loop5: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.5.209/7398 is trying to acquire lock:
ffff8880658a58b8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:262

but task is already holding lock:
ffff8880658a51f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 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

6 locks held by syz.5.209/7398:
 #0: ffff8880271100d0 (&type->s_umount_key#51/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline]
 #0: ffff8880271100d0 (&type->s_umount_key#51/1){+.+.}-{4:4}, at: sget_fc+0x938/0x1910 fs/super.c:766
 #1: ffff888062b82978 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_fill_super+0x11ad/0x1ab0 fs/hfsplus/super.c:621
 #2: ffff8880643d20a0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
 #3: ffff8880282c80a0 (&tree->tree_lock/2){+.+.}-{4:4}, at: hfsplus_find_init+0x168/0x2d0 fs/hfsplus/bfind.c:28
 #4: ffff8880658a51f8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21c/0x1df0 fs/hfsplus/extents.c:455
 #5: ffff888062b828e8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xa9/0xd30 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 UID: 0 PID: 7398 Comm: syz.5.209 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x24df/0x2ce0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/rtmutex_api.c:559 [inline]
 mutex_lock_nested+0x5a/0x1d0 kernel/locking/rtmutex_api.c:578
 hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:262
 block_read_full_folio+0x29f/0x810 fs/buffer.c:2398
 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2510
 do_read_cache_folio+0x2bf/0x560 mm/filemap.c:4140
 do_read_cache_page mm/filemap.c:4206 [inline]
 read_cache_page+0x5d/0x170 mm/filemap.c:4215
 read_mapping_page include/linux/pagemap.h:1009 [inline]
 hfsplus_block_allocate+0xf7/0xd30 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0xb77/0x1df0 fs/hfsplus/extents.c:466
 hfsplus_bmap_reserve+0x170/0x590 fs/hfsplus/btree.c:512
 hfsplus_create_attr+0x1ce/0x3a0 fs/hfsplus/attributes.c:288
 __hfsplus_setxattr+0x706/0x2800 fs/hfsplus/xattr.c:453
 hfsplus_initxattrs+0x1ae/0x280 fs/hfsplus/xattr_security.c:59
 security_inode_init_security+0x29b/0x3e0 security/security.c:1370
 hfsplus_fill_super+0x1328/0x1ab0 fs/hfsplus/super.c:635
 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1640
 vfs_get_tree+0x92/0x2a0 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount+0x319/0xdc0 fs/namespace.c:3841
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81aec0f28a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81ace65e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f81ace65ee0 RCX: 00007f81aec0f28a
RDX: 0000200000000000 RSI: 00002000000000c0 RDI: 00007f81ace65ea0
RBP: 0000200000000000 R08: 00007f81ace65ee0 R09: 0000000000010000
R10: 0000000000010000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f81ace65ea0 R14: 00000000000006a0 R15: 00002000000002c0
 </TASK>
loop5: detected capacity change from 0 to 4096