================================================================== 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 __sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:233 page_vma_mapped_walk+0xcbf/0xd20 mm/page_vma_mapped.c:301 try_to_unmap_one+0x34e/0x2070 mm/rmap.c:2012 rmap_walk_anon+0x280/0x430 mm/rmap.c:2973 rmap_walk mm/rmap.c:3078 [inline] try_to_unmap+0x172/0x210 mm/rmap.c:2384 shrink_folio_list+0x12f7/0x2820 mm/vmscan.c:1375 evict_folios+0x2a60/0x35c0 mm/vmscan.c:4718 try_to_shrink_lruvec+0x81b/0xbf0 mm/vmscan.c:4881 lru_gen_shrink_lruvec mm/vmscan.c:5030 [inline] shrink_lruvec+0x255/0x1c60 mm/vmscan.c:5784 shrink_node_memcgs mm/vmscan.c:6020 [inline] shrink_node+0x67a/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 try_charge mm/memcontrol.c:2556 [inline] charge_memcg mm/memcontrol.c:4744 [inline] __mem_cgroup_charge+0x65/0x150 mm/memcontrol.c:4761 mem_cgroup_charge include/linux/memcontrol.h:664 [inline] folio_prealloc mm/memory.c:1211 [inline] wp_page_copy mm/memory.c:3780 [inline] do_wp_page+0xf84/0x2590 mm/memory.c:4241 handle_pte_fault mm/memory.c:6333 [inline] __handle_mm_fault mm/memory.c:6455 [inline] handle_mm_fault+0x8c7/0x3020 mm/memory.c:6624 do_user_addr_fault+0x3fd/0x1050 arch/x86/mm/fault.c:1385 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 rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:68 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] _copy_to_iter+0x141/0xea0 lib/iov_iter.c:197 copy_page_to_iter+0x18f/0x2d0 lib/iov_iter.c:374 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x407/0xa10 mm/filemap.c:2856 generic_file_read_iter+0x79/0x330 mm/filemap.c:2997 ext4_file_read_iter+0x1cc/0x290 fs/ext4/file.c:-1 do_iter_readv_writev+0x4fd/0x5a0 fs/read_write.c:-1 vfs_readv+0x1f4/0x6e0 fs/read_write.c:1020 do_preadv fs/read_write.c:1134 [inline] __do_sys_preadv fs/read_write.c:1181 [inline] __se_sys_preadv fs/read_write.c:1176 [inline] __x64_sys_preadv+0xfd/0x1c0 fs/read_write.c:1176 x64_sys_call+0x2915/0x3020 arch/x86/include/generated/asm/syscalls_64.h:296 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 8565 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 array_map_alloc+0x1d3/0x3c0 kernel/bpf/arraymap.c:142 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: 0x00000000ffffd7ad -> 0x00000000ffffd7ae Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 8565 Comm: syz.4.1460 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ==================================================================