hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 40 at fs/hfs/bnode.c:520 hfs_bnode_create+0x461/0x4f0
Modules linked in:
CPU: 1 UID: 0 PID: 40 Comm: kworker/u10:2 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-7:5)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: a1 8b 89 ee e8 40 d8 8d fe e9 cf fc ff ff e8 a6 e6 25 ff 4c 89 ef e8 9e 95 e2 08 48 c7 c7 a0 ce a1 8b 89 ee e8 20 d8 8d 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:ffffc900006eec20 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8881097d4000 RCX: 1b3cc156290f1f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc900006ee947 R09: 1ffff920000ddd28
R10: dffffc0000000000 R11: fffff520000ddd29 R12: 0000000000000000
R13: ffff8881097d40e0 R14: ffff8880201a5700 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe283be538 CR3: 0000000024230000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640
 hfs_btree_inc_height+0xf6/0xac0
 hfs_brec_insert+0x743/0xbd0
 __hfs_ext_write_extent+0x2a1/0x470
 hfs_ext_write_extent+0x161/0x1e0
 hfs_write_inode+0x91/0x7d0
 __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+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
