hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: fs/hfsplus/bnode.c:631 at hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:631, CPU#0: syz.2.55/6321
Modules linked in:
CPU: 0 UID: 0 PID: 6321 Comm: syz.2.55 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:631
Code: 02 8b 89 ee e8 f0 50 91 fe e9 cf fc ff ff e8 86 70 2a ff 4c 89 ef e8 7e 1d 3f 08 48 c7 c7 00 10 02 8b 89 ee e8 d0 50 91 fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c d6 fb ff ff
RSP: 0018:ffffc9000c476da0 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff88803899c000 RCX: 38f8497039ac0800
RDX: ffffc9000d45a000 RSI: 00000000000019aa RDI: 00000000000019ab
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff5200188ed59 R12: 0000000000000000
R13: ffff88803899c0d0 R14: ffff888027a86600 R15: dffffc0000000000
FS:  00007f968014e6c0(0000) GS:ffff888126d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda0db1d000 CR3: 0000000027210000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x746/0xaf0 fs/hfsplus/btree.c:421
 hfs_btree_inc_height+0xf6/0xb60 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x12e/0xd70 fs/hfsplus/brec.c:75
 hfsplus_create_attr+0x30a/0x470 fs/hfsplus/attributes.c:252
 __hfsplus_setxattr+0x66f/0x23f0 fs/hfsplus/xattr.c:356
 hfsplus_initxattrs+0x1ae/0x280 fs/hfsplus/xattr_security.c:59
 security_inode_init_security+0x290/0x3d0 security/security.c:1344
 hfsplus_mknod+0x1a9/0x290 fs/hfsplus/dir.c:498
 lookup_open fs/namei.c:4440 [inline]
 open_last_lookups fs/namei.c:4540 [inline]
 path_openat+0x18d1/0x3df0 fs/namei.c:4784
 do_filp_open+0x1fa/0x410 fs/namei.c:4814
 do_sys_openat2+0x121/0x200 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]
 __x64_sys_openat+0x138/0x170 fs/open.c:1447
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9681eef749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f968014e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9682145fa0 RCX: 00007f9681eef749
RDX: 0000000000183042 RSI: 0000200000000740 RDI: ffffffffffffff9c
RBP: 00007f9681f73f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000016b R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9682146038 R14: 00007f9682145fa0 R15: 00007ffd8a776ff8
 </TASK>