Re: [syzbot] [btrfs?] kernel BUG in folio_unlock (2)

[Hillf Danton]

On Thu, 02 May 2024 09:24:30 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    9c6ecb3cb6e2 Add linux-next specific files for 20240502
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10efe5f8980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  9c6ecb3cb6e2

--- x/fs/btrfs/extent_io.c
+++ y/fs/btrfs/extent_io.c
@@ -1516,7 +1516,8 @@ done:
 					       PAGE_SIZE, !ret);
 		mapping_set_error(page->mapping, ret);
 	}
-	unlock_page(page);
+	if (PageLocked(page))
+		unlock_page(page);
 	ASSERT(ret <= 0);
 	return ret;
 }
--