hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5598 at fs/hfs/bnode.c:520 hfs_bnode_create+0x37a/0x400 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 PID: 5598 Comm: syz.1.249 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:hfs_bnode_create+0x37a/0x400 fs/hfs/bnode.c:520
Code: 96 a2 8a 89 ee e8 16 87 c5 07 e9 ab fd ff ff e8 6c a4 39 ff 48 89 df e8 64 aa da 07 48 c7 c7 40 97 a2 8a 89 ee e8 f6 86 c5 07 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c b7 fc ff ff 4c
RSP: 0018:ffffc900038b6fc0 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888072c5a0e0 RCX: fdd76939b5d20e00
RDX: ffffc9000c849000 RSI: 0000000000017022 RDI: 0000000000017023
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff52000716d99
R10: fffff52000716d99 R11: 1ffff92000716d98 R12: 0000000000000000
R13: ffff888072c5a000 R14: ffff8880279f1700 R15: dffffc0000000000
FS:  00007f3c0d9cc6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f46786ddd58 CR3: 00000000639ee000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x537/0x5c0 fs/hfs/btree.c:291
 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+0x54b/0x1a70 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x96/0x1e0 fs/buffer.c:2102
 cont_write_begin+0x5c4/0x7d0 fs/buffer.c:2456
 hfs_write_begin+0x87/0xd0 fs/hfs/inode.c:58
 generic_perform_write+0x2db/0x560 mm/filemap.c:3846
 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974
 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x44c/0x960 fs/read_write.c:584
 ksys_write+0x143/0x240 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3c0cb8efc9
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:00007f3c0d9cc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3c0cde5fa0 RCX: 00007f3c0cb8efc9
RDX: 00000000000101bf RSI: 0000200000000380 RDI: 0000000000000004
RBP: 00007f3c0cc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c0cde6038 R14: 00007f3c0cde5fa0 R15: 00007ffd0a880c98
 </TASK>