============================================
WARNING: possible recursive locking detected
6.6.0-rc3-syzkaller-00096-g71e58659bfc0 #0 Not tainted
--------------------------------------------
kworker/u4:0/10 is trying to acquire lock:
ffff88802587e0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33

but task is already holding lock:
ffff88802587e0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&tree->tree_lock/1);
  lock(&tree->tree_lock/1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by kworker/u4:0/10:
 #0: ffff888143665538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc9000030fd80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff88802587e0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33
 #3: ffff8880251b94b8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397

stack backtrace:
CPU: 1 PID: 10 Comm: kworker/u4:0 Not tainted 6.6.0-rc3-syzkaller-00096-g71e58659bfc0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3855 [inline]
 __lock_acquire+0x2971/0x5de0 kernel/locking/lockdep.c:5136
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747
 hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33
 hfs_ext_read_extent+0x19c/0x9d0 fs/hfs/extent.c:200
 hfs_extend_file+0x4e0/0xb10 fs/hfs/extent.c:401
 hfs_bmap_reserve+0x29c/0x370 fs/hfs/btree.c:234
 __hfs_ext_write_extent+0x3cb/0x520 fs/hfs/extent.c:121
 hfs_ext_write_extent+0x1b3/0x1f0 fs/hfs/extent.c:144
 hfs_write_inode+0xc4/0x9f0 fs/hfs/inode.c:431
 write_inode fs/fs-writeback.c:1456 [inline]
 __writeback_single_inode+0xa81/0xe70 fs/fs-writeback.c:1673
 writeback_sb_inodes+0x599/0x1070 fs/fs-writeback.c:1899
 wb_writeback+0x2a5/0xa90 fs/fs-writeback.c:2075
 wb_do_writeback fs/fs-writeback.c:2222 [inline]
 wb_workfn+0x29c/0xfd0 fs/fs-writeback.c:2262
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>