hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#0: kworker/u10:13/4654
Modules linked in:
CPU: 0 UID: 0 PID: 4654 Comm: kworker/u10:13 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-7:6)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: 82 8b 89 ee e8 00 b1 86 fe e9 cf fc ff ff e8 46 ff 1f ff 4c 89 ef e8 fe 2f bb 08 48 c7 c7 c0 b5 82 8b 89 ee e8 e0 b0 86 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:ffffc9000a4fec20 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8881764e4000 RCX: d62c1216654da900
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc9000a4fe9a7 R09: 1ffff9200149fd34
R10: dffffc0000000000 R11: fffff5200149fd35 R12: 0000000000000000
R13: ffff8881764e40e0 R14: ffff88816b507d00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818e821000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003240 CR3: 00000001132ba000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640
 hfs_btree_inc_height+0xf6/0xac0
 hfs_brec_insert+0x7ee/0xc80
 __hfs_ext_write_extent+0x2a1/0x470
 hfs_ext_write_extent+0x161/0x1e0
 hfs_write_inode+0xc6/0x8a0
 __writeback_single_inode+0x7e1/0x1240
 writeback_sb_inodes+0x93a/0x1870
 wb_writeback+0x42b/0xaa0
 wb_workfn+0x3f9/0xed0
 process_scheduled_works+0xad1/0x1770
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x510/0xa50
 ret_from_fork_asm+0x1a/0x30
 </TASK>
