hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 49 at fs/hfs/bnode.c:428 hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:428
Modules linked in:
CPU: 1 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted 6.15.0-syzkaller-09113-g8477ab143069 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: writeback wb_workfn (flush-7:4)
RIP: 0010:hfs_bnode_create+0x461/0x4f0 fs/hfs/bnode.c:428
Code: a1 8b 89 ee e8 d0 92 90 fe e9 cf fc ff ff e8 16 44 29 ff 4c 89 ef e8 5e 00 c8 08 48 c7 c7 a0 a4 a1 8b 89 ee e8 b0 92 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:ffffc90000ba6c20 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88805af6c000 RCX: 29b3ae60dc8ac400
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90000ba6907 R09: 1ffff92000174d20
R10: dffffc0000000000 R11: fffff52000174d21 R12: 0000000000000000
R13: ffff88805af6c0e0 R14: ffff88802cec2e00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d99000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f96d090de9c CR3: 000000007ba12000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x743/0xbd0 fs/hfs/brec.c:148
 __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_sb_inodes+0x6b5/0x1000 fs/fs-writeback.c:1976
 wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x409/0xef0 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>