hfsplus: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14048 at fs/hfsplus/bnode.c:671 hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:671
Modules linked in:
CPU: 1 UID: 0 PID: 14048 Comm: syz.3.2074 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hfsplus_bnode_create+0x461/0x4f0 fs/hfsplus/bnode.c:671
Code: a1 8b 89 ee e8 d0 51 8f fe e9 cf fc ff ff e8 26 71 27 ff 4c 89 ef e8 ce 8f e4 08 48 c7 c7 00 bb a1 8b 89 ee e8 b0 51 8f 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:ffffc90004dfee00 EFLAGS: 00010246
RAX: 0000000000000023 RBX: ffff888031278000 RCX: d227be65c95c1900
RDX: ffffc900114bb000 RSI: 000000000000d456 RDI: 000000000000d457
RBP: 0000000000000000 R08: ffffc90004dfeb27 R09: 1ffff920009bfd64
R10: dffffc0000000000 R11: fffff520009bfd65 R12: 0000000000000000
R13: ffff8880312780e0 R14: ffff888024115200 R15: dffffc0000000000
FS:  00007fc11a0266c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0850f71680 CR3: 000000003ff3d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x5af/0x640 fs/hfsplus/btree.c:415
 hfs_btree_inc_height+0xf6/0xb60 fs/hfsplus/brec.c:475
 hfsplus_brec_insert+0x12d/0xcc0 fs/hfsplus/brec.c:75
 __hfsplus_ext_write_extent+0x353/0x5b0 fs/hfsplus/extents.c:107
 __hfsplus_ext_cache_extent+0x89/0xe30 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x444/0x1990 fs/hfsplus/extents.c:459
 hfsplus_get_block+0x411/0x1530 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin fs/buffer.c:2256 [inline]
 cont_write_begin+0x789/0xb50 fs/buffer.c:2594
 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
 cont_expand_zero fs/buffer.c:2522 [inline]
 cont_write_begin+0x2fd/0xb50 fs/buffer.c:2584
 hfsplus_write_begin+0x66/0xb0 fs/hfsplus/inode.c:48
 generic_cont_expand_simple+0x13f/0x210 fs/buffer.c:2485
 hfsplus_setattr+0x169/0x270 fs/hfsplus/inode.c:260
 notify_change+0xb36/0xe40 fs/attr.c:552
 do_truncate+0x1a4/0x220 fs/open.c:68
 vfs_truncate+0x493/0x520 fs/open.c:118
 do_sys_truncate+0xdb/0x190 fs/open.c:141
 __do_sys_truncate fs/open.c:153 [inline]
 __se_sys_truncate fs/open.c:151 [inline]
 __x64_sys_truncate+0x5b/0x70 fs/open.c:151
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc11918eba9
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:00007fc11a026038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007fc1193d6270 RCX: 00007fc11918eba9
RDX: 0000000000000000 RSI: 0000000000148452 RDI: 0000200000000180
RBP: 00007fc119211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1193d6308 R14: 00007fc1193d6270 R15: 00007ffdea404848
 </TASK>