============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.6.4580/26955 is trying to acquire lock:
ffff888053b85208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff888032495208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x215/0x1d70 fs/hfsplus/extents.c:453

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&HFSPLUS_I(inode)->extents_lock);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

6 locks held by syz.6.4580/26955:
 #0: ffff888022bda420 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #1: ffff888053b83fb8 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline]
 #1: ffff888053b83fb8 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3756 [inline]
 #1: ffff888053b83fb8 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: __start_renaming+0x148/0x410 fs/namei.c:3852
 #2: ffff88802b9653f8 (&sb->s_type->i_mutex_key#39/4){+.+.}-{4:4}, at: vfs_rename+0x68a/0xeb0 fs/namei.c:5989
 #3: ffff8880780860b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
 #4: ffff888032495208 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x215/0x1d70 fs/hfsplus/extents.c:453
 #5: ffff88802961f0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa7/0xce0 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 UID: 0 PID: 26955 Comm: syz.6.4580 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/mutex.c:614 [inline]
 __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776
 hfsplus_get_block+0x39e/0x1670 fs/hfsplus/extents.c:260
 block_read_full_folio+0x29f/0x830 fs/buffer.c:2418
 filemap_read_folio+0x137/0x3b0 mm/filemap.c:2496
 do_read_cache_folio+0x358/0x590 mm/filemap.c:4096
 do_read_cache_page mm/filemap.c:4162 [inline]
 read_cache_page+0x5d/0x170 mm/filemap.c:4171
 read_mapping_page include/linux/pagemap.h:1022 [inline]
 hfsplus_block_allocate+0xf3/0xce0 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0xb2d/0x1d70 fs/hfsplus/extents.c:464
 hfsplus_bmap_reserve+0x125/0x510 fs/hfsplus/btree.c:358
 hfsplus_rename_cat+0x22a/0x1000 fs/hfsplus/catalog.c:456
 hfsplus_rename+0x135/0x1f0 fs/hfsplus/dir.c:552
 vfs_rename+0xa96/0xeb0 fs/namei.c:6026
 filename_renameat2+0x539/0x9c0 fs/namei.c:6144
 __do_sys_renameat2 fs/namei.c:6173 [inline]
 __se_sys_renameat2+0x5a/0x2c0 fs/namei.c:6168
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2fbf59aeb9
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:00007f2fc0446028 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f2fbf815fa0 RCX: 00007f2fbf59aeb9
RDX: ffffffffffffff9c RSI: 00002000000008c0 RDI: ffffffffffffff9c
RBP: 00007f2fbf608c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000900 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fbf816038 R14: 00007f2fbf815fa0 R15: 00007fffbbe607d8
 </TASK>