hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 12239 at fs/hfsplus/bnode.c:579 hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:579
Modules linked in:
CPU: 1 UID: 0 PID: 12239 Comm: syz.1.651 Not tainted 6.16.0-rc7-syzkaller-00120-g5f33ebd2018c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:579
Code: a1 8b 89 ee e8 80 4f 93 fe e9 cf fc ff ff e8 06 dd 2b ff 4c 89 ef e8 3e cc d4 08 48 c7 c7 a0 9b a1 8b 89 ee e8 60 4f 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:ffffc900051f7100 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff8880799ec000 RCX: e044e801d92c3900
RDX: ffffc90010a15000 RSI: 00000000000046ea RDI: 00000000000046eb
RBP: 0000000000000000 R08: ffffc900051f6e27 R09: 1ffff92000a3edc4
R10: dffffc0000000000 R11: fffff52000a3edc5 R12: 0000000000000000
R13: ffff8880799ec0e0 R14: ffff888028b23a00 R15: dffffc0000000000
FS:  00007f8342e6c6c0(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8342e4af98 CR3: 0000000033b7c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x5af/0x640 fs/hfsplus/btree.c:415
 hfs_bnode_split+0xcc/0xef0 fs/hfsplus/brec.c:245
 hfsplus_brec_insert+0x38f/0xcc0 fs/hfsplus/brec.c:100
 hfsplus_create_cat+0x3b6/0x1000 fs/hfsplus/catalog.c:292
 hfsplus_mknod+0x16a/0x290 fs/hfsplus/dir.c:494
 lookup_open fs/namei.c:3717 [inline]
 open_last_lookups fs/namei.c:3816 [inline]
 path_openat+0x14f4/0x3830 fs/namei.c:4052
 do_filp_open+0x1fa/0x410 fs/namei.c:4082
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8341f8e9a9
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:00007f8342e6c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f83421b5fa0 RCX: 00007f8341f8e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007f8342010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f83421b5fa0 R15: 00007ffd807c98c8
 </TASK>