============================================
WARNING: possible recursive locking detected
5.15.182-syzkaller #0 Not tainted
--------------------------------------------
syz.5.668/7326 is trying to acquire lock:
ffff0000d1fc5f88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x2cc/0x11c8 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000d1fc0108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x12f4 fs/hfsplus/extents.c:458

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.5.668/7326:
 #0: ffff0000cddac460 (sb_writers#31){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000d1fc0300 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff0000d1fc0300 (&sb->s_type->i_mutex_key#36){+.+.}-{3:3}, at: do_truncate+0x164/0x1f0 fs/open.c:63
 #2: ffff0000d1fc0108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x180/0x12f4 fs/hfsplus/extents.c:458
 #3: ffff0000cfdcd0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x88/0x7bc fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 PID: 7326 Comm: syz.5.668 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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+0x18a4/0x651c kernel/locking/lockdep.c:-1
 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743
 hfsplus_get_block+0x2cc/0x11c8 fs/hfsplus/extents.c:260
 block_read_full_page+0x298/0xc40 fs/buffer.c:2290
 hfsplus_readpage+0x28/0x38 fs/hfsplus/inode.c:28
 do_read_cache_page+0x5f4/0x8f8 mm/filemap.c:-1
 read_cache_page+0x68/0x88 mm/filemap.c:3574
 read_mapping_page include/linux/pagemap.h:515 [inline]
 hfsplus_block_allocate+0xd8/0x7bc fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0x738/0x12f4 fs/hfsplus/extents.c:469
 hfsplus_get_block+0x324/0x11c8 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x3e4/0x1588 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x4e4/0x6dc fs/buffer.c:2471
 hfsplus_write_begin+0xa8/0xf8 fs/hfsplus/inode.c:53
 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608
 cont_expand_zero fs/buffer.c:2398 [inline]
 cont_write_begin+0x220/0x6dc fs/buffer.c:2461
 hfsplus_write_begin+0xa8/0xf8 fs/hfsplus/inode.c:53
 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608
 generic_cont_expand_simple+0xf0/0x1a0 fs/buffer.c:2362
 hfsplus_setattr+0x148/0x258 fs/hfsplus/inode.c:261
 notify_change+0xa08/0xcd8 fs/attr.c:505
 do_truncate+0x178/0x1f0 fs/open.c:65
 vfs_truncate+0x23c/0x2b0 fs/open.c:111
 do_sys_truncate+0xe8/0x1b0 fs/open.c:134
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584