+ mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch added to mm-unstable branch

The patch titled
     Subject: mm/rmap: synchronize lock and unlock target in anon_vma_clone
has been added to the -mm mm-unstable branch.  Its filename is
     mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days

------------------------------------------------------
From: Eric Kim <[email protected]>
Subject: mm/rmap: synchronize lock and unlock target in anon_vma_clone
Date: Fri, 14 Aug 2026 15:30:51 +0900

Currently, in anon_vma_clone(), src vma's anon_vma is assigned to
active_anon_vma and is used when unlocking anon_vma after linking new
AVCs.  However, the anon_vma is locked using src->anon_vma, instead of
active_anon_vma, making the lock and unlock target inconsistent.

Use active_anon_vma for both locking and unlocking.

Link: https://lore.kernel.org/OS7PR01MB139142FE16EC63B892559D40496DA2@OS7PR01MB13914.jpnprd01.prod.outlook.com
Signed-off-by: Eric Kim <[email protected]>
Reviewed-by: Lorenzo Stoakes (ARM) <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Harry Yoo <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Lance Yang <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 mm/rmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/rmap.c~mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone
+++ a/mm/rmap.c
@@ -350,7 +350,7 @@ int anon_vma_clone(struct vm_area_struct
 	 * Now link the anon_vma's back to the newly inserted AVCs.
 	 * Note that all anon_vma's share the same root.
 	 */
-	anon_vma_lock_write(src->anon_vma);
+	anon_vma_lock_write(active_anon_vma);
 	list_for_each_entry_reverse(avc, &dst->anon_vma_chain, same_vma) {
 		struct anon_vma *anon_vma = avc->anon_vma;
 
_

Patches currently in -mm which might be from [email protected] are

mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch