hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 20799 at fs/hfs/bnode.c:438 hfs_bnode_create+0x3d1/0x450 fs/hfs/bnode.c:437
Modules linked in:
CPU: 1 PID: 20799 Comm: syz.4.3198 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:hfs_bnode_create+0x3d1/0x450 fs/hfs/bnode.c:438
Code: 77 1f 8a 89 ee e8 2f 2c 72 07 e9 57 fd ff ff e8 35 f0 4a ff 4c 89 ef e8 4d 17 86 07 48 c7 c7 a0 77 1f 8a 89 ee e8 0f 2c 72 07 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 63 fc ff ff 4c
RSP: 0018:ffffc900036b6e50 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888065cd0000 RCX: 6bb8d992aa704900
RDX: ffffc90010802000 RSI: 000000000002161d RDI: 000000000002161e
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172267a8
R10: ffffed10172267a8 R11: 1ffff110172267a7 R12: 0000000000000000
R13: ffff888065cd00e0 R14: ffff88807a794000 R15: dffffc0000000000
FS:  00007fe17a7746c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2ecf10000 CR3: 0000000067659000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000097 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5b2/0x660 fs/hfs/btree.c:288
 hfs_btree_inc_height+0xf3/0xac0 fs/hfs/brec.c:471
 hfs_brec_insert+0x73e/0xbc0 fs/hfs/brec.c:148
 __hfs_ext_write_extent+0x2a1/0x470 fs/hfs/extent.c:124
 __hfs_ext_cache_extent+0x6b/0x9b0 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x313/0x1280 fs/hfs/extent.c:401
 hfs_get_block+0x3d4/0xbd0 fs/hfs/extent.c:353
 __block_write_begin_int+0x54e/0x15a0 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x58a/0x7b0 fs/buffer.c:2471
 hfs_write_begin+0x92/0xe0 fs/hfs/inode.c:59
 cont_expand_zero fs/buffer.c:2398 [inline]
 cont_write_begin+0x26c/0x7b0 fs/buffer.c:2461
 hfs_write_begin+0x92/0xe0 fs/hfs/inode.c:59
 hfs_file_truncate+0x18f/0x9c0 fs/hfs/extent.c:494
 hfs_inode_setattr+0x4ab/0x6f0 fs/hfs/inode.c:657
 notify_change+0xbcd/0xee0 fs/attr.c:505
 do_truncate+0x197/0x220 fs/open.c:65
 do_sys_ftruncate+0x31b/0x3d0 fs/open.c:193
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe17c90c929
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:00007fe17a774038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fe17cb33fa0 RCX: 00007fe17c90c929
RDX: 0000000000000000 RSI: 00000000003af001 RDI: 000000000000000a
RBP: 00007fe17c98eb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe17cb33fa0 R15: 00007ffcf1fa4c38
 </TASK>