============================================
WARNING: possible recursive locking detected
6.16.0-rc4-syzkaller-g7482bb149b9f #0 Not tainted
--------------------------------------------
syz.2.65/6998 is trying to acquire lock:
ffff0000c66e8e88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000c66ea988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:458

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

5 locks held by syz.2.65/6998:
 #0: ffff0000d84ebb38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x1fc/0x2a0 fs/file.c:1217
 #1: ffff0000c6592428 (sb_writers#18){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3096 [inline]
 #1: ffff0000c6592428 (sb_writers#18){.+.+}-{0:0}, at: vfs_write+0x244/0x97c fs/read_write.c:682
 #2: ffff0000c66eab78 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
 #2: ffff0000c66eab78 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: generic_file_write_iter+0xd4/0x470 mm/filemap.c:4252
 #3: ffff0000c66ea988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:458
 #4: ffff0000db8680f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 UID: 0 PID: 6998 Comm: syz.2.65 Not tainted 6.16.0-rc4-syzkaller-g7482bb149b9f #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:501 (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_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260
 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2427
 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28
 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2412
 do_read_cache_folio+0x364/0x5bc mm/filemap.c:3894
 do_read_cache_page mm/filemap.c:3960 [inline]
 read_cache_page+0x6c/0x160 mm/filemap.c:3969
 read_mapping_page include/linux/pagemap.h:966 [inline]
 hfsplus_block_allocate+0xdc/0x70c fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0x770/0x1388 fs/hfsplus/extents.c:469
 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245
 get_more_blocks fs/direct-io.c:648 [inline]
 do_direct_IO fs/direct-io.c:936 [inline]
 __blockdev_direct_IO+0x10bc/0x2818 fs/direct-io.c:1243
 blockdev_direct_IO include/linux/fs.h:3477 [inline]
 hfsplus_direct_IO+0xf0/0x1d0 fs/hfsplus/inode.c:129
 generic_file_direct_write+0x1a8/0x350 mm/filemap.c:4046
 __generic_file_write_iter+0x10c/0x204 mm/filemap.c:4215
 generic_file_write_iter+0x104/0x470 mm/filemap.c:4255
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x62c/0x97c fs/read_write.c:686
 ksys_write+0x120/0x210 fs/read_write.c:738
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:746
 __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:600