============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.3.18/4514 is trying to acquire lock:
ffff0000def79548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000def7b048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x1324 fs/hfsplus/extents.c:455

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.3.18/4514:
 #0: ffff0000d9f1ad68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x114/0x16c fs/file.c:1038
 #1: ffff0000d3d5a460 (sb_writers#14){.+.+}-{0:0}, at: vfs_write+0x23c/0x7c4 fs/read_write.c:580
 #2: ffff0000def7b240 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #2: ffff0000def7b240 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: generic_file_write_iter+0x84/0x2b0 mm/filemap.c:4003
 #3: ffff0000def7b048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x1324 fs/hfsplus/extents.c:455
 #4: ffff0000db30b0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x88/0x7d8 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 PID: 4514 Comm: syz.3.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 __lock_acquire+0x18b4/0x6544 kernel/locking/lockdep.c:-1
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 __mutex_lock_common+0x190/0x1f38 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260
 block_read_full_folio+0x2e4/0x97c fs/buffer.c:2271
 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28
 filemap_read_folio+0x130/0x37c mm/filemap.c:2490
 do_read_cache_folio+0x24c/0x544 mm/filemap.c:3627
 do_read_cache_page mm/filemap.c:3669 [inline]
 read_cache_page+0x6c/0x184 mm/filemap.c:3678
 read_mapping_page include/linux/pagemap.h:791 [inline]
 hfsplus_block_allocate+0xdc/0x7d8 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0x73c/0x1324 fs/hfsplus/extents.c:466
 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245
 get_more_blocks fs/direct-io.c:665 [inline]
 do_direct_IO fs/direct-io.c:953 [inline]
 __blockdev_direct_IO+0x112c/0x318c fs/direct-io.c:1266
 blockdev_direct_IO include/linux/fs.h:3342 [inline]
 hfsplus_direct_IO+0xf4/0x1dc fs/hfsplus/inode.c:135
 generic_file_direct_write+0x31c/0x620 mm/filemap.c:3770
 __generic_file_write_iter+0x1bc/0x37c mm/filemap.c:3930
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ac/0x7c4 fs/read_write.c:584
 ksys_write+0x120/0x210 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585