============================================
WARNING: possible recursive locking detected
6.16.0-rc7-syzkaller-g82af5ea7c611 #0 Not tainted
--------------------------------------------
syz.5.329/8672 is trying to acquire lock:
ffff0000c911e0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28

but task is already holding lock:
ffff0000c911e0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28

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.5.329/8672:
 #0: ffff0000c877c428 (sb_writers#26){.+.+}-{0:0}, at: do_ftruncate+0x374/0x458 fs/open.c:194
 #1: ffff0000dd6dbfb8 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:874 [inline]
 #1: ffff0000dd6dbfb8 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63
 #2: ffff0000dd6dbdc8 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:577
 #3: ffff0000c911e0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
 #4: ffff0000dd6dd8c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:458

stack backtrace:
CPU: 0 UID: 0 PID: 8672 Comm: syz.5.329 Not tainted 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:3044
 check_deadlock kernel/locking/lockdep.c:3096 [inline]
 validate_chain kernel/locking/lockdep.c:3898 [inline]
 __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5240
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871
 __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:602
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
 hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
 hfsplus_file_extend+0x350/0x1388 fs/hfsplus/extents.c:462
 hfsplus_bmap_reserve+0xe8/0x494 fs/hfsplus/btree.c:358
 __hfsplus_ext_write_extent+0x1e4/0x4cc fs/hfsplus/extents.c:104
 __hfsplus_ext_cache_extent+0x84/0xa88 fs/hfsplus/extents.c:186
 hfsplus_file_truncate+0x370/0x970 fs/hfsplus/extents.c:600
 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:264
 notify_change+0x9a4/0xc50 fs/attr.c:552
 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+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596