hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:520, CPU#0: kworker/u8:7/1114
Modules linked in:
CPU: 0 UID: 0 PID: 1114 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: writeback wb_workfn (flush-7:1)
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:520
Code: e8 8b 89 ee e8 c7 82 73 fe e9 d6 fc ff ff e8 ed 34 12 ff 4c 89 ef e8 f5 3f 03 09 48 c7 c7 60 af e8 8b 89 ee e8 a7 82 73 fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c dd fb ff ff
RSP: 0018:ffffc90005766c68 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88802a11e000 RCX: b4215dd34a071a00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880b8624713 R09: 1ffff110170c48e2
R10: dffffc0000000000 R11: ffffed10170c48e3 R12: 0000000000000000
R13: ffff88802a11e0d8 R14: ffff8880330d7300 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125220000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd318443eb8 CR3: 0000000057c42000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bd/0x650 fs/hfs/btree.c:326
 hfs_btree_inc_height+0xf9/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x7eb/0xc80 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a3/0x470 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x17e/0x210 fs/hfs/extent.c:144
 hfs_write_inode+0x116/0x990 fs/hfs/inode.c:461
 write_inode fs/fs-writeback.c:1607 [inline]
 __writeback_single_inode+0x6ac/0xf90 fs/fs-writeback.c:1850
 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2079
 wb_writeback+0x41c/0xad0 fs/fs-writeback.c:2264
 wb_do_writeback fs/fs-writeback.c:2432 [inline]
 wb_workfn+0x431/0x10f0 fs/fs-writeback.c:2477
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>