Re: [syzbot] [kernel] WARNING: locking bug in try_to_wake_up
From: Hillf Danton
Date: Tue Oct 01 2024 - 04:32:37 EST
On Mon, 30 Sep 2024 16:39:29 -0700
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 9852d85ec9d4 Linux 6.12-rc1
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13ad839f980000
#syz test
--- x/fs/btrfs/disk-io.c
+++ y/fs/btrfs/disk-io.c
@@ -4316,7 +4316,6 @@ void __cold close_ctree(struct btrfs_fs_
btrfs_error_commit_super(fs_info);
kthread_stop(fs_info->transaction_kthread);
- kthread_stop(fs_info->cleaner_kthread);
ASSERT(list_empty(&fs_info->delayed_iputs));
set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
@@ -4349,6 +4348,7 @@ void __cold close_ctree(struct btrfs_fs_
*/
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
btrfs_stop_all_workers(fs_info);
+ kthread_stop(fs_info->cleaner_kthread);
/* We shouldn't have any transaction open at this point */
warn_about_uncommitted_trans(fs_info);
--