Re: [syzbot] [mm?] BUG: Bad page map (8)

[Hillf Danton]

On Thu, 18 Jul 2024 15:51:26 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    4d145e3f830b Merge tag 'i2c-for-6.10-rc8' of git://git.ker..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1366ab85980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  4d145e3f830b

--- x/mm/truncate.c
+++ y/mm/truncate.c
@@ -192,6 +192,7 @@ int truncate_inode_folio(struct address_
 		return -EIO;
 
 	truncate_cleanup_folio(folio);
+	BUG_ON(folio_mapped(folio));
 	filemap_remove_folio(folio);
 	return 0;
 }
--