netlink: 4 bytes leftover after parsing attributes in process `syz.1.1670'. ================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff868099c0 of 8 bytes by interrupt on cpu 0: tick_do_update_jiffies64+0x113/0x1c0 kernel/time/tick-sched.c:118 tick_sched_do_timer kernel/time/tick-sched.c:232 [inline] tick_nohz_handler+0x7f/0x2d0 kernel/time/tick-sched.c:290 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x20f/0x5a0 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1d0 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 __ref_is_percpu include/linux/percpu-refcount.h:174 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:332 [inline] percpu_ref_put include/linux/percpu-refcount.h:351 [inline] css_put include/linux/cgroup_refcnt.h:79 [inline] mem_cgroup_iter+0x2dc/0x340 mm/memcontrol.c:1084 shrink_node_memcgs mm/vmscan.c:6070 [inline] shrink_node+0x7e2/0x2120 mm/vmscan.c:6095 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2356 try_charge mm/memcontrol.c:2498 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4701 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4787 __read_swap_cache_async+0x17b/0x2d0 mm/swap_state.c:481 swap_cluster_readahead+0x262/0x3c0 mm/swap_state.c:650 swapin_readahead+0xde/0x6f0 mm/swap_state.c:813 do_swap_page+0x2ae/0x2370 mm/memory.c:4713 handle_pte_fault mm/memory.c:6180 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x9a5/0x2be0 mm/memory.c:6487 do_user_addr_fault+0x630/0x1080 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 read to 0xffffffff868099c0 of 8 bytes by task 7916 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:635 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x63/0x680 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x448/0x760 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6056 [inline] shrink_node+0x6c3/0x2120 mm/vmscan.c:6095 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2356 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2799 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2843 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5200 __alloc_pages_noprof+0x9/0x20 mm/page_alloc.c:5217 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] vm_area_alloc_pages mm/vmalloc.c:3649 [inline] __vmalloc_area_node mm/vmalloc.c:3724 [inline] __vmalloc_node_range_noprof+0x6eb/0xed0 mm/vmalloc.c:3897 __bpf_map_area_alloc kernel/bpf/syscall.c:401 [inline] bpf_map_area_alloc+0xfa/0x150 kernel/bpf/syscall.c:408 array_map_alloc+0x1d3/0x3c0 kernel/bpf/arraymap.c:142 map_create+0x840/0xda0 kernel/bpf/syscall.c:1512 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6131 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline] __se_sys_bpf kernel/bpf/syscall.c:6257 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6257 x64_sys_call+0x2aee/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000ffffb0f1 -> 0x00000000ffffb0f2 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 7916 Comm: syz.1.1670 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ==================================================================