hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5706 at fs/hfs/bnode.c:530 hfs_bnode_create+0x3d1/0x450 fs/hfs/bnode.c:529
Modules linked in:
CPU: 0 PID: 5706 Comm: syz.3.443 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:hfs_bnode_create+0x3d1/0x450 fs/hfs/bnode.c:530
Code: 96 3f 8a 89 ee e8 8f f2 81 07 e9 57 fd ff ff e8 55 d0 49 ff 4c 89 ef e8 5d 07 96 07 48 c7 c7 80 96 3f 8a 89 ee e8 6f f2 81 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:ffffc9000354ee50 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff888071c6c000 RCX: 0ccfede4fdc10200
RDX: ffffc900059b1000 RSI: 0000000000023ef1 RDI: 0000000000023ef2
RBP: 0000000000000000 R08: ffff8880b9033d7f R09: 1ffff110172067af
R10: dffffc0000000000 R11: ffffed10172067b0 R12: 0000000000000000
R13: ffff888071c6c0e0 R14: ffff8880288ca700 R15: dffffc0000000000
FS:  00007fd1f42696c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd527b48198 CR3: 0000000066bb1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5b8/0x670 fs/hfs/btree.c:288
 hfs_btree_inc_height+0xfd/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x744/0xbd0 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+0x39c/0x13f0 fs/hfs/extent.c:401
 hfs_get_block+0x40f/0xc50 fs/hfs/extent.c:353
 __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin fs/buffer.c:2122 [inline]
 cont_write_begin+0x598/0x7b0 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+0x263/0x7b0 fs/buffer.c:2461
 hfs_write_begin+0x92/0xe0 fs/hfs/inode.c:59
 hfs_file_truncate+0x1c2/0xa10 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+0x1ac/0x240 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: 0033:0x7fd1f600deb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd1f4269028 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fd1f6288fa0 RCX: 00007fd1f600deb9
RDX: 0000000000000000 RSI: 000000000000c17a RDI: 0000000000000004
RBP: 00007fd1f607bc1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1f6289038 R14: 00007fd1f6288fa0 R15: 00007ffed79892a8
 </TASK>