hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 0 PID: 15762 at fs/hfs/bnode.c:520 hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:519
Modules linked in:
CPU: 0 PID: 15762 Comm: syz.6.2560 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: d2 e0 8a 89 ee e8 67 a1 1e 08 e9 73 fd ff ff e8 ad 28 2d ff 4c 89 ef e8 95 c9 33 08 48 c7 c7 80 d2 e0 8a 89 ee e8 47 a1 1e 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:ffffc90004ceee18 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8880597b2000 RCX: 66bf690c0ff8a300
RDX: ffffc9000d6a2000 RSI: 0000000000015867 RDI: 0000000000015868
RBP: 0000000000000000 R08: ffffc90004ceeb27 R09: 1ffff9200099dd64
R10: dffffc0000000000 R11: fffff5200099dd65 R12: 0000000000000000
R13: ffff8880597b20e0 R14: ffff88802b5d8c00 R15: dffffc0000000000
FS:  00007ff35c6cf6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3101fff8 CR3: 0000000060b15000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x541/0x5d0 fs/hfs/btree.c:326
 hfs_btree_inc_height+0x101/0xac0 fs/hfs/brec.c:490
 hfs_brec_insert+0x748/0xbd0 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+0x3a0/0x1380 fs/hfs/extent.c:401
 hfs_get_block+0x413/0xc50 fs/hfs/extent.c:353
 __block_write_begin_int+0x57f/0x1af0 fs/buffer.c:2124
 __block_write_begin fs/buffer.c:2173 [inline]
 block_write_begin+0x9a/0x1e0 fs/buffer.c:2234
 cont_write_begin+0x5ee/0x810 fs/buffer.c:2591
 hfs_write_begin+0x8b/0xd0 fs/hfs/inode.c:58
 cont_expand_zero fs/buffer.c:2518 [inline]
 cont_write_begin+0x2b1/0x810 fs/buffer.c:2581
 hfs_write_begin+0x8b/0xd0 fs/hfs/inode.c:58
 hfs_file_truncate+0x1c4/0xa10 fs/hfs/extent.c:494
 hfs_inode_setattr+0x4af/0x6e0 fs/hfs/inode.c:659
 notify_change+0xb0d/0xe10 fs/attr.c:499
 do_truncate+0x1b0/0x240 fs/open.c:66
 do_sys_ftruncate+0x325/0x3d0 fs/open.c:194
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff35b79aeb9
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:00007ff35c6cf028 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007ff35ba15fa0 RCX: 00007ff35b79aeb9
RDX: 0000000000000000 RSI: 000000000000c17a RDI: 0000000000000004
RBP: 00007ff35b808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff35ba16038 R14: 00007ff35ba15fa0 R15: 00007ffcd9002ab8
 </TASK>