hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#1: kworker/u10:1/36
Modules linked in:
CPU: 1 UID: 0 PID: 36 Comm: kworker/u10:1 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-7:0)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: e7 8b 89 ee e8 60 5d 78 fe e9 cf fc ff ff e8 f6 4b 16 ff 4c 89 ef e8 8e a2 01 09 48 c7 c7 c0 dd e7 8b 89 ee e8 40 5d 78 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:ffffc90000ac6c80 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888113a0a000 RCX: 4afaa162ebc65700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88823c6247d3 R09: 1ffff110478c48fa
R10: dffffc0000000000 R11: ffffed10478c48fb R12: 0000000000000000
R13: ffff888113a0a0e0 R14: ffff888166729100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a945f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f23b0617dac CR3: 0000000168e3a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5c1/0x650
 hfs_btree_inc_height+0x100/0xad0
 hfs_brec_insert+0x7ef/0xc90
 __hfs_ext_write_extent+0x2a1/0x470
 hfs_ext_write_extent+0x17e/0x210
 hfs_write_inode+0x117/0x960
 __writeback_single_inode+0x75a/0x11a0
 writeback_sb_inodes+0x992/0x1a20
 wb_writeback+0x456/0xb70
 wb_workfn+0x414/0xf50
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
