hpfs: filesystem error: warning: spare dnodes used, try chkdsk
hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
HPFS: de_[  151.891409][ T6619] HPFS: de_next_de: de->length = 84ba
HPFS: dnode_end_de: dnode->first_free = 7b3184b6
==================================================================
BUG: KASAN: slab-out-of-bounds in hpfs_count_dnodes+0x874/0xb70 fs/hpfs/dnode.c:773
Read of size 2 at addr ffff888021edd4d0 by task syz.3.20/6619

CPU: 1 UID: 0 PID: 6619 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 hpfs_count_dnodes+0x874/0xb70 fs/hpfs/dnode.c:773
 hpfs_read_inode+0xc79/0x1050 fs/hpfs/inode.c:128
 hpfs_fill_super+0x123d/0x1fa0 fs/hpfs/super.c:651
 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3760 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3836
 do_mount fs/namespace.c:4159 [inline]
 __do_sys_mount fs/namespace.c:4348 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff18a06b90a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ff1896cde58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff1896cdee0 RCX: 00007ff18a06b90a
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007ff1896cdea0
RBP: 000020000000a000 R08: 00007ff1896cdee0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007ff1896cdea0 R14: 0000000000009e21 R15: 0000200000000000
 </TASK>

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_node_track_caller_noprof+0x372/0x7e0 mm/slub.c:5327
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x42/0x100 mm/util.c:84
 __kmem_cache_create_args+0x25a/0x450 mm/slab_common.c:373
 proto_register+0x26b/0xb20 net/core/sock.c:4203
 inet_init+0x85/0x430 net/ipv4/af_inet.c:1908
 do_one_initcall+0x250/0x8d0 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
 kernel_init+0x1d/0x1d0 init/main.c:1582
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888021edd4c0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 12 bytes to the right of
 allocated 4-byte region [ffff888021edd4c0, ffff888021edd4c4)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21edd
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88813fe17500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3541701348, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3255 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3444
 new_slab mm/slub.c:3502 [inline]
 refill_objects+0x334/0x3c0 mm/slub.c:7134
 refill_sheaf mm/slub.c:2804 [inline]
 __pcs_replace_empty_main+0x328/0x5f0 mm/slub.c:4578
 alloc_from_pcs mm/slub.c:4681 [inline]
 slab_alloc_node mm/slub.c:4815 [inline]
 __do_kmalloc_node mm/slub.c:5218 [inline]
 __kmalloc_noprof+0x530/0x7b0 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 kzalloc_noprof include/linux/slab.h:1200 [inline]
 acpi_ns_internalize_name+0x2c9/0x3e0 drivers/acpi/acpica/nsutils.c:331
 acpi_ns_get_node_unlocked+0x186/0x480 drivers/acpi/acpica/nsutils.c:666
 acpi_ns_get_node+0x76/0xc0 drivers/acpi/acpica/nsutils.c:726
 acpi_ns_evaluate+0x283/0x1230 drivers/acpi/acpica/nseval.c:62
 acpi_evaluate_object+0x657/0xd50 drivers/acpi/acpica/nsxfeval.c:354
 acpi_evaluate_integer+0x112/0x320 drivers/acpi/utils.c:260
 acpi_bus_get_status_handle drivers/acpi/bus.c:82 [inline]
 acpi_bus_get_status+0x150/0x3e0 drivers/acpi/bus.c:111
 acpi_bus_attach+0x1d4/0xc10 drivers/acpi/scan.c:2303
 device_for_each_child+0x10b/0x1a0 drivers/base/core.c:4018
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888021edd380: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888021edd400: fa fc fc fc fa fc fc fc 00 fc fc fc 05 fc fc fc
>ffff888021edd480: 06 fc fc fc 05 fc fc fc 04 fc fc fc 04 fc fc fc
                                                 ^
 ffff888021edd500: 04 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888021edd580: 07 fc fc fc fa fc fc fc 05 fc fc fc 06 fc fc fc
==================================================================