When I added page_mapped() resilience in __delete_from_page_cache() for
the mapping_exiting() case, I missed that mapping_set_exiting() is done
in truncate_inode_pages_final(), which is not actually called for shmem.
(Today, it is folio_mapped() resilience in filemap_unaccount_folio().)
So the fixup to avoid a memory leak in this case never worked on shmem:
add a mapping_set_exiting() in shmem_evict_inode() at last. But this
is hardly a candidate for stable, since it's only useful if "Bad page".
Fixes: 06b241f32c71 ("mm: __delete_from_page_cache show Bad page if mapped")
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
mm/shmem.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1129,6 +1129,7 @@ static void shmem_evict_inode(struct inode *inode)
if (shmem_mapping(inode->i_mapping)) {
shmem_unacct_size(info->flags, inode->i_size);
inode->i_size = 0;
+ mapping_set_exiting(inode->i_mapping);
shmem_truncate_range(inode, 0, (loff_t)-1);
if (!list_empty(&info->shrinklist)) {
spin_lock(&sbinfo->shrinklist_lock);
