================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86809a00 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: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: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 __rcu_read_unlock+0x37/0x70 kernel/rcu/tree_plugin.h:435 rcu_read_unlock include/linux/rcupdate.h:899 [inline] percpu_ref_get_many include/linux/percpu-refcount.h:209 [inline] percpu_ref_get include/linux/percpu-refcount.h:222 [inline] obj_cgroup_get include/linux/memcontrol.h:781 [inline] __memcg_kmem_charge_page+0xc4/0x170 mm/memcontrol.c:2869 __alloc_frozen_pages_noprof+0x18f/0x360 mm/page_alloc.c:5227 __alloc_pages_noprof+0x9/0x20 mm/page_alloc.c:5244 __alloc_pages_node_noprof include/linux/gfp.h:285 [inline] alloc_pages_node_noprof include/linux/gfp.h:312 [inline] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:127 [inline] bpf_ringbuf_alloc+0x1ef/0x400 kernel/bpf/ringbuf.c:175 ringbuf_map_alloc+0x1ca/0x230 kernel/bpf/ringbuf.c:218 map_create+0x862/0xda0 kernel/bpf/syscall.c:1514 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6146 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6272 x64_sys_call+0x28e1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86809a00 of 8 bytes by task 25411 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:636 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+0x4f5/0x840 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6022 [inline] shrink_node+0x6a9/0x2010 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6690 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2388 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2823 obj_cgroup_charge_account+0x73/0x1a0 mm/memcontrol.c:3126 __memcg_slab_post_alloc_hook+0x397/0x530 mm/memcontrol.c:3212 memcg_slab_post_alloc_hook mm/slub.c:2338 [inline] slab_post_alloc_hook mm/slub.c:4964 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x2c5/0x4b0 mm/slub.c:5270 alloc_buffer_head+0x35/0x1f0 fs/buffer.c:3025 folio_alloc_buffers+0x14a/0x310 fs/buffer.c:935 create_empty_buffers+0x2c/0x200 fs/buffer.c:1691 folio_create_buffers fs/buffer.c:1802 [inline] __block_write_begin_int+0x1d4/0xf90 fs/buffer.c:2126 block_page_mkwrite+0x1a8/0x3d0 fs/buffer.c:2639 ext4_page_mkwrite+0x859/0xb90 fs/ext4/inode.c:6689 do_page_mkwrite mm/memory.c:3528 [inline] do_shared_fault mm/memory.c:5831 [inline] do_fault mm/memory.c:5893 [inline] do_pte_missing mm/memory.c:4401 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x1601/0x2c60 mm/memory.c:6580 do_user_addr_fault+0x3fe/0x1080 arch/x86/mm/fault.c:1387 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: 0x000000010000413b -> 0x000000010000413c Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 25411 Comm: syz.4.6833 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ==================================================================