============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.3.220/8228 is trying to acquire lock:
ffff0000d5fc22c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000d5fc3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:574

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.3.220/8228:
 #0: ffff0000c4530428 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557
 #1: ffff0000d5fc3238 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: inode_lock_killable include/linux/fs.h:875 [inline]
 #1: ffff0000d5fc3238 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: do_truncate+0x164/0x210 fs/open.c:63
 #2: ffff0000d5fc3048 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x20c/0x970 fs/hfsplus/extents.c:574
 #3: ffff0000dafaf8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xb8/0x3f8 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 1 UID: 0 PID: 8228 Comm: syz.3.220 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_free+0x108/0x3f8 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x10c/0x880 fs/hfsplus/extents.c:360
 hfsplus_file_truncate+0x5e0/0x970 fs/hfsplus/extents.c:589
 hfsplus_setattr+0x184/0x24c fs/hfsplus/inode.c:266
 notify_change+0x9a4/0xc50 fs/attr.c:552
 do_truncate+0x198/0x210 fs/open.c:68
 vfs_truncate+0x398/0x444 fs/open.c:118
 do_sys_truncate+0xe4/0x1a8 fs/open.c:141
 __do_sys_truncate fs/open.c:153 [inline]
 __se_sys_truncate fs/open.c:151 [inline]
 __arm64_sys_truncate+0x5c/0x74 fs/open.c:151
 __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
hfsplus: unable to mark blocks free: error -5
hfsplus: can't free extent