pci 0000:00:04.0: [1af4:1000] type 00 class 0x020000 conventional PCI endpoint
pci 0000:00:04.0: BAR 0 [io  0x1000-0x103f]
pci 0000:00:04.0: BAR 1 [mem 0xc0000000-0xc000007f]
pci 0000:00:04.0: BAR 1 [mem 0xc0000000-0xc000007f]: assigned
pci 0000:00:04.0: BAR 0 [io  0x1000-0x103f]: assigned
==================================================================
BUG: KASAN: slab-use-after-free in acpi_ut_update_object_reference+0x33b/0x730 drivers/acpi/acpica/utdelete.c:544
Read of size 1 at addr ffff88810d640bd1 by task syz.2.73/1330

CPU: 1 UID: 0 PID: 1330 Comm: syz.2.73 Not tainted syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 print_address_description+0x71/0x210 mm/kasan/report.c:377
 print_report+0x4a/0x70 mm/kasan/report.c:481
 kasan_report+0x162/0x1a0 mm/kasan/report.c:594
 __asan_report_load1_noabort+0x18/0x20 mm/kasan/report_generic.c:378
 acpi_ut_update_object_reference+0x33b/0x730 drivers/acpi/acpica/utdelete.c:544
 acpi_ut_add_reference+0x3d/0x50 drivers/acpi/acpica/utdelete.c:694
 acpi_ex_resolve_node_to_value+0x680/0x730 drivers/acpi/acpica/exresnte.c:-1
 acpi_ns_evaluate+0x78b/0xa60 drivers/acpi/acpica/nseval.c:238
 acpi_ut_evaluate_object+0x15a/0x5b0 drivers/acpi/acpica/uteval.c:60
 acpi_rs_get_prt_method_data+0x96/0x110 drivers/acpi/acpica/rsutils.c:446
 acpi_get_irq_routing_table+0xb8/0xe0 drivers/acpi/acpica/rsxface.c:137
 acpi_pci_irq_find_prt_entry+0x164/0x1010 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0x44/0x5a0 drivers/acpi/pci_irq.c:298
 acpi_pci_irq_enable+0x1c2/0x5e0 drivers/acpi/pci_irq.c:413
 pcibios_enable_device+0xe4/0x140 arch/x86/pci/common.c:699
 do_pci_enable_device+0x1e0/0x3e0 drivers/pci/pci.c:2118
 pci_enable_device_flags+0x45e/0x510 drivers/pci/pci.c:2203
 pci_enable_device+0x1e/0xc0 drivers/pci/pci.c:2236
 virtio_pci_probe+0x1ab/0x400 drivers/virtio/virtio_pci_common.c:702
 local_pci_probe drivers/pci/pci-driver.c:335 [inline]
 pci_call_probe drivers/pci/pci-driver.c:403 [inline]
 __pci_device_probe drivers/pci/pci-driver.c:428 [inline]
 pci_device_probe+0x282/0x440 drivers/pci/pci-driver.c:462
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2e1/0x8b0 drivers/base/dd.c:657
 __driver_probe_device+0x193/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c4/0x3c0 drivers/base/dd.c:1029
 device_attach+0x1b/0x40 drivers/base/dd.c:1072
 pci_bus_add_device+0x11f/0x1f0 drivers/pci/bus.c:378
 pci_bus_add_devices+0x98/0x1c0 drivers/pci/bus.c:401
 pci_rescan_bus+0x30/0x40 drivers/pci/probe.c:3440
 rescan_store+0xcd/0x150 drivers/pci/pci-sysfs.c:463
 bus_attr_store+0x91/0xb0 drivers/base/bus.c:172
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f6e4c39e559
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:00007f6e4d2c6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6e4c626090 RCX: 00007f6e4c39e559
RDX: 000000000000001e RSI: 0000200000000280 RDI: 0000000000000005
RBP: 00007f6e4c435ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e4c626128 R14: 00007f6e4c626090 R15: 00007ffc9dbf5f48
 </TASK>

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565
 unpoison_slab_object mm/kasan/common.c:321 [inline]
 __kasan_slab_alloc+0x73/0x90 mm/kasan/common.c:347
 kasan_slab_alloc include/linux/kasan.h:251 [inline]
 slab_post_alloc_hook mm/slub.c:4202 [inline]
 slab_alloc_node mm/slub.c:4251 [inline]
 kmem_cache_alloc_noprof+0x1bf/0x410 mm/slub.c:4260
 acpi_ut_allocate_object_desc_dbg+0xf2/0x270 drivers/acpi/acpica/utobject.c:359
