============================================
WARNING: possible recursive locking detected
6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 Not tainted
--------------------------------------------
syz.3.348/8485 is trying to acquire lock:
ffff0000f8d45f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000d609df88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:577

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.3.348/8485:
 #0: ffff0000d76be420 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:556
 #1: ffff0000d609e178 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #1: ffff0000d609e178 (&sb->s_type->i_mutex_key#27){+.+.}-{4:4}, at: do_truncate+0x164/0x1f0 fs/open.c:63
 #2: ffff0000d609df88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:577
 #3: ffff0000cd25c0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xb8/0x3f8 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 1 UID: 0 PID: 8485 Comm: syz.3.348 Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (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:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain kernel/locking/lockdep.c:3896 [inline]
 __lock_acquire+0x28f4/0x3058 kernel/locking/lockdep.c:5235
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866
 __mutex_lock_common+0x1d0/0x2190 kernel/locking/mutex.c:601
 __mutex_lock kernel/locking/mutex.c:746 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798
 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:2401
 do_read_cache_folio+0x368/0x5c0 mm/filemap.c:3885
 do_read_cache_page mm/filemap.c:3951 [inline]
 read_cache_page+0x6c/0x160 mm/filemap.c:3960
 read_mapping_page include/linux/pagemap.h:989 [inline]
 hfsplus_block_free+0x108/0x3f8 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x14c/0x8d8 fs/hfsplus/extents.c:363
 hfsplus_file_truncate+0x5e0/0x970 fs/hfsplus/extents.c:592
 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:264
 notify_change+0x9a4/0xc50 fs/attr.c:552
 do_truncate+0x178/0x1f0 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x25a0/0x2c40 fs/namei.c:4039
 do_filp_open+0x18c/0x36c fs/namei.c:4066
 do_sys_openat2+0x11c/0x1b4 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_openat fs/open.c:1460 [inline]
 __se_sys_openat fs/open.c:1455 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1455
 __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+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
hfsplus: unable to mark blocks free: error -5
hfsplus: can't free extent