hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: fs/hfsplus/bnode.c:671 at hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:671, CPU#0: syz.2.30/6136
Modules linked in:
CPU: 0 UID: 0 PID: 6136 Comm: syz.2.30 Not tainted 6.16.0-next-20250808-syzkaller #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:671
Code: a1 8b 89 ee e8 90 6d 8f fe e9 cf fc ff ff e8 96 81 27 ff 4c 89 ef e8 4e 4c e5 08 48 c7 c7 c0 b9 a1 8b 89 ee e8 70 6d 8f 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:ffffc9000b5a6fa0 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff88807cf4a000 RCX: 9f1f815784978200
RDX: ffffc9000beda000 RSI: 0000000000005077 RDI: 0000000000005078
RBP: 0000000000000000 R08: ffffc9000b5a6cc7 R09: 1ffff920016b4d98
R10: dffffc0000000000 R11: fffff520016b4d99 R12: 0000000000000000
R13: ffff88807cf4a0e0 R14: ffff88801fa85700 R15: dffffc0000000000
FS:  00007f3ae83ba6c0(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6cef9b2000 CR3: 0000000028948000 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_fill_super+0x12f5/0x1b50 fs/hfsplus/super.c:559
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
 do_mount fs/namespace.c:4133 [inline]
 __do_sys_mount fs/namespace.c:4344 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4321
 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: 0033:0x7f3ae759038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3ae83b9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3ae83b9ef0 RCX: 00007f3ae759038a
RDX: 0000200000000100 RSI: 0000200000000480 RDI: 00007f3ae83b9eb0
RBP: 0000200000000100 R08: 00007f3ae83b9ef0 R09: 0000000002000010
R10: 0000000002000010 R11: 0000000000000246 R12: 0000200000000480
R13: 00007f3ae83b9eb0 R14: 00000000000006f1 R15: 0000200000000000
 </TASK>