The patch titled
Subject: mm: fix vma_copy for !CONFIG_PER_VMA_LOCK
has been added to the -mm mm-unstable branch. Its filename is
mm-make-vma-cache-slab_typesafe_by_rcu-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-make-vma-cache-slab_typesafe_by_rcu-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: fix vma_copy for !CONFIG_PER_VMA_LOCK
Date: Mon, 9 Dec 2024 14:10:28 -0800
vma_copy() function for !CONFIG_PER_VMA_LOCK configuration copies all
fields using memcpy() as opposed to CONFIG_PER_VMA_LOCK version which
copies only required fields. anon_vma_chain field should not be copied
and new vma should instead initialize it to an empty list. Fix this by
initializing anon_vma_chain inside vma_copy() function. The version of
vma_copy() for CONFIG_PER_VMA_LOCK is fine since it does not change that
field and anon_vma_chain of any new vma is already initialized and empty.
Link: https://lkml.kernel.org/r/20241209221028.1644210-1-surenb@xxxxxxxxxx
Fixes: 85ad413389ae ("mm: make vma cache SLAB_TYPESAFE_BY_RCU")
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-lkp/202412082208.db1fb2c9-lkp@xxxxxxxxx
Reported-by: Klara Modin <klarasmodin@xxxxxxxxx>
Closes: https://lore.kernel.org/all/d0ae7609-aca4-4497-9188-bb09e96e7768@xxxxxxxxx/
Tested-by: Klara Modin <klarasmodin@xxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Hillf Danton <hdanton@xxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/fork.c | 1 +
1 file changed, 1 insertion(+)
--- a/kernel/fork.c~mm-make-vma-cache-slab_typesafe_by_rcu-fix
+++ a/kernel/fork.c
@@ -524,6 +524,7 @@ static void vma_copy(const struct vm_are
* will be reinitialized.
*/
data_race(memcpy(dest, src, sizeof(*dest)));
+ INIT_LIST_HEAD(&dest->anon_vma_chain);
}
#endif /* CONFIG_PER_VMA_LOCK */
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
alloc_tag-fix-module-allocation-tags-populated-area-calculation.patch
alloc_tag-fix-set_codetag_empty-when-config_mem_alloc_profiling_debug.patch
seqlock-add-raw_seqcount_try_begin.patch
mm-convert-mm_lock_seq-to-a-proper-seqcount.patch
mm-introduce-mmap_lock_speculate_try_beginretry.patch
mm-introduce-vma_start_read_locked_nested-helpers.patch
mm-move-per-vma-lock-into-vm_area_struct.patch
mm-mark-vma-as-detached-until-its-added-into-vma-tree.patch
mm-make-vma-cache-slab_typesafe_by_rcu.patch
mm-make-vma-cache-slab_typesafe_by_rcu-fix.patch
mm-slab-allow-freeptr_offset-to-be-used-with-ctor.patch
docs-mm-document-latest-changes-to-vm_lock.patch
