Re: [syzbot] [nilfs?] [mm?] KASAN: slab-use-after-free Read in lru_add_fn

[Hillf Danton]

On Tue, 11 Jun 2024 11:10:20 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    83a7eefedc9b Linux 6.10-rc3
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17c645e2980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  83a7eefedc9b

--- x/mm/truncate.c
+++ y/mm/truncate.c
@@ -418,6 +418,9 @@ void truncate_inode_pages_range(struct a
 		truncate_folio_batch_exceptionals(mapping, &fbatch, indices);
 		folio_batch_release(&fbatch);
 	}
+
+	if (mapping_exiting(mapping))
+		lru_add_drain_all();
 }
 EXPORT_SYMBOL(truncate_inode_pages_range);
 
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