devm_memremap_pages().
When both ZONE_DEVICE and page-table-check enabled, then try to map some
dax memories, one can trigger kernel bug constantly now when the kernel
was trying to inject some pfn maps on the dax device:
kernel BUG at mm/page_table_check.c:55!
While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page
fault resolutions, skip all the checks if page_ext doesn't even exist in
pgtable checker, which applies to ZONE_DEVICE but maybe more.
Link: https://lkml.kernel.org/r/20240605212146.994486-1-peterx@xxxxxxxxxx
Fixes: df4e817b7108 ("mm: page table check")
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reviewed-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_table_check.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/mm/page_table_check.c~mm-page_table_check-fix-crash-on-zone_device
+++ a/mm/page_table_check.c
@@ -73,6 +73,9 @@ static void page_table_check_clear(unsig
page = pfn_to_page(pfn);
page_ext = page_ext_get(page);
+ if (!page_ext)
+ return;
+
BUG_ON(PageSlab(page));
anon = PageAnon(page);
@@ -110,6 +113,9 @@ static void page_table_check_set(unsigne
page = pfn_to_page(pfn);
page_ext = page_ext_get(page);
+ if (!page_ext)
+ return;
+
BUG_ON(PageSlab(page));
anon = PageAnon(page);
@@ -140,7 +146,10 @@ void __page_table_check_zero(struct page
BUG_ON(PageSlab(page));
page_ext = page_ext_get(page);
- BUG_ON(!page_ext);
+
+ if (!page_ext)
+ return;
+
for (i = 0; i < (1ul << order); i++) {
struct page_table_check *ptc = get_page_table_check(page_ext);
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-drop-leftover-comment-references-to-pxx_huge.patch
