============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.4.73/6985 is trying to acquire lock:
ffff0000cc2540b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x168/0x28c fs/hfs/bfind.c:-1

but task is already holding lock:
ffff0000cc2540b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x168/0x28c fs/hfs/bfind.c:-1

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 syz.4.73/6985:
 #0: ffff0000ce8b8420 (sb_writers#20){.+.+}-{0:0}, at: do_ftruncate+0x374/0x458 fs/open.c:194
 #1: ffff0000ed741620 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:985 [inline]
 #1: ffff0000ed741620 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63
 #2: ffff0000ed741478 (&HFS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xd4/0x10e4 fs/hfs/extent.c:397
 #3: ffff0000cc2540b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfs_find_init+0x168/0x28c fs/hfs/bfind.c:-1
 #4: ffff0000ed7400f8 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_extend_file+0xd4/0x10e4 fs/hfs/extent.c:397

stack backtrace:
CPU: 0 UID: 0 PID: 6985 Comm: syz.4.73 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_deadlock_bug+0x2e8/0x2f0 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5237
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598
 __mutex_lock kernel/locking/mutex.c:760 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
 hfs_find_init+0x168/0x28c fs/hfs/bfind.c:-1
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_extend_file+0x22c/0x10e4 fs/hfs/extent.c:401
 hfs_bmap_reserve+0xd4/0x3e0 fs/hfs/btree.c:269
 __hfs_ext_write_extent+0x19c/0x488 fs/hfs/extent.c:121
 __hfs_ext_cache_extent+0x84/0x750 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x258/0x10e4 fs/hfs/extent.c:401
 hfs_get_block+0x2e8/0x9cc fs/hfs/extent.c:353
 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2145
 block_write_begin fs/buffer.c:2256 [inline]
 cont_write_begin+0x62c/0x968 fs/buffer.c:2594
 hfs_write_begin+0x7c/0xc4 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2522 [inline]
 cont_write_begin+0x26c/0x968 fs/buffer.c:2584
 hfs_write_begin+0x7c/0xc4 fs/hfs/inode.c:52
 hfs_file_truncate+0x164/0x8e0 fs/hfs/extent.c:495
 hfs_inode_setattr+0x398/0x554 fs/hfs/inode.c:665
 notify_change+0xa0c/0xcb8 fs/attr.c:546
 do_truncate+0x198/0x210 fs/open.c:68
 do_ftruncate+0x3bc/0x458 fs/open.c:195
 do_sys_ftruncate fs/open.c:210 [inline]
 __do_sys_ftruncate fs/open.c:215 [inline]
 __se_sys_ftruncate fs/open.c:213 [inline]
 __arm64_sys_ftruncate+0x90/0xe8 fs/open.c:213
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596