hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1091 at fs/hfs/bnode.c:520 hfs_bnode_create+0x461/0x4f0
Modules linked in:
CPU: 0 UID: 0 PID: 1091 Comm: kworker/u9:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:7)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: 82 8b 89 ee e8 c0 8b 89 fe e9 cf fc ff ff e8 06 fe 21 ff 4c 89 ef e8 7e 30 ab 08 48 c7 c7 20 35 82 8b 89 ee e8 a0 8b 89 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:ffffc90007dbec00 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88811b2b4000 RCX: 8b0986fffac71800
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90007dbe927 R09: 1ffff92000fb7d24
R10: dffffc0000000000 R11: fffff52000fb7d25 R12: 0000000000000000
R13: ffff88811b2b40e0 R14: ffff88816e7c8400 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd48a25b18 CR3: 0000000113d32000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640
 hfs_btree_inc_height+0xf6/0xac0
 hfs_brec_insert+0x7c2/0xc60
 __hfs_ext_write_extent+0x2a1/0x470
 hfs_ext_write_extent+0x161/0x1e0
 hfs_write_inode+0xc6/0x870
 __writeback_single_inode+0x6f1/0xff0
 writeback_sb_inodes+0x6c7/0x1010
 wb_writeback+0x43b/0xaf0
 wb_workfn+0x409/0xef0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
