================================================================== BUG: KASAN: use-after-free in process_notifier+0x343/0x7b0 drivers/misc/uid_sys_stats.c:707 Write of size 8 at addr ffff888109aad3d8 by task kworker/dying/16021 CPU: 0 PID: 16021 Comm: kworker/dying Tainted: G W 6.1.25-syzkaller-00063-g4b3ab91671d8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356 process_notifier+0x343/0x7b0 drivers/misc/uid_sys_stats.c:707 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382 profile_task_exit+0x1e/0x30 kernel/profile.c:146 do_exit+0x2c1/0x2b80 kernel/exit.c:819 kthread_exit+0x46/0x60 kernel/kthread.c:306 kthread+0x28b/0x300 kernel/kthread.c:378 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 16021: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x44/0xa0 mm/slab_common.c:1052 kmalloc include/linux/slab.h:553 [inline] process_notifier+0x2c1/0x7b0 drivers/misc/uid_sys_stats.c:695 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382 profile_task_exit+0x1e/0x30 kernel/profile.c:146 do_exit+0x2c1/0x2b80 kernel/exit.c:819 kthread_exit+0x46/0x60 kernel/kthread.c:306 kthread+0x28b/0x300 kernel/kthread.c:378 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 1102: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1744 [inline] slab_free_freelist_hook mm/slub.c:1770 [inline] slab_free mm/slub.c:3681 [inline] __kmem_cache_free+0x218/0x3b0 mm/slub.c:3694 kfree+0x7a/0xf0 mm/slab_common.c:1009 update_stats_workfn+0x36b/0x3e0 drivers/misc/uid_sys_stats.c:674 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2296 worker_thread+0xa60/0x1260 kernel/workqueue.c:2443 kthread+0x26d/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff888109aad380 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 88 bytes inside of 96-byte region [ffff888109aad380, ffff888109aad3e0) The buggy address belongs to the physical page: page:ffffea000426ab40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109aad flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00045cec00 dead000000000004 ffff888100042900 raw: 0000000000000000 0000000080200020 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, tgid 1 (swapper/0), ts 1343930114, free_ts 1300353335 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2582 prep_new_page+0x1b/0x110 mm/page_alloc.c:2589 get_page_from_freelist+0x2762/0x27f0 mm/page_alloc.c:4387 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5664 allocate_slab mm/slub.c:1959 [inline] new_slab+0xce/0x4c0 mm/slub.c:2012 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3200 __slab_alloc+0x5d/0xa0 mm/slub.c:3299 slab_alloc_node mm/slub.c:3384 [inline] __kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3457 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1047 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_evaluate_object+0x158/0xaf0 drivers/acpi/acpica/nsxfeval.c:177 acpi_evaluate_integer+0x112/0x230 drivers/acpi/utils.c:260 acpi_init_coherency drivers/acpi/scan.c:1655 [inline] acpi_init_device_object+0x29ff/0x34f0 drivers/acpi/scan.c:1782 acpi_add_single_object+0x105/0x1be0 drivers/acpi/scan.c:1822 acpi_bus_check_add+0x404/0x970 drivers/acpi/scan.c:2082 acpi_bus_check_add_1+0x22/0x30 drivers/acpi/scan.c:2098 acpi_ns_walk_namespace+0x249/0x4a0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1494 [inline] free_pcp_prepare mm/page_alloc.c:1568 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3486 free_unref_page+0x8d/0x480 mm/page_alloc.c:3582 free_the_page mm/page_alloc.c:794 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5753 __free_slab+0xce/0x1a0 mm/slub.c:2036 free_slab mm/slub.c:2051 [inline] discard_slab mm/slub.c:2057 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2606 put_cpu_partial+0xa9/0x100 mm/slub.c:2682 __slab_free+0x1c8/0x280 mm/slub.c:3558 do_slab_free mm/slub.c:3635 [inline] ___cache_free+0xc6/0xd0 mm/slub.c:3688 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:168 qlist_free_all mm/kasan/quarantine.c:187 [inline] __per_cpu_remove_cache mm/kasan/quarantine.c:329 [inline] per_cpu_remove_cache+0x17c/0x1d0 mm/kasan/quarantine.c:357 __flush_smp_call_function_queue+0x222/0x6a0 kernel/smp.c:630 generic_smp_call_function_single_interrupt+0x13/0x20 kernel/smp.c:546 __sysvec_call_function_single+0x63/0x1b0 arch/x86/kernel/smp.c:267 sysvec_call_function_single+0x92/0xb0 arch/x86/kernel/smp.c:262 asm_sysvec_call_function_single+0x1b/0x20 arch/x86/include/asm/idtentry.h:657 Memory state around the buggy address: ffff888109aad280: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff888109aad300: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff888109aad380: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888109aad400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888109aad480: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================