============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.4.260/8753 is trying to acquire lock:
ffff0000ec2a9548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2d4/0x1268 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000ec2aa988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa58 fs/hfsplus/extents.c:573

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.4.260/8753:
 #0: ffff0000d4870420 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:499
 #1: ffff0000ec2aab78 (&sb->s_type->i_mutex_key#36){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1032 [inline]
 #1: ffff0000ec2aab78 (&sb->s_type->i_mutex_key#36){+.+.}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63
 #2: ffff0000ec2aa988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x21c/0xa58 fs/hfsplus/extents.c:573
 #3: ffff0000c8a200f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc0/0x4b8 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 1 UID: 0 PID: 8753 Comm: syz.4.260 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
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+0x140/0x2e0 kernel/locking/lockdep.c:5868
 __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:614
 __mutex_lock kernel/locking/mutex.c:776 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828
 hfsplus_get_block+0x2d4/0x1268 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:2496
 do_read_cache_folio+0x370/0x5c8 mm/filemap.c:4096
 do_read_cache_page mm/filemap.c:4162 [inline]
 read_cache_page+0x6c/0x160 mm/filemap.c:4171
 read_mapping_page include/linux/pagemap.h:1011 [inline]
 hfsplus_block_free+0x114/0x4b8 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x108/0x890 fs/hfsplus/extents.c:360
 hfsplus_file_truncate+0x5d0/0xa58 fs/hfsplus/extents.c:588
 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:286
 notify_change+0xa0c/0xcb8 fs/attr.c:546
 do_truncate+0x198/0x210 fs/open.c:68
 handle_truncate fs/namei.c:4235 [inline]
 do_open fs/namei.c:4632 [inline]
 path_openat+0x2a08/0x3114 fs/namei.c:4787
 do_filp_open+0x18c/0x36c fs/namei.c:4814
 do_sys_openat2+0x11c/0x1f0 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __arm64_sys_openat+0x120/0x158 fs/open.c:1447
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
hfsplus: unable to mark blocks free: error -5
hfsplus: can't free extent: start 134, count 1