loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.14.0-rc4-syzkaller-00090-gdd83757f6e68 #0 Not tainted
--------------------------------------------
syz-executor250/5823 is trying to acquire lock:
ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28

but task is already holding lock:
ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 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-executor250/5823:
 #0: ffff888079dfc420 (sb_writers#9){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline]
 #0: ffff888079dfc420 (sb_writers#9){.+.+}-{0:0}, at: vfs_write+0x225/0xd10 fs/read_write.c:675
 #1: ffff88802dc724b8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline]
 #1: ffff88802dc724b8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: generic_file_write_iter+0xe0/0x5e0 mm/filemap.c:4313
 #2: ffff88802dc722c8 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
 #3: ffff888079dfe0b0 (&tree->tree_lock/1){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28
 #4: ffff88807b018108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458

stack backtrace:
CPU: 0 UID: 0 PID: 5823 Comm: syz-executor250 Not tainted 6.14.0-rc4-syzkaller-00090-gdd83757f6e68 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3039
 check_deadlock kernel/locking/lockdep.c:3091 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3893
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
 hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28
 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
 hfsplus_file_extend+0x454/0x1b70 fs/hfsplus/extents.c:462
 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358
 __hfsplus_ext_write_extent+0x2a4/0x5c0 fs/hfsplus/extents.c:104
 __hfsplus_ext_cache_extent+0x84/0xe10 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x48c/0x1b70 fs/hfsplus/extents.c:462
 hfsplus_get_block+0x406/0x14f0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x692/0x19a0 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2226 [inline]
 cont_write_begin+0x77f/0xb40 fs/buffer.c:2577
 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
 generic_perform_write+0x346/0x990 mm/filemap.c:4189
 generic_file_write_iter+0x10c/0x5e0 mm/filemap.c:4316
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xacf/0xd10 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62bb7dbad9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd6bf48498 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f62bb7dbad9
RDX: 00000000175d9003 RSI: 0000400000000200 RDI: 0000000000000004
RBP: 00007f62bb84f5f0 R08: 000055555f17a4c0 R09: 000055555f17a4c0
R10: 0000000000000702 R11: 0000000000000246 R12: 00007ffd6bf484c0
R13: 00007ffd6bf486e8 R14: 431bde82d7b634db R15: 00007f62bb82403b
 </TASK>