hfsplus: new node 0 already hashed?
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WARNING: fs/hfsplus/bnode.c:631 at hfsplus_bnode_create+0x461/0x4f0, CPU#0: syz.7.1819/22026
Modules linked in:
CPU: 0 UID: 0 PID: 22026 Comm: syz.7.1819 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:hfsplus_bnode_create+0x461/0x4f0
Code: a2 8b 89 ee e8 c0 ca 83 fe e9 cf fc ff ff e8 a6 55 1e ff 4c 89 ef e8 de a8 d7 08 48 c7 c7 00 95 a2 8b 89 ee e8 a0 ca 83 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:ffffc9000372f500 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff88811e5f6000 RCX: 7089e553cc030000
RDX: ffffc900247d9000 RSI: 00000000000035ac RDI: 00000000000035ad
RBP: 0000000000000000 R08: ffffc9000372f287 R09: 1ffff920006e5e50
R10: dffffc0000000000 R11: fffff520006e5e51 R12: 0000000000000000
R13: ffff88811e5f60e0 R14: ffff8881067c3b00 R15: dffffc0000000000
FS:  00007fd0549d06c0(0000) GS:ffff88818e3f4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd04981f000 CR3: 000000019f3da000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x747/0xb00
 hfs_bnode_split+0xd4/0x1090
 hfsplus_brec_insert+0x3bc/0xd70
 hfsplus_create_cat+0x426/0x11b0
 hfsplus_mknod+0x16a/0x290
 vfs_create+0x2d1/0x460
 do_mknodat+0x3f1/0x680
 __x64_sys_mknod+0x8c/0xa0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd053b9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd0549d0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fd053e15fa0 RCX: 00007fd053b9acb9
RDX: 000000000000070f RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007fd053c08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd053e16038 R14: 00007fd053e15fa0 R15: 00007fff1242b4c8
 </TASK>
