============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.1.67/7149 is trying to acquire lock:
ffff0000c2799548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000c6128108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 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

4 locks held by syz.1.67/7149:
 #0: ffff0000d90ae428 (sb_writers#21){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3108 [inline]
 #0: ffff0000d90ae428 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x24c/0xa3c fs/read_write.c:682
 #1: ffff0000c61282f8 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
 #1: ffff0000c61282f8 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: generic_file_write_iter+0xdc/0x47c mm/filemap.c:4315
 #2: ffff0000c6128108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:455
 #3: ffff0000cf29e0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 UID: 0 PID: 7149 Comm: syz.1.67 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (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:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x2940/0x30a4 kernel/locking/lockdep.c:5237
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598
 __mutex_lock kernel/locking/mutex.c:760 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812
 hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260
 block_read_full_folio+0x2ec/0x824 fs/buffer.c:2420
 hfsplus_read_folio+0x28/0x38 fs/hfsplus/inode.c:28
 filemap_read_folio+0xec/0x2f8 mm/filemap.c:2413
 do_read_cache_folio+0x364/0x5bc mm/filemap.c:3957
 do_read_cache_page mm/filemap.c:4023 [inline]
 read_cache_page+0x6c/0x160 mm/filemap.c:4032
 read_mapping_page include/linux/pagemap.h:985 [inline]
 hfsplus_block_allocate+0xdc/0x70c fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0x770/0x1388 fs/hfsplus/extents.c:466
 hfsplus_get_block+0x314/0x1154 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2145
 block_write_begin fs/buffer.c:2256 [inline]
 cont_write_begin+0x62c/0x968 fs/buffer.c:2594
 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:48
 cont_expand_zero fs/buffer.c:2522 [inline]
 cont_write_begin+0x26c/0x968 fs/buffer.c:2584
 hfsplus_write_begin+0x7c/0xc4 fs/hfsplus/inode.c:48
 generic_perform_write+0x244/0x7bc mm/filemap.c:4175
 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4292
 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x540/0xa3c fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __arm64_sys_pwrite64+0x170/0x208 fs/read_write.c:798
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
netlink: 24 bytes leftover after parsing attributes in process `syz.1.67'.