================================================================== 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+0x32/0x80 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 find_watchpoint kernel/kcsan/core.c:120 [inline] check_access kernel/kcsan/core.c:737 [inline] __tsan_read1+0x1d/0x180 kernel/kcsan/core.c:1022 __skb_ext_copy include/linux/skbuff.h:4953 [inline] __copy_skb_header+0x139/0x2f0 net/core/skbuff.c:1497 __skb_clone+0x44/0x2d0 net/core/skbuff.c:1547 skb_clone+0x182/0x1f0 net/core/skbuff.c:2057 __tcp_transmit_skb+0x1d8/0x1c10 net/ipv4/tcp_output.c:1474 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_write_xmit+0x129c/0x30f0 net/ipv4/tcp_output.c:2999 tcp_tsq_write+0x15c/0x170 net/ipv4/tcp_output.c:1241 tcp_tsq_handler net/ipv4/tcp_output.c:1250 [inline] tcp_tsq_workfn+0x23b/0x300 net/ipv4/tcp_output.c:1282 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346 bh_worker+0x229/0x370 kernel/workqueue.c:3607 workqueue_softirq_action+0xab/0xc0 kernel/workqueue.c:3635 tasklet_action+0xb/0x30 kernel/softirq.c:952 handle_softirqs+0xba/0x290 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:723 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:318 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688 finish_task_switch+0xb6/0x2b0 kernel/sched/core.c:5193 context_switch kernel/sched/core.c:5328 [inline] __schedule+0x6b9/0xb30 kernel/sched/core.c:6929 preempt_schedule_common kernel/sched/core.c:7113 [inline] __cond_resched+0x4e/0x90 kernel/sched/core.c:7458 might_resched include/linux/kernel.h:61 [inline] might_alloc include/linux/sched/mm.h:321 [inline] slab_pre_alloc_hook mm/slub.c:4929 [inline] slab_alloc_node mm/slub.c:5264 [inline] kmem_cache_alloc_noprof+0x46/0x480 mm/slub.c:5295 getname_flags+0x80/0x3b0 fs/namei.c:146 getname include/linux/fs.h:2924 [inline] getname_maybe_null include/linux/fs.h:2931 [inline] vfs_fstatat+0x43/0x170 fs/stat.c:370 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat+0x55/0x260 fs/stat.c:536 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:536 x64_sys_call+0x135a/0x3000 arch/x86/include/generated/asm/syscalls_64.h:263 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 read to 0xffffffff868099c0 of 8 bytes by task 22914 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 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/0x800 mm/swap_state.c:826 do_swap_page+0x2ae/0x2370 mm/memory.c:4714 handle_pte_fault mm/memory.c:6198 [inline] __handle_mm_fault mm/memory.c:6336 [inline] handle_mm_fault+0x9a5/0x2be0 mm/memory.c:6505 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 value changed: 0x000000010000162d -> 0x000000010000162e Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 22914 Comm: syz.4.6517 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ==================================================================