hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:478 at hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478, CPU#0: kworker/u8:23/3381
Modules linked in:
CPU: 0 UID: 0 PID: 3381 Comm: kworker/u8:23 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: 89 8b 89 ee e8 37 e5 78 fe e9 d6 fc ff ff e8 6d 68 17 ff 4c 89 ef e8 45 78 a4 08 48 c7 c7 00 32 89 8b 89 ee e8 17 e5 78 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:ffffc9000f1fed08 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888062024000 RCX: 3753065729bc7100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52001e3fd51 R12: 0000000000000000
R13: ffff8880620240d0 R14: ffff88805cf46a00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125bf4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe306757008 CR3: 00000000377c8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 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+0x17d/0x210 fs/hfs/extent.c:144
 hfs_write_inode+0x117/0xa00 fs/hfs/inode.c:475
 write_inode fs/fs-writeback.c:1608 [inline]
 __writeback_single_inode+0x6a0/0x1230 fs/fs-writeback.c:1851
 writeback_sb_inodes+0x9db/0x1ab0 fs/fs-writeback.c:2099
 wb_writeback+0x41c/0xad0 fs/fs-writeback.c:2284
 wb_do_writeback fs/fs-writeback.c:2452 [inline]
 wb_workfn+0x437/0x10f0 fs/fs-writeback.c:2497
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551
 kthread+0x38b/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>