hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: fs/hfsplus/bnode.c:631 at hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:631, CPU#0: syz.0.0/5333
Modules linked in:
CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:631
Code: 82 8b 89 ee e8 20 c9 86 fe e9 cf fc ff ff e8 e6 27 20 ff 4c 89 ef e8 ee 57 bd 08 48 c7 c7 80 97 82 8b 89 ee e8 00 c9 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:ffffc9000e42f3a0 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff88801f37a000 RCX: 1c1ae07a839fee00
RDX: ffffc90020ca2000 RSI: 0000000000003a30 RDI: 0000000000003a31
RBP: 0000000000000000 R08: ffffc9000e42f127 R09: 1ffff92001c85e24
R10: dffffc0000000000 R11: fffff52001c85e25 R12: 0000000000000000
R13: ffff88801f37a0e0 R14: ffff8880127aeb00 R15: dffffc0000000000
FS:  00007f1c4b2e86c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c4a59aeb8 CR3: 000000004079e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x746/0xaf0 fs/hfsplus/btree.c:421
 hfs_bnode_split+0xcc/0x1080 fs/hfsplus/brec.c:245
 hfsplus_brec_insert+0x3b6/0xd70 fs/hfsplus/brec.c:100
 hfsplus_rename_cat+0x523/0xf40 fs/hfsplus/catalog.c:491
 hfsplus_unlink+0x2e7/0x730 fs/hfsplus/dir.c:376
 vfs_unlink+0x380/0x640 fs/namei.c:5369
 do_unlinkat+0x2cf/0x560 fs/namei.c:5439
 __do_sys_unlink fs/namei.c:5474 [inline]
 __se_sys_unlink fs/namei.c:5472 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:5472
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c4a38f7c9
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:00007f1c4b2e8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f1c4a5e6090 RCX: 00007f1c4a38f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f1c4a413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c4a5e6128 R14: 00007f1c4a5e6090 R15: 00007ffd60fa4eb8
 </TASK>