hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#1: kworker/u10:4/1094
Modules linked in:
CPU: 1 UID: 0 PID: 1094 Comm: kworker/u10:4 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-7:3)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: e8 8b 89 ee e8 c0 6e 79 fe e9 cf fc ff ff e8 66 c6 16 ff 4c 89 ef e8 0e 8f 06 09 48 c7 c7 20 1c e8 8b 89 ee e8 a0 6e 79 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:ffffc9000754ec60 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888116144000 RCX: 4ad5c32668565b00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff9032c9b7 R09: 1ffffffff2065936
R10: dffffc0000000000 R11: fffffbfff2065937 R12: 0000000000000000
R13: ffff8881161440d8 R14: ffff88817435aa00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a923d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555580dc7a28 CR3: 00000001b8c38000 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/0x10e0
 writeback_sb_inodes+0x979/0x19d0
 wb_writeback+0x445/0xb00
 wb_workfn+0x3f8/0xf10
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
