hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: fs/hfsplus/bnode.c:630 at hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:630, CPU#1: syz.4.89/6575
Modules linked in:
CPU: 1 UID: 0 PID: 6575 Comm: syz.4.89 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:630
Code: 01 8b 89 ee e8 a0 98 93 fe e9 cf fc ff ff e8 a6 eb 2b ff 4c 89 ef e8 ce ab 2e 08 48 c7 c7 c0 db 01 8b 89 ee e8 80 98 93 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:ffffc90003d16da0 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff8880589fc000 RCX: 8607a488ac0a7600
RDX: ffffc9000df09000 RSI: 0000000000001a50 RDI: 0000000000001a51
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520007a2d59 R12: 0000000000000000
R13: ffff8880589fc0d0 R14: ffff888027555e00 R15: dffffc0000000000
FS:  00007f10755566c0(0000) GS:ffff888126e88000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f106d12c000 CR3: 000000004deee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x71a/0xad0 fs/hfsplus/btree.c:421
 hfs_btree_inc_height+0xf6/0xb60 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x12e/0xd30 fs/hfsplus/brec.c:75
 hfsplus_create_attr+0x30b/0x440 fs/hfsplus/attributes.c:252
 __hfsplus_setxattr+0x66f/0x2390 fs/hfsplus/xattr.c:358
 hfsplus_initxattrs+0x1ae/0x280 fs/hfsplus/xattr_security.c:59
 security_inode_init_security+0x2a0/0x3f0 security/security.c:1891
 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: 0033:0x7f10772ef749
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:00007f1075556038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1077545fa0 RCX: 00007f10772ef749
RDX: 0000000000143041 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f1077373f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1077546038 R14: 00007f1077545fa0 R15: 00007fff5652a688
 </TASK>