================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86c09a00 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:1785 [inline] __hrtimer_run_queues+0x218/0x4f0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x269/0x810 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1f0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 __tsan_read4+0x0/0x190 kernel/kcsan/core.c:753 memcg_kmem_id include/linux/memcontrol.h:1741 [inline] list_lru_count_one+0x2d/0x100 mm/list_lru.c:259 list_lru_shrink_count include/linux/list_lru.h:190 [inline] super_cache_count+0x111/0x160 fs/super.c:266 do_shrink_slab+0x63/0x6a0 mm/shrinker.c:384 shrink_slab+0x1f4/0x880 mm/shrinker.c:664 shrink_one+0x193/0x3f0 mm/vmscan.c:4928 shrink_many mm/vmscan.c:4989 [inline] lru_gen_shrink_node mm/vmscan.c:5067 [inline] shrink_node+0x19a6/0x2130 mm/vmscan.c:6047 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x408/0xc80 mm/vmscan.c:6362 try_to_free_pages+0x362/0x880 mm/vmscan.c:6601 __perform_reclaim mm/page_alloc.c:4424 [inline] __alloc_pages_direct_reclaim+0x4e/0xd0 mm/page_alloc.c:4446 __alloc_pages_slowpath+0x2a4/0x600 mm/page_alloc.c:4846 __alloc_frozen_pages_noprof+0x270/0x360 mm/page_alloc.c:5263 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof mm/mempolicy.c:2581 [inline] folio_alloc_noprof+0x96/0x150 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x92/0x220 mm/filemap.c:1013 __filemap_get_folio_mpol+0x295/0x680 mm/filemap.c:2011 __filemap_get_folio include/linux/pagemap.h:763 [inline] filemap_fault+0x486/0xb90 mm/filemap.c:3564 __do_fault+0xbc/0x200 mm/memory.c:5364 do_read_fault mm/memory.c:5799 [inline] do_fault mm/memory.c:5933 [inline] do_pte_missing mm/memory.c:4477 [inline] handle_pte_fault mm/memory.c:6317 [inline] __handle_mm_fault mm/memory.c:6455 [inline] handle_mm_fault+0x11e2/0x3020 mm/memory.c:6624 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 read to 0xffffffff86c09a00 of 8 bytes by task 3183 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:638 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x63/0x6a0 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x538/0x880 mm/shrinker.c:628 shrink_one+0x193/0x3f0 mm/vmscan.c:4928 shrink_many mm/vmscan.c:4989 [inline] lru_gen_shrink_node mm/vmscan.c:5067 [inline] shrink_node+0x19a6/0x2130 mm/vmscan.c:6047 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x408/0xc80 mm/vmscan.c:6362 try_to_free_pages+0x362/0x880 mm/vmscan.c:6601 __perform_reclaim mm/page_alloc.c:4424 [inline] __alloc_pages_direct_reclaim+0x4e/0xd0 mm/page_alloc.c:4446 __alloc_pages_slowpath+0x2a4/0x600 mm/page_alloc.c:4846 __alloc_frozen_pages_noprof+0x270/0x360 mm/page_alloc.c:5263 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof mm/mempolicy.c:2581 [inline] folio_alloc_noprof+0x96/0x150 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x92/0x220 mm/filemap.c:1013 __filemap_get_folio_mpol+0x295/0x680 mm/filemap.c:2011 __filemap_get_folio include/linux/pagemap.h:763 [inline] filemap_fault+0x486/0xb90 mm/filemap.c:3564 __do_fault+0xbc/0x200 mm/memory.c:5364 do_read_fault mm/memory.c:5799 [inline] do_fault mm/memory.c:5933 [inline] do_pte_missing mm/memory.c:4477 [inline] handle_pte_fault mm/memory.c:6317 [inline] __handle_mm_fault mm/memory.c:6455 [inline] handle_mm_fault+0x11e2/0x3020 mm/memory.c:6624 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: 0x000000010000309b -> 0x000000010000309c Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 101 PID: 3183 Comm: dhcpcd Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================