============================================
WARNING: possible recursive locking detected
6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Not tainted
--------------------------------------------
syz.1.1338/10186 is trying to acquire lock:
ffff8880528720b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33

but task is already holding lock:
ffff8880528720b0 (&tree->tree_lock#2/1){+.+.}-{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#2/1);
  lock(&tree->tree_lock#2/1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

6 locks held by syz.1.1338/10186:
 #0: ffff888026e6e8c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xeb/0x180 fs/file.c:1191
 #1: ffff888026c2a420 (sb_writers#23){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643
 #2: ffff88804d985728 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
 #2: ffff88804d985728 (&sb->s_type->i_mutex_key#27){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4133
 #3: ffff88804d985578 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397
 #4: ffff8880528720b0 (&tree->tree_lock#2/1){+.+.}-{3:3}, at: hfs_find_init+0x183/0x220 fs/hfs/bfind.c:33
 #5: ffff88804d981af8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397

stack backtrace:
CPU: 1 PID: 10186 Comm: syz.1.1338 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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_cache_extent fs/hfs/extent.c:174 [inline]
 hfs_ext_read_extent+0x809/0x9e0 fs/hfs/extent.c:202
 hfs_extend_file+0x4e4/0xb10 fs/hfs/extent.c:401
 hfs_get_block+0x17f/0x830 fs/hfs/extent.c:353
 __block_write_begin_int+0x4fb/0x16e0 fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0xb1/0x4a0 fs/buffer.c:2236
 cont_write_begin+0x53d/0x740 fs/buffer.c:2590
 hfs_write_begin+0x87/0x150 fs/hfs/inode.c:53
 generic_perform_write+0x272/0x620 mm/filemap.c:4015
 __generic_file_write_iter+0x1fd/0x240 mm/filemap.c:4110
 generic_file_write_iter+0xe7/0x350 mm/filemap.c:4136
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f997bf75ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f997ce1a048 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f997c103fa0 RCX: 00007f997bf75ae9
RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000005
RBP: 00007f997bff6746 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f997c103fa0 R15: 00007ffd8103d2c8
 </TASK>