 acpi_ut_create_internal_object_dbg+0x2a/0x290 drivers/acpi/acpica/utobject.c:69
 acpi_ds_build_internal_package_obj+0x18e/0xc20 drivers/acpi/acpica/dspkginit.c:92
 acpi_ds_eval_data_object_operands+0x2e3/0x530 drivers/acpi/acpica/dsopcode.c:638
 acpi_ds_exec_end_op+0xbd5/0x1210 drivers/acpi/acpica/dswexec.c:-1
 acpi_ps_parse_loop+0xc83/0x1ac0 drivers/acpi/acpica/psloop.c:525
 acpi_ps_parse_aml+0x218/0x9b0 drivers/acpi/acpica/psparse.c:475
 acpi_ps_execute_table+0x336/0x420 drivers/acpi/acpica/psxface.c:295
 acpi_ns_execute_table+0x396/0x670 drivers/acpi/acpica/nsparse.c:116
 acpi_ns_parse_table+0x21/0x30 drivers/acpi/acpica/nsparse.c:268
 acpi_ns_load_table+0x6f/0x130 drivers/acpi/acpica/nsload.c:71
 acpi_tb_load_namespace+0x290/0x6d0 drivers/acpi/acpica/tbxfload.c:158
 acpi_load_tables+0x4b/0x100 drivers/acpi/acpica/tbxfload.c:59
 acpi_bus_init+0x8e/0x700 drivers/acpi/bus.c:1343
 acpi_init+0xc5/0x23b drivers/acpi/bus.c:1454
 do_one_initcall+0x1e8/0x6a0 init/main.c:1406
 do_initcall_level+0x174/0x2e5 init/main.c:1468
 do_initcalls+0x7e/0x160 init/main.c:1484
 do_basic_setup+0x95/0xb0 init/main.c:1503
 kernel_init_freeable+0x2b1/0x400 init/main.c:1717
 kernel_init+0x21/0x1e0 init/main.c:1606
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 1328:
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_free_info+0x44/0x50 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:249 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:266
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2445 [inline]
 slab_free mm/slub.c:4714 [inline]
 kmem_cache_free+0x1bd/0x4f0 mm/slub.c:4825
 acpi_os_release_object+0x21/0x30 drivers/acpi/osl.c:1612
 acpi_ut_delete_object_desc+0x80/0xe0 drivers/acpi/acpica/utobject.c:402
 acpi_ut_delete_internal_obj drivers/acpi/acpica/utdelete.c:316 [inline]
 acpi_ut_update_ref_count+0xb52/0xc80 drivers/acpi/acpica/utdelete.c:436
 acpi_ut_update_object_reference+0x487/0x730 drivers/acpi/acpica/utdelete.c:632
 acpi_ut_remove_reference+0x87/0xb0 drivers/acpi/acpica/utdelete.c:740
 acpi_rs_get_prt_method_data+0xcd/0x110 drivers/acpi/acpica/rsutils.c:460
 acpi_get_irq_routing_table+0xb8/0xe0 drivers/acpi/acpica/rsxface.c:137
 acpi_pci_irq_find_prt_entry+0x164/0x1010 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0x44/0x5a0 drivers/acpi/pci_irq.c:298
 acpi_pci_irq_disable+0x171/0x2f0 drivers/acpi/pci_irq.c:495
 pcibios_disable_device+0xc0/0x120 arch/x86/pci/common.c:706
 do_pci_disable_device drivers/pci/pci.c:2284 [inline]
 pci_disable_device+0x162/0x2d0 drivers/pci/pci.c:2318
 virtio_pci_remove+0xc2/0xf0 drivers/virtio/virtio_pci_common.c:766
 pci_device_remove+0xab/0x260 drivers/pci/pci-driver.c:485
 device_remove drivers/base/dd.c:567 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x4ad/0x830 drivers/base/dd.c:1295
 device_release_driver+0x1d/0x30 drivers/base/dd.c:1318
 pci_stop_dev drivers/pci/remove.c:44 [inline]
 pci_stop_bus_device+0x10c/0x160 drivers/pci/remove.c:109
 pci_stop_and_remove_bus_device drivers/pci/remove.c:143 [inline]
 pci_stop_and_remove_bus_device_locked+0x1e/0x40 drivers/pci/remove.c:151
 remove_store+0xe6/0x150 drivers/pci/pci-sysfs.c:513
 dev_attr_store+0x73/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x141/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x319/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

The buggy address belongs to the object at ffff88810d640bc8
 which belongs to the cache Acpi-Operand of size 72
