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/u8:10/3387
Modules linked in:
CPU: 0 UID: 0 PID: 3387 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:hfs_bnode_create+0x45a/0x4e0 fs/hfs/bnode.c:478
Code: 4a 8c 89 ee e8 a7 7e 60 fe e9 d6 fc ff ff e8 9d f0 01 ff 4c 89 ef e8 85 fa 46 09 48 c7 c7 20 b1 4a 8c 89 ee e8 87 7e 60 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: 0000:ffffc9000e876ce8 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88803732c000 RCX: bc92f27f81a54b00
RDX: 0000000000000000 RSI: 8000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc9000e876a67 R09: 1ffff92001d0ed4c
R10: dffffc0000000000 R11: fffff52001d0ed4d R12: 0000000000000000
R13: ffff88803732c0d8 R14: ffff888037be1900 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881233f0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc203565080 CR3: 000000007ceae000 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+0x34b/0x620 fs/hfs/extent.c:124
 hfs_ext_write_extent+0x17d/0x210 fs/hfs/extent.c:150
 hfs_write_inode+0x117/0xa00 fs/hfs/inode.c:475
 write_inode fs/fs-writeback.c:1629 [inline]
 __writeback_single_inode+0x69d/0x1220 fs/fs-writeback.c:1872
 writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2120
 wb_writeback+0x41c/0xad0 fs/fs-writeback.c:2305
 wb_do_writeback fs/fs-writeback.c:2473 [inline]
 wb_workfn+0x431/0x10f0 fs/fs-writeback.c:2518
 process_one_work kernel/workqueue.c:3505 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669
 kthread+0x38b/0x480 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>