The patch titled
Subject: mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Josef Bacik <josef@xxxxxxxxxxxxxx>
Subject: mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2
Date: Wed, 13 Jul 2022 10:13:37 -0400
Link: https://lkml.kernel.org/r/e90c8f0dbae836632b669c2afc434006a00d4a67.1657721478.git.josef@xxxxxxxxxxxxxx
Fixes: f9ce0be71d1f ("mm: Cleanup faultaround and finish_fault() codepaths")
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/mm/memory.c~mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2
+++ a/mm/memory.c
@@ -4369,7 +4369,10 @@ vm_fault_t finish_fault(struct vm_fault
return VM_FAULT_OOM;
}
- /* See comment in handle_pte_fault() */
+ /*
+ * See comment in handle_pte_fault() for how this scenario happens, we
+ * need to return NOPAGE so that we drop this page.
+ */
if (pmd_devmap_trans_unstable(vmf->pmd))
return VM_FAULT_NOPAGE;
_
Patches currently in -mm which might be from josef@xxxxxxxxxxxxxx are
mm-fix-page-leak-with-multiple-threads-mapping-the-same-page.patch
mm-fix-page-leak-with-multiple-threads-mapping-the-same-page-v2.patch
