================================================================== 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 1: 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 should_watch kernel/kcsan/core.c:280 [inline] check_access kernel/kcsan/core.c:752 [inline] __tsan_unaligned_write8+0x14c/0x180 kernel/kcsan/core.c:1025 bpf_test_run+0x1d9/0x620 net/bpf/test_run.c:416 bpf_prog_test_run_skb+0x9a4/0xef0 net/bpf/test_run.c:1159 bpf_prog_test_run+0x204/0x340 kernel/bpf/syscall.c:4722 __sys_bpf+0x52e/0x7e0 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6339 x64_sys_call+0x10cb/0x3020 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c09a00 of 8 bytes by task 9958 on cpu 0: 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_node_memcgs mm/vmscan.c:6022 [inline] shrink_node+0x6bc/0x2130 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x408/0xc80 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x1f5/0x470 mm/vmscan.c:6683 try_charge_memcg+0x37e/0xa10 mm/memcontrol.c:2414 obj_cgroup_charge_pages+0x23/0xc0 mm/memcontrol.c:2857 __memcg_kmem_charge_page+0x9e/0x170 mm/memcontrol.c:2901 __alloc_frozen_pages_noprof+0x18a/0x360 mm/page_alloc.c:5267 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2484 alloc_frozen_pages_noprof mm/mempolicy.c:2555 [inline] alloc_pages_noprof+0x8f/0x130 mm/mempolicy.c:2575 vm_area_alloc_pages mm/vmalloc.c:3731 [inline] __vmalloc_area_node mm/vmalloc.c:3876 [inline] __vmalloc_node_range_noprof+0xa46/0x12b0 mm/vmalloc.c:4064 __bpf_map_area_alloc kernel/bpf/syscall.c:404 [inline] bpf_map_area_alloc+0xfa/0x140 kernel/bpf/syscall.c:411 prealloc_init+0xcb/0x490 kernel/bpf/hashtab.c:317 htab_map_alloc+0x49d/0x6b0 kernel/bpf/hashtab.c:554 map_create+0x862/0xda0 kernel/bpf/syscall.c:1507 __sys_bpf+0x5c8/0x7e0 kernel/bpf/syscall.c:6210 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6339 x64_sys_call+0x10cb/0x3020 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffff33d -> 0x00000000fffff33e Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 9958 Comm: syz.1.1775 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================