loop0: detected capacity change from 0 to 64
============================================
WARNING: possible recursive locking detected
6.8.0-rc2-syzkaller-g1bbb19b6eb1b #0 Not tainted
--------------------------------------------
syz-executor.0/5475 is trying to acquire lock:
ffff8880788fc0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33

but task is already holding lock:
ffff8880788fc0b0 (&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

6 locks held by syz-executor.0/5475:
 #0: ffff88802aaf14c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe7/0x170 fs/file.c:1191
 #1: ffff8880788fa420 (sb_writers#14){.+.+}-{0:0}, at: ksys_write+0x12f/0x250 fs/read_write.c:643
 #2: ffff88807e7e1628 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #2: ffff88807e7e1628 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: generic_file_write_iter+0x92/0x350 mm/filemap.c:4048
 #3: ffff88807e7e1478 (&HFS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397
 #4: ffff8880788fc0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfs_find_init+0x17f/0x220 fs/hfs/bfind.c:33
 #5: ffff88807e7e00f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{3:3}, at: hfs_extend_file+0xa2/0xb10 fs/hfs/extent.c:397

stack backtrace:
CPU: 0 PID: 5475 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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:3856 [inline]
 __lock_acquire+0x210a/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:752
 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_cache_extent fs/hfs/extent.c:174 [inline]
 hfs_ext_read_extent+0x805/0x9d0 fs/hfs/extent.c:202
 hfs_extend_file+0x4e0/0xb10 fs/hfs/extent.c:401
 hfs_get_block+0x17f/0x820 fs/hfs/extent.c:353
 __block_write_begin_int+0x4fb/0x16e0 fs/buffer.c:2103
 __block_write_begin fs/buffer.c:2152 [inline]
 block_write_begin+0xb1/0x490 fs/buffer.c:2211
 cont_write_begin+0x530/0x730 fs/buffer.c:2565
 hfs_write_begin+0x87/0x140 fs/hfs/inode.c:53
 generic_perform_write+0x278/0x600 mm/filemap.c:3930
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4025
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4051
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6d5/0x1100 fs/read_write.c:590
 ksys_write+0x12f/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fb51dc7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb51e91a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb51ddabf80 RCX: 00007fb51dc7cda9
RDX: 000000000208e24b RSI: 0000000020000180 RDI: 0000000000000004
RBP: 00007fb51dcc947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb51ddabf80 R15: 00007ffc66fb9008
 </TASK>