================================================================== 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 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 page_pool_dma_sync_for_device net/core/page_pool.c:465 [inline] __page_pool_put_page net/core/page_pool.c:844 [inline] page_pool_put_unrefed_netmem+0x13f/0x4b0 net/core/page_pool.c:905 page_pool_put_netmem include/net/page_pool/helpers.h:343 [inline] page_pool_put_full_netmem include/net/page_pool/helpers.h:373 [inline] napi_pp_put_page+0xe9/0x200 net/core/skbuff.c:1039 skb_pp_recycle net/core/skbuff.c:1050 [inline] skb_free_head net/core/skbuff.c:1097 [inline] skb_release_data+0x624/0x670 net/core/skbuff.c:1128 skb_release_all net/core/skbuff.c:1203 [inline] __kfree_skb+0x44/0x150 net/core/skbuff.c:1217 sk_skb_reason_drop+0xbd/0x290 net/core/skbuff.c:1255 llc_rcv+0x4e7/0x790 net/llc/llc_input.c:-1 __netif_receive_skb_list_ptype net/core/dev.c:6212 [inline] __netif_receive_skb_list_core+0x483/0x500 net/core/dev.c:6254 __netif_receive_skb_list net/core/dev.c:6306 [inline] netif_receive_skb_list_internal+0x47d/0x5f0 net/core/dev.c:6397 netif_receive_skb_list+0x35/0x220 net/core/dev.c:6449 xdp_recv_frames net/bpf/test_run.c:269 [inline] xdp_test_run_batch net/bpf/test_run.c:350 [inline] bpf_test_run_xdp_live+0x104c/0x1360 net/bpf/test_run.c:379 bpf_prog_test_run_xdp+0x57b/0xa10 net/bpf/test_run.c:1397 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 4881 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_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 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] filemap_add_folio+0x110/0x350 mm/filemap.c:959 page_cache_