loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/6734 is trying to acquire lock:
ffff0000c5b51548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x2bc/0x1154 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff0000c5b507c8 (&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

7 locks held by syz.0.17/6734:
 #0: ffff0000da09e428 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557
 #1: ffff0000c5b51df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
 #1: ffff0000c5b51df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3272 [inline]
 #1: ffff0000c5b51df8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: do_renameat2+0x364/0x8c8 fs/namei.c:5224
 #2: ffff0000c5b53238 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:870 [inline]
 #2: ffff0000c5b53238 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: lock_two_nondirectories+0xc4/0x150 fs/inode.c:1232
 #3: ffff0000c5b538f8 (&sb->s_type->i_mutex_key#20/4){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
 #3: ffff0000c5b538f8 (&sb->s_type->i_mutex_key#20/4){+.+.}-{4:4}, at: lock_two_nondirectories+0xf0/0x150 fs/inode.c:1234
 #4: ffff0000da09a0b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x144/0x1bc fs/hfsplus/bfind.c:28
 #5: ffff0000c5b507c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1b8/0x1388 fs/hfsplus/extents.c:455
 #6: ffff0000d7b840f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x88/0x70c fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 UID: 0 PID: 6734 Comm: syz.0.17 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_bmap_reserve+0xe8/0x494 fs/hfsplus/btree.c:358
 hfsplus_rename_cat+0x17c/0xd48 fs/hfsplus/catalog.c:456
 hfsplus_rename+0x120/0x1b0 fs/hfsplus/dir.c:552
 vfs_rename+0x934/0xce0 fs/namei.c:5129
 do_renameat2+0x614/0x8c8 fs/namei.c:5278
 __do_sys_renameat2 fs/namei.c:5312 [inline]
 __se_sys_renameat2 fs/namei.c:5309 [inline]
 __arm64_sys_renameat2+0xd8/0xf4 fs/namei.c:5309
 __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