hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#1: kworker/u10:3/1091
Modules linked in:
CPU: 1 UID: 0 PID: 1091 Comm: kworker/u10:3 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-7:1)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: a7 8b 89 ee e8 d0 9a 82 fe e9 cf fc ff ff e8 86 8b 1d ff 4c 89 ef e8 0e 59 d6 08 48 c7 c7 e0 87 a7 8b 89 ee e8 b0 9a 82 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:ffffc90007eaec20 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8881755d8000 RCX: ea300220ab720400
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90007eae9a7 R09: 1ffff92000fd5d34
R10: dffffc0000000000 R11: fffff52000fd5d35 R12: 0000000000000000
R13: ffff8881755d80e0 R14: ffff88816f27eb00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8882a9926000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d8d0ff000 CR3: 000000016af3a000 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+0x7e1/0x1230
 writeback_sb_inodes+0x92c/0x1820
 wb_writeback+0x445/0xad0
 wb_workfn+0x3f8/0xef0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
