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-rw-r--r--mm/filemap.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 5be7887957..321349e2c9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -4150,7 +4150,23 @@ static void filemap_cachestat(struct address_space *mapping,
/* shmem file - in swap cache */
swp_entry_t swp = radix_to_swp_entry(folio);
+ /* swapin error results in poisoned entry */
+ if (non_swap_entry(swp))
+ goto resched;
+
+ /*
+ * Getting a swap entry from the shmem
+ * inode means we beat
+ * shmem_unuse(). rcu_read_lock()
+ * ensures swapoff waits for us before
+ * freeing the swapper space. However,
+ * we can race with swapping and
+ * invalidation, so there might not be
+ * a shadow in the swapcache (yet).
+ */
shadow = get_shadow_from_swap_cache(swp);
+ if (!shadow)
+ goto resched;
}
#endif
if (workingset_test_recent(shadow, true, &workingset))