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.0.0/5346
Modules linked in:
CPU: 0 UID: 0 PID: 5346 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: a2 8b 89 ee e8 00 c8 85 fe e9 cf fc ff ff e8 46 de 1f ff 4c 89 ef e8 ce 6b be 08 48 c7 c7 00 97 a2 8b 89 ee e8 e0 c7 85 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:ffffc9000e726f20 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff888041548000 RCX: 4d4781c9569d0f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc9000e726c47 R09: 1ffff92001ce4d88
R10: dffffc0000000000 R11: fffff52001ce4d89 R12: 0000000000000000
R13: ffff8880415480e0 R14: ffff8880231a0e00 R15: dffffc0000000000
FS:  00007fbda2c156c0(0000) GS:ffff88808d22a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000003f6dc000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x746/0xaf0 fs/hfsplus/btree.c:421
 hfs_btree_inc_height+0xf6/0xb60 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x12e/0xd70 fs/hfsplus/brec.c:75
 hfsplus_create_attr+0x30a/0x470 fs/hfsplus/attributes.c:252
 __hfsplus_setxattr+0x66b/0x2170 fs/hfsplus/xattr.c:356
 hfsplus_setxattr+0x11e/0x180 fs/hfsplus/xattr.c:434
 hfsplus_user_setxattr+0x40/0x60 fs/hfsplus/xattr_user.c:30
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x274/0x600 fs/xattr.c:665
 path_setxattrat+0x364/0x3a0 fs/xattr.c:713
 __do_sys_setxattr fs/xattr.c:747 [inline]
 __se_sys_setxattr fs/xattr.c:743 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbda1d8f7c9
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:00007fbda2c15038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007fbda1fe6180 RCX: 00007fbda1d8f7c9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000200000000000
RBP: 00007fbda1e13f91 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbda1fe6218 R14: 00007fbda1fe6180 R15: 00007ffc3e6b3e98
 </TASK>