The buggy address is located 9 bytes inside of
 freed 72-byte region [ffff88810d640bc8, ffff88810d640c10)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d640
anon flags: 0x4000000000000000(zone=1)
page_type: f5(slab)
raw: 4000000000000000 ffff888100a43dc0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000270027 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 1762908337, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1864
 prep_new_page+0x2d/0x180 mm/page_alloc.c:1872
 get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3949
 __alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5316
 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1
 allocate_slab+0x69/0x430 mm/slub.c:2687
 new_slab mm/slub.c:2741 [inline]
 ___slab_alloc+0x591/0x8c0 mm/slub.c:3934
 __slab_alloc mm/slub.c:4025 [inline]
 __slab_alloc_node mm/slub.c:4078 [inline]
 slab_alloc_node mm/slub.c:4239 [inline]
 kmem_cache_alloc_noprof+0x290/0x410 mm/slub.c:4260
 acpi_ut_allocate_object_desc_dbg+0xf2/0x270 drivers/acpi/acpica/utobject.c:359
 acpi_ut_create_internal_object_dbg+0x2a/0x290 drivers/acpi/acpica/utobject.c:69
 acpi_ds_create_operand+0x2ea/0x8c0 drivers/acpi/acpica/dsutils.c:617
 acpi_ds_create_operands+0x275/0x420 drivers/acpi/acpica/dsutils.c:707
 acpi_ds_eval_region_operands+0xa5/0x530 drivers/acpi/acpica/dsopcode.c:382
 acpi_ds_exec_end_op+0xa00/0x1210 drivers/acpi/acpica/dswexec.c:649
 acpi_ps_parse_loop+0xc83/0x1ac0 drivers/acpi/acpica/psloop.c:525
 acpi_ps_parse_aml+0x218/0x9b0 drivers/acpi/acpica/psparse.c:475
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810d640a80: fc fc 00 00 00 00 00 00 00 00 00 fc fc fc fc fa
 ffff88810d640b00: fb fb fb fb fb fb fb fb fc fc fc fc 00 00 00 00
>ffff88810d640b80: 00 00 00 00 00 fc fc fc fc fa fb fb fb fb fb fb
                                                 ^
 ffff88810d640c00: fb fb fc fc fc fc 00 00 00 00 00 00 00 00 00 fc
 ffff88810d640c80: fc fc fc fa fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
ACPI Warning: Obj ffff88810d643e38, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d6431a0, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d6409c0, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d640dd0, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d6405b0, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d6400d0, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: Obj ffff88810d640bc8, Reference Count was zero before increment
 (20240827/utdelete-397)
ACPI Warning: \_SB.PCI0._PRT: Return Package type mismatch at index 0 - found Invalid object, expected Integer (20240827/nspredef-260)
ACPI Warning: \_SB.PCI0._PRT: PRT[0]: Fixed reversed SourceName and SourceIndex (20240827/nsrepair2-617)
ACPI Error: (PRT[0]) Need package of length 4, found length 128 (20240827/rscreate-248)
ACPI Error: ffff88810d643e38 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d6431a0 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d6409c0 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d6405b0 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d640dd0 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d6400d0 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
ACPI Error: ffff88810d640bc8 is not an ACPI Operand object [Not a Descriptor] (20240827/utobject-396)
virtio-pci 0000:00:04.0: can't derive routing for PCI INT A
virtio-pci 0000:00:04.0: PCI INT A: no GSI
virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver