</TASK>
pci 0000:00:04.0: [1af4:1000] type 00 class 0x020000
pci 0000:00:04.0: reg 0x10: [io  0x1000-0x103f]
pci 0000:00:04.0: reg 0x14: [mem 0xc0000000-0xc000007f]
pci 0000:00:04.0: BAR 1: assigned [mem 0xc0000000-0xc000007f]
pci 0000:00:04.0: BAR 0: assigned [io  0x1000-0x103f]
==================================================================
BUG: KASAN: use-after-free in acpi_ns_get_attached_object+0xf3/0x110 drivers/acpi/acpica/nsobject.c:258
Read of size 1 at addr ffff8881067dca98 by task syz.6.38/527

CPU: 0 PID: 527 Comm: syz.6.38 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 acpi_ns_get_attached_object+0xf3/0x110 drivers/acpi/acpica/nsobject.c:258
 acpi_ns_evaluate+0x161/0xa20 drivers/acpi/acpica/nseval.c:83
 acpi_ut_evaluate_object+0x12f/0x480 drivers/acpi/acpica/uteval.c:60
 acpi_rs_get_prt_method_data+0x92/0x110 drivers/acpi/acpica/rsutils.c:446
 acpi_get_irq_routing_table+0xb4/0xe0 drivers/acpi/acpica/rsxface.c:137
 acpi_pci_irq_find_prt_entry+0x160/0xe70 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0x40/0x580 drivers/acpi/pci_irq.c:298
 acpi_pci_irq_enable+0x1da/0x670 drivers/acpi/pci_irq.c:411
 pcibios_enable_device+0xc7/0x120 arch/x86/pci/common.c:691
 do_pci_enable_device+0x2c5/0x520 drivers/pci/pci.c:1814
 pci_enable_device_flags+0x6da/0x900 drivers/pci/pci.c:1899
 pci_enable_device+0x1a/0x20 drivers/pci/pci.c:1946
 virtio_pci_probe+0x15c/0x320 drivers/virtio/virtio_pci_common.c:534
 local_pci_probe drivers/pci/pci-driver.c:323 [inline]
 pci_call_probe drivers/pci/pci-driver.c:380 [inline]
 __pci_device_probe drivers/pci/pci-driver.c:405 [inline]
 pci_device_probe+0x27a/0x440 drivers/pci/pci-driver.c:448
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x27d/0x970 drivers/base/dd.c:595
 __driver_probe_device+0x193/0x270 drivers/base/dd.c:755
 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:785
 __device_attach_driver+0x2a6/0x460 drivers/base/dd.c:907
 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
 __device_attach+0x2b0/0x420 drivers/base/dd.c:979
 device_attach+0x17/0x20 drivers/base/dd.c:1022
 pci_bus_add_device+0x7a/0x110 drivers/pci/bus.c:345
 pci_bus_add_devices+0x94/0x1c0 drivers/pci/bus.c:368
 pci_rescan_bus+0x2c/0x40 drivers/pci/probe.c:3289
 rescan_store+0xc9/0x150 drivers/pci/pci-sysfs.c:444
 bus_attr_store+0x79/0xa0 drivers/base/bus.c:124
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:143
 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2218 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0033:0x7fcad94d8b19
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:00007fcad9338028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcad975efa0 RCX: 00007fcad94d8b19
RDX: 000000000000001e RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007fcad9570b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcad975f038 R14: 00007fcad975efa0 R15: 00007ffde8693e48
 </TASK>

