loop8: detected capacity change from 0 to 64
hfs: unable to locate alternate MDB
hfs: continuing without an alternate MDB
hfs: new node 0 already hashed?
------------[ cut here ]------------
WARNING: CPU: 1 PID: 11379 at fs/hfs/bnode.c:520 hfs_bnode_create+0x3b9/0x440 fs/hfs/bnode.c:519
Modules linked in:
CPU: 1 PID: 11379 Comm: syz.8.1266 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:ffffc9000c1af018 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff88807f3c8000 RCX: 500b83352afefa00
RDX: ffffc9000ea30000 RSI: 000000000002ab29 RDI: 000000000002ab2a
RBP: 0000000000000000 R08: ffffc9000c1aed27 R09: 1ffff92001835da4
R10: dffffc0000000000 R11: fffff52001835da5 R12: 0000000000000000
R13: ffff88807f3c80e0 R14: ffff88802f6a0800 R15: dffffc0000000000
FS:  00007fd350d876c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000e0000 CR3: 000000002ef78000 CR4: 00000000003506e0
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
 generic_perform_write+0x2fe/0x5c0 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+0x46c/0x990 fs/read_write.c:584
 ksys_pwrite64 fs/read_write.c:699 [inline]
 __do_sys_pwrite64 fs/read_write.c:709 [inline]
 __se_sys_pwrite64 fs/read_write.c:706 [inline]
 __x64_sys_pwrite64+0x19b/0x230 fs/read_write.c:706
 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: 0033:0x7fd34ff9acb9
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:00007fd350d87028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fd350215fa0 RCX: 00007fd34ff9acb9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007fd350008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd350216038 R14: 00007fd350215fa0 R15: 00007fff39325f68
 </TASK>