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#1: syz.6.673/11570
Modules linked in:
CPU: 1 UID: 0 PID: 11570 Comm: syz.6.673 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: 22 8b 89 ee e8 80 5a 8e fe e9 cf fc ff ff e8 06 51 28 ff 4c 89 ef e8 0e 0e 56 08 48 c7 c7 00 14 22 8b 89 ee e8 60 5a 8e 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:ffffc900056f7380 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff8880364a8000 RCX: 0979e741bf441300
RDX: ffffc9000dc51000 RSI: 000000000000c7e2 RDI: 000000000000c7e3
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000adee21 R12: 0000000000000000
R13: ffff8880364a80d0 R14: ffff8880320e7400 R15: dffffc0000000000
FS:  00007ff117c366c0(0000) GS:ffff8881269d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feac6b41200 CR3: 000000005d398000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x747/0xb00 fs/hfsplus/btree.c:421
 hfs_bnode_split+0xd4/0x1090 fs/hfsplus/brec.c:245
 hfsplus_brec_insert+0x3bc/0xd70 fs/hfsplus/brec.c:100
 hfsplus_create_cat+0xa7d/0x11c0 fs/hfsplus/catalog.c:308
 hfsplus_link+0x413/0x6e0 fs/hfsplus/dir.c:342
 vfs_link+0x518/0x6e0 fs/namei.c:5655
 do_linkat+0x266/0x5b0 fs/namei.c:5725
 __do_sys_link fs/namei.c:5759 [inline]
 __se_sys_link fs/namei.c:5757 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:5757
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff1199dacb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff117c36028 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007ff119c55fa0 RCX: 00007ff1199dacb9
RDX: 0000000000000000 RSI: 0000200000000bc0 RDI: 0000200000001240
RBP: 00007ff119a48bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff119c56038 R14: 00007ff119c55fa0 R15: 00007ffcd09144e8
 </TASK>