================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86c07a00 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:253 [inline] tick_nohz_handler+0x8d/0x3d0 kernel/time/tick-sched.c:312 __run_hrtimer kernel/time/hrtimer.c:1930 [inline] __hrtimer_run_queues+0x276/0x4f0 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x261/0x850 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x32/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 ether_addr_equal_64bits include/linux/etherdevice.h:-1 [inline] eth_skb_pkt_type include/linux/etherdevice.h:628 [inline] eth_type_trans+0x17b/0x460 net/ethernet/eth.c:165 __dev_forward_skb2+0x1cd/0x3c0 net/core/dev.c:2443 __dev_forward_skb+0x22/0x30 net/core/dev.c:2452 veth_forward_skb drivers/net/veth.c:323 [inline] veth_xmit+0x234/0x710 drivers/net/veth.c:379 __netdev_start_xmit include/linux/netdevice.h:5368 [inline] netdev_start_xmit include/linux/netdevice.h:5377 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x12a/0x3a0 net/core/dev.c:3904 __dev_queue_xmit+0xbd5/0x1ec0 net/core/dev.c:4870 dev_queue_xmit include/linux/netdevice.h:3418 [inline] neigh_hh_output include/net/neighbour.h:544 [inline] neigh_output include/net/neighbour.h:558 [inline] ip6_finish_output2+0x861/0xd70 net/ipv6/ip6_output.c:136 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x1e1/0x410 net/ipv6/ip6_output.c:219 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x10a/0x280 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0x52a/0x790 net/ipv6/ndisc.c:512 ndisc_send_rs+0x2e7/0x360 net/ipv6/ndisc.c:723 addrconf_rs_timer+0x1e5/0x310 net/ipv6/addrconf.c:4049 call_timer_fn+0x3b/0x240 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x415/0x5f0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0x31/0x70 kernel/time/timer.c:2405 handle_softirqs+0xb9/0x280 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x42/0xd0 kernel/softirq.c:735 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 preempt_schedule_irq+0x28/0x50 kernel/sched/core.c:7513 raw_irqentry_exit_cond_resched+0x4b/0x60 kernel/entry/common.c:142 irqentry_exit_to_kernel_mode_preempt+0x2b/0x40 include/linux/irq-entry-common.h:468 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x7d/0x5d0 kernel/entry/common.c:164 sysvec_apic_timer_interrupt+0x44/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 is_atomic kernel/kcsan/core.c:249 [inline] should_watch kernel/kcsan/core.c:277 [inline] check_access kernel/kcsan/core.c:752 [inline] __tsan_read4+0xe8/0x190 kernel/kcsan/core.c:1024 perf_sigtrap kernel/events/core.c:7594 [inline] perf_pending_task+0x159/0x210 kernel/events/core.c:7697 task_work_run+0x130/0x1a0 kernel/task_work.c:233 resume_user_mode_work+0x73/0x90 include/linux/resume_user_mode.h:50 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x156/0x5d0 kernel/entry/common.c:162 sysvec_apic_timer_interrupt+0x44/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 read to 0xffffffff86c07a00 of 8 bytes by task 4267 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:743 count_shadow_nodes+0x6a/0x250 mm/workingset.c:692 do_shrink_slab+0x63/0x660 mm/shrinker.c:382 shrink_slab_memcg mm/shrinker.c:553 [inline] shrink_slab+0x545/0x8f0 mm/shrinker.c:631 shrink_node_memcgs mm/vmscan.c:6173 [inline] shrink_node+0x6d4/0x20a0 mm/vmscan.c:6215 shrink_zones mm/vmscan.c:6454 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6516 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6838 try_charge_memcg+0x373/0xa10 mm/memcontrol.c:2627 charge_memcg+0x6d/0x120 mm/memcontrol.c:5015 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:5101 __swap_cache_prepare_and_add+0x69/0x4a0 mm/swap_state.c:476 swap_cache_alloc_folio+0xa2/0x120 mm/swap_state.c:552 swap_cluster_readahead+0x25f/0x3c0 mm/swap_state.c:726 swapin_readahead+0xde/0x840 mm/swap_state.c:901 do_swap_page+0x31e/0x2180 mm/memory.c:4891 handle_pte_fault mm/memory.c:6430 [inline] __handle_mm_fault mm/memory.c:6565 [inline] handle_mm_fault+0xb30/0x2e70 mm/memory.c:6734 do_user_addr_fault+0x62f/0x1050 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x00000000ffff9e47 -> 0x00000000ffff9e48 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4267 Comm: syz.0.312 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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