============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.0/5338 is trying to acquire lock:
ffff8880131c20a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29

but task is already holding lock:
ffff8880131c20a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29

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

locks held by syz.0.0/5338: 4, last CPU#0:
 #0: ffff8880524ae1d8 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff8880524ae1d8 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: hfsplus_file_fsync+0x12d/0x7f0 fs/hfsplus/inode.c:380
 #1: ffff8880524ae040 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_ext_write_extent+0x90/0x230 fs/hfsplus/extents.c:153
 #2: ffff8880131c20a8 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29
 #3: ffff8880524b4740 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 fs/hfsplus/extents.c:457

stack backtrace:
CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3057
 check_deadlock kernel/locking/lockdep.c:3109 [inline]
 validate_chain kernel/locking/lockdep.c:3911 [inline]
 __lock_acquire+0x261c/0x2e50 kernel/locking/lockdep.c:5254
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821
 hfsplus_find_init+0x179/0x2e0 fs/hfsplus/bfind.c:29
 hfsplus_ext_read_extent fs/hfsplus/extents.c:220 [inline]
 hfsplus_file_extend+0x4b8/0x1df0 fs/hfsplus/extents.c:461
 hfsplus_bmap_reserve+0x170/0x590 fs/hfsplus/btree.c:512
 __hfsplus_ext_write_extent+0x295/0x690 fs/hfsplus/extents.c:104
 hfsplus_ext_write_extent_locked fs/hfsplus/extents.c:143 [inline]
 hfsplus_ext_write_extent+0x19a/0x230 fs/hfsplus/extents.c:154
 hfsplus_write_inode+0x2c/0x700 fs/hfsplus/super.c:175
 write_inode fs/fs-writeback.c:1608 [inline]
 __writeback_single_inode+0x69d/0x1220 fs/fs-writeback.c:1851
 writeback_single_inode+0x544/0xf70 fs/fs-writeback.c:1926
 sync_inode_metadata+0x122/0x1d0 fs/fs-writeback.c:3100
 hfsplus_file_fsync+0x13a/0x7f0 fs/hfsplus/inode.c:385
 generic_write_sync include/linux/fs.h:2686 [inline]
 generic_file_write_iter+0x280/0x330 mm/filemap.c:4521
 aio_write+0x5d0/0x870 fs/aio.c:1687
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x798/0x13d0 fs/aio.c:2106
 __do_sys_io_submit fs/aio.c:2165 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2135
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22d599e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f22d67bbfe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f22d5c26720 RCX: 00007f22d599e159
RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f22d6883000
RBP: 00007f22d5a35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f22d5c267b8 R14: 00007f22d5c26720 R15: 00007ffda5ae2278
 </TASK>