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:466
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3245 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260
 kmem_cache_zalloc include/linux/slab.h:740 [inline]
 acpi_os_acquire_object include/acpi/platform/aclinuxex.h:67 [inline]
 acpi_ut_allocate_object_desc_dbg drivers/acpi/acpica/utobject.c:359 [inline]
 acpi_ut_create_internal_object_dbg+0xe9/0x470 drivers/acpi/acpica/utobject.c:69
 acpi_ds_build_internal_object+0x292/0x650 drivers/acpi/acpica/dsobject.c:94
 acpi_ds_create_node+0x96/0x140 drivers/acpi/acpica/dsobject.c:281
 acpi_ds_exec_end_op+0xa44/0x1190 drivers/acpi/acpica/dswexec.c:592
 acpi_ps_parse_loop+0xc49/0x1c50 drivers/acpi/acpica/psloop.c:553
 acpi_ps_parse_aml+0x214/0x9a0 drivers/acpi/acpica/psparse.c:489
 acpi_ps_execute_table+0x332/0x410 drivers/acpi/acpica/psxface.c:295
 acpi_ns_execute_table+0x3ac/0x570 drivers/acpi/acpica/nsparse.c:116
 acpi_ns_parse_table+0x1d/0x30 drivers/acpi/acpica/nsparse.c:268
 acpi_ns_load_table+0x6b/0x130 drivers/acpi/acpica/nsload.c:71
 acpi_tb_load_namespace+0x287/0x6d0 drivers/acpi/acpica/tbxfload.c:158
 acpi_load_tables+0x47/0x100 drivers/acpi/acpica/tbxfload.c:59
 acpi_bus_init+0x8a/0x720 drivers/acpi/bus.c:1231
 acpi_init+0xbc/0x220 drivers/acpi/bus.c:1344
 do_one_initcall+0x1fc/0x5a0 init/main.c:1279
 do_initcall_level+0x174/0x2e0 init/main.c:1352
 do_initcalls+0x50/0xa0 init/main.c:1368
 do_basic_setup+0x81/0x90 init/main.c:1387
 kernel_init_freeable+0x298/0x3d0 init/main.c:1592
 kernel_init+0x1d/0x1b0 init/main.c:1483
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Freed by task 526:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kmem_cache_free+0x100/0x320 mm/slub.c:3544
 acpi_os_release_object+0x1d/0x30 drivers/acpi/osl.c:1702
 acpi_ut_delete_object_desc+0x78/0xd0 drivers/acpi/acpica/utobject.c:402
 acpi_ut_delete_internal_obj drivers/acpi/acpica/utdelete.c:316 [inline]
 acpi_ut_update_ref_count+0xab3/0xbe0 drivers/acpi/acpica/utdelete.c:436
 acpi_ut_update_object_reference+0x537/0x6c0 drivers/acpi/acpica/utdelete.c:632
 acpi_ut_remove_reference+0x83/0xb0 drivers/acpi/acpica/utdelete.c:740
 acpi_rs_get_prt_method_data+0xc9/0x110 drivers/acpi/acpica/rsutils.c:460
 acpi_get_irq_routing_table+0xb4/0xe0 drivers/acpi/acpica/rsxface.c:137
 acpi_pci_irq_find_prt_entry+0x160/0xe70 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0x40/0x580 drivers/acpi/pci_irq.c:298
 acpi_pci_irq_disable+0x190/0x390 drivers/acpi/pci_irq.c:493
 pcibios_disable_device+0xa7/0x100 arch/x86/pci/common.c:698
 do_pci_disable_device drivers/pci/pci.c:2111 [inline]
 pci_disable_device+0x213/0x3f0 drivers/pci/pci.c:2151
 virtio_pci_remove+0xc4/0xe0 drivers/virtio/virtio_pci_common.c:598
 pci_device_remove+0xa6/0x1d0 drivers/pci/pci-driver.c:471
 __device_release_driver drivers/base/dd.c:1227 [inline]
 device_release_driver_internal+0x4e8/0x7c0 drivers/base/dd.c:1262
 device_release_driver+0x19/0x20 drivers/base/dd.c:1285
 pci_stop_dev drivers/pci/remove.c:23 [inline]
 pci_stop_bus_device+0x10c/0x140 drivers/pci/remove.c:83
 pci_stop_and_remove_bus_device drivers/pci/remove.c:117 [inline]
 pci_stop_and_remove_bus_device_locked+0x1a/0x30 drivers/pci/remove.c:125
 remove_store+0xe2/0x140 drivers/pci/pci-sysfs.c:494
 dev_attr_store+0x5e/0x80 drivers/base/core.c:2136
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:143
 kernfs_fop_write_iter+0x2bd/0x400 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2218 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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

The buggy address belongs to the object at ffff8881067dca90
 which belongs to the cache Acpi-Operand of size 72
The buggy address is located 8 bytes inside of
 72-byte region [ffff8881067dca90, ffff8881067dcad8)
The buggy address belongs to the page:
page:ffffea000419f700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881067dc750 pfn:0x1067dc
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004197408 ffff88810006c490 ffff88810004dc80
raw: ffff8881067dc750 0000000000270019 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 1428068062, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2610
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2616
 get_page_from_freelist+0x2d42/0x2dd0 mm/page_alloc.c:4492
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5829
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x138/0x260 mm/slub.c:3260
 kmem_cache_zalloc include/linux/slab.h:740 [inline]
 acpi_os_acquire_object include/acpi/platform/aclinuxex.h:67 [inline]
 acpi_ut_allocate_object_desc_dbg drivers/acpi/acpica/utobject.c:359 [inline]
 acpi_ut_create_internal_object_dbg+0xe9/0x470 drivers/acpi/acpica/utobject.c:69
 acpi_ds_build_internal_object+0x292/0x650 drivers/acpi/acpica/dsobject.c:94
 acpi_ds_create_node+0x96/0x140 drivers/acpi/acpica/dsobject.c:281
 acpi_ds_exec_end_op+0xa44/0x1190 drivers/acpi/acpica/dswexec.c:592
 acpi_ps_parse_loop+0xc49/0x1c50 drivers/acpi/acpica/psloop.c:553
 acpi_ps_parse_aml+0x214/0x9a0 drivers/acpi/acpica/psparse.c:489
 acpi_ps_execute_table+0x332/0x410 drivers/acpi/acpica/psxface.c:295
 acpi_ns_execute_table+0x3ac/0x570 drivers/acpi/acpica/nsparse.c:116
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881067dc980: 00 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8881067dca00: 00 fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc
>ffff8881067dca80: fc fc fa fb fb fb fb fb fb fb fb fc fc fc fc fb
                            ^
 ffff8881067dcb00: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
 ffff8881067dcb80: fb fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb
==================================================================
ACPI Error: Object not a Package, type String (20210730/exresnte-106)
ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_OPERAND_TYPE) (20210730/uteval-69)
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