hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7153 at fs/hfs/bnode.c:520 hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:519
Modules linked in:
CPU: 0 PID: 7153 Comm: syz.1.289 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:520
Code: c3 c0 8a 89 ee e8 57 13 06 08 e9 73 fd ff ff e8 ad 78 2f ff 4c 89 ef e8 e5 01 1b 08 48 c7 c7 80 c3 c0 8a 89 ee e8 37 13 06 08 <0f> 0b eb b7 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 7f fc ff ff 4c
RSP: 0018:ffffc9000f66f018 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8880313ca000 RCX: b22d3c8ad21ca100
RDX: ffffc9000ca1a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffffc9000f66ed27 R09: 1ffff92001ecdda4
R10: dffffc0000000000 R11: fffff52001ecdda5 R12: 0000000000000000
R13: ffff8880313ca0e0 R14: ffff888024f55500 R15: dffffc0000000000
FS:  00007fe7c317b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9302194000 CR3: 000000006028f000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x53b/0x5c0 fs/hfs/btree.c:326
 hfs_btree_inc_height+0xf7/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x742/0xbd0 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+0x317/0x1220 fs/hfs/extent.c:401
 hfs_get_block+0x3d8/0xbd0 fs/hfs/extent.c:353
 __block_write_begin_int+0x566/0x1ad0 fs/buffer.c:2124
 __block_write_begin fs/buffer.c:2173 [inline]
 block_write_begin+0x9a/0x1e0 fs/buffer.c:2234
 cont_write_begin+0x5c8/0x7e0 fs/buffer.c:2591
 hfs_write_begin+0x8b/0xd0 fs/hfs/inode.c:58
 generic_perform_write+0x2fb/0x5b0 mm/filemap.c:4031
 generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4152
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x43b/0x940 fs/read_write.c:584
 ksys_write+0x147/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe7c238f749
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:00007fe7c317b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe7c25e5fa0 RCX: 00007fe7c238f749
RDX: 00000000175d9003 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007fe7c2413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7c25e6038 R14: 00007fe7c25e5fa0 R15: 00007ffed6f436f8
 </TASK>