hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6338 at fs/hfs/bnode.c:520 hfs_bnode_create+0x461/0x4f0
Modules linked in:
CPU: 1 UID: 0 PID: 6338 Comm: syz.0.50 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
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:ffffc90002a9f340 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88811235c000 RCX: c9b6880a3ff1d400
RDX: ffffc900080b9000 RSI: 0000000000000e05 RDI: 0000000000000e06
RBP: 0000000000000000 R08: ffffc90002a9f067 R09: 1ffff92000553e0c
R10: dffffc0000000000 R11: fffff52000553e0d R12: 0000000000000000
R13: ffff88811235c0e0 R14: ffff8881098df500 R15: dffffc0000000000
FS:  00007f09658a16c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32519ff8 CR3: 0000000107c0c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5bb/0x640
 hfs_bnode_split+0xcc/0xef0
 hfs_brec_insert+0x377/0xbd0
 hfs_cat_create+0x461/0x640
 hfs_create+0x66/0xe0
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f096498ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f09658a1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0964bc5fa0 RCX: 00007f096498ebe9
RDX: 000000000000275a RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f0964a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0964bc6038 R14: 00007f0964bc5fa0 R15: 00007ffcd7c246c8
 </TASK>
