hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8503 at fs/hfs/bnode.c:428 hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:428
Modules linked in:
CPU: 1 UID: 0 PID: 8503 Comm: syz.4.373 Not tainted 6.16.0-rc5-syzkaller-00053-g8c2e52ebbe88 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:428
Code: a1 8b 89 ee e8 90 88 90 fe e9 cf fc ff ff e8 36 15 29 ff 4c 89 ef e8 1e 74 d3 08 48 c7 c7 20 c0 a1 8b 89 ee e8 70 88 90 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:ffffc9000badf000 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88823bfa6000 RCX: 2510b4eb33ddb000
RDX: ffffc9000cf34000 RSI: 0000000000025a83 RDI: 0000000000025a84
RBP: 0000000000000000 R08: ffffc9000baded27 R09: 1ffff9200175bda4
R10: dffffc0000000000 R11: fffff5200175bda5 R12: 0000000000000000
R13: ffff88823bfa60e0 R14: ffff888028fdef00 R15: dffffc0000000000
FS:  00007f319c56a6c0(0000) GS:ffff888125d4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f319c548f98 CR3: 0000000027ef8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640 fs/hfs/btree.c:291
 hfs_btree_inc_height+0xf6/0xac0 fs/hfs/brec.c:471
 hfs_brec_insert+0x12c/0xbd0 fs/hfs/brec.c:77
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x161/0x1e0 fs/hfs/extent.c:144
 hfs_write_inode+0x91/0x7d0 fs/hfs/inode.c:429
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x6f1/0xff0 fs/fs-writeback.c:1745
 writeback_single_inode+0x1f3/0x6a0 fs/fs-writeback.c:1801
 write_inode_now+0x158/0x1c0 fs/fs-writeback.c:2863
 hfs_file_fsync+0xa4/0x140 fs/hfs/inode.c:676
 generic_write_sync include/linux/fs.h:3031 [inline]
 generic_file_write_iter+0x311/0x540 mm/filemap.c:4259
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 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: 0033:0x7f319b78e929
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:00007f319c56a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f319b9b5fa0 RCX: 00007f319b78e929
RDX: 0000000000002400 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f319b810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f319b9b5fa0 R15: 00007ffe9ab2efe8
 </TASK>