================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86a09a00 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+0x207/0x4c0 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/0x1d0 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 constant_test_bit arch/x86/include/asm/bitops.h:202 [inline] arch_test_bit arch/x86/include/asm/bitops.h:232 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] folio_test_swapbacked include/linux/page-flags.h:578 [inline] folio_test_swapcache include/linux/page-flags.h:633 [inline] free_swap_cache mm/swap_state.c:316 [inline] free_pages_and_swap_cache+0x118/0x450 mm/swap_state.c:347 __tlb_batch_free_encoded_pages mm/mmu_gather.c:137 [inline] tlb_batch_pages_flush mm/mmu_gather.c:150 [inline] tlb_flush_mmu_free mm/mmu_gather.c:398 [inline] tlb_flush_mmu+0x557/0x6d0 mm/mmu_gather.c:405 zap_pte_range mm/memory.c:1897 [inline] zap_pmd_range mm/memory.c:1950 [inline] zap_pud_range mm/memory.c:1978 [inline] zap_p4d_range mm/memory.c:1999 [inline] unmap_page_range+0x249c/0x2760 mm/memory.c:2020 unmap_single_vma mm/memory.c:2062 [inline] unmap_vmas+0x27a/0x3f0 mm/memory.c:2104 exit_mmap+0x19e/0x6c0 mm/mmap.c:1277 __mmput+0x28/0x1c0 kernel/fork.c:1174 mmput+0x40/0x50 kernel/fork.c:1197 exit_mm+0xe3/0x180 kernel/exit.c:581 do_exit+0x3fa/0x1590 kernel/exit.c:959 do_group_exit+0x138/0x140 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1121 x64_sys_call+0x3008/0x3020 arch/x86/include/generated/asm/syscalls_64.h:232 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 0xffffffff86a09a00 of 8 bytes by task 14409 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+0x63/0x670 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+0x6cb/0x2000 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x404/0xcc0 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x222/0x470 mm/vmscan.c:6690 try_charge_memcg+0x37e/0xa10 mm/memcontrol.c:2419 try_charge mm/memcontrol.c:2561 [inline] charge_memcg mm/memcontrol.c:4776 [inline] __mem_cgroup_charge+0x65/0x150 mm/memcontrol.c:4793 mem_cgroup_charge include/linux/memcontrol.h:663 [inline] shmem_alloc_and_add_folio mm/shmem.c:1971 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2585 shmem_get_folio mm/shmem.c:2691 [inline] shmem_write_begin+0xfc/0x1f0 mm/shmem.c:3344 generic_perform_write+0x183/0x490 mm/filemap.c:4314 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3519 __kernel_write_iter+0x319/0x590 fs/read_write.c:621 dump_emit_page fs/coredump.c:1299 [inline] dump_user_range+0xa7d/0xdb0 fs/coredump.c:1373 elf_core_dump+0x21a2/0x2330 fs/binfmt_elf.c:2111 coredump_write+0xacf/0xdf0 fs/coredump.c:1050 do_coredump fs/coredump.c:1127 [inline] vfs_coredump+0x26c7/0x3130 fs/coredump.c:1201 get_signal+0xd7b/0xf60 kernel/signal.c:3019 arch_do_signal_or_restart+0x96/0x450 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0xf7/0x520 kernel/entry/common.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x00000000fffffc79 -> 0x00000000fffffc7a Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 14409 Comm: syz.1.3203 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ==================================================================