RBP: 00007fd6aab97090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fd6a9fc6038 R14: 00007fd6a9fc5fa0 R15: 00007ffce9689e88 ================================================================== BUG: KASAN: slab-use-after-free in gpiolib_seq_stop+0xc6/0xe0 drivers/gpio/gpiolib.c:5306 Read of size 4 at addr ffff888140b68704 by task syz.4.1533/13598 CPU: 0 UID: 0 PID: 13598 Comm: syz.4.1533 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 gpiolib_seq_stop+0xc6/0xe0 drivers/gpio/gpiolib.c:5306 traverse.part.0.constprop.0+0x2c0/0x640 fs/seq_file.c:131 traverse fs/seq_file.c:98 [inline] seq_read_iter+0x932/0x12c0 fs/seq_file.c:195 seq_read+0x3a3/0x570 fs/seq_file.c:162 full_proxy_read+0x12e/0x1a0 fs/debugfs/file.c:378 vfs_read+0x1e1/0xcf0 fs/read_write.c:570 ksys_pread64 fs/read_write.c:763 [inline] __do_sys_pread64 fs/read_write.c:771 [inline] __se_sys_pread64 fs/read_write.c:768 [inline] __x64_sys_pread64+0x1eb/0x250 fs/read_write.c:768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd6a9d8ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd6aab97038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007fd6a9fc5fa0 RCX: 00007fd6a9d8ebe9 RDX: 0000000000007fff RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fd6aab97090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fd6a9fc6038 R14: 00007fd6a9fc5fa0 R15: 00007ffce9689e88 Allocated by task 13598: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] gpiolib_seq_start+0x69/0x270 drivers/gpio/gpiolib.c:5271 seq_read_iter+0x2c1/0x12c0 fs/seq_file.c:225 seq_read+0x3a3/0x570 fs/seq_file.c:162 full_proxy_read+0x12e/0x1a0 fs/debugfs/file.c:378 vfs_read+0x1e1/0xcf0 fs/read_write.c:570 ksys_pread64 fs/read_write.c:763 [inline] __do_sys_pread64 fs/read_write.c:771 [inline] __se_sys_pread64 fs/read_write.c:768 [inline] __x64_sys_pread64+0x1eb/0x250 fs/read_write.c:768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13598: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x60/0x70 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4879 seq_read_iter+0x60d/0x12c0 fs/seq_file.c:251 seq_read+0x3a3/0x570 fs/seq_file.c:162 full_proxy_read+0x12e/0x1a0 fs/debugfs/file.c:378 vfs_read+0x1e1/0xcf0 fs/read_write.c:570 ksys_pread64 fs/read_write.c:763 [inline] __do_sys_pread64 fs/read_write.c:771 [inline] __se_sys_pread64 fs/read_write.c:768 [inline] __x64_sys_pread64+0x1eb/0x250 fs/read_write.c:768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888140b68700 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 4 bytes inside of freed 8-byte region [ffff888140b68700, ffff888140b68708) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x140b68 flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000000 ffff88801b841500 ffffea000511d840 dead000000000002 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 13056860482, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab mm/slub.c:2655 [inline] new_slab+0x247/0x330 mm/slub.c:2709 ___slab_alloc+0xcf2/0x1740 mm/slub.c:3891 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981 __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] acpi_ex_allocate_name_string+0x6f/0x2e0 drivers/acpi/acpica/exnames.c:66 acpi_ex_get_name_string+0x131/0x5d0 drivers/acpi/acpica/exnames.c:367 acpi_ds_create_operand+0x37d/0x880 drivers/acpi/acpica/dsutils.c:446 acpi_ds_evaluate_name_path+0x138/0x470 drivers/acpi/acpica/dsutils.c:778 acpi_ds_exec_end_op+0x3b0/0x1460 drivers/acpi/acpica/dswexec.c:374 acpi_ps_parse_loop+0x425/0x1d00 drivers/acpi/acpica/psloop.c:525 acpi_ps_parse_aml+0x3c1/0xcb0 drivers/acpi/acpica/psparse.c:475 acpi_ps_execute_method+0x55a/0xb30 drivers/acpi/acpica/psxface.c:190 page_owner free stack trace missing Memory state around the buggy address: ffff888140b68600: 06 fc fc fc 06 fc fc fc 06 fc fc fc 04 fc fc fc ffff888140b68680: fa fc fc fc 00 fc fc fc fa fc fc fc fa fc fc fc >ffff888140b68700: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ^ ffff888140b68780: fa fc fc fc 04 fc fc fc 04 fc fc fc 04 fc fc fc ffff888140b68800: 05 fc fc fc 07 fc fc fc 07 fc fc fc 07 fc fc fc ==================================================================