============================================
WARNING: possible recursive locking detected
6.9.0-rc3-syzkaller-00344-g8f2c057754b2 #0 Not tainted
--------------------------------------------
kworker/u32:4/81 is trying to acquire lock:
ffff88801d3ee0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33

but task is already holding lock:
ffff88801d3ee0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 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

5 locks held by kworker/u32:4/81:
 #0: ffff888018695948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x1296/0x1ac0 kernel/workqueue.c:3229
 #1: ffffc90000fb7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1ac0 kernel/workqueue.c:3230
 #2: ffff88802bf100e0 (&type->s_umount_key#60){.+.+}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:561
 #3: ffff88801d3ee0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33
 #4: ffff88802c7800f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397

stack backtrace:
CPU: 3 PID: 81 Comm: kworker/u32:4 Not tainted 6.9.0-rc3-syzkaller-00344-g8f2c057754b2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
 hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33
 hfs_ext_read_extent+0x19c/0x9e0 fs/hfs/extent.c:200
 hfs_extend_file+0x4e4/0xb10 fs/hfs/extent.c:401
 hfs_bmap_reserve+0x29c/0x380 fs/hfs/btree.c:234
 __hfs_ext_write_extent+0x3cf/0x520 fs/hfs/extent.c:121
 hfs_ext_write_extent+0x1b7/0x200 fs/hfs/extent.c:144
 hfs_write_inode+0xc4/0x9f0 fs/hfs/inode.c:427
 write_inode fs/fs-writeback.c:1498 [inline]
 __writeback_single_inode+0xb36/0xf90 fs/fs-writeback.c:1715
 writeback_sb_inodes+0x5a6/0x10d0 fs/fs-writeback.c:1941
 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2012
 wb_writeback+0x7db/0xb30 fs/fs-writeback.c:2119
 wb_check_background_flush fs/fs-writeback.c:2189 [inline]
 wb_do_writeback fs/fs-writeback.c:2277 [inline]
 wb_workfn+0x8c4/0xf40 fs/fs-writeback.c:2304
 process_one_work+0x9a9/0x1ac0 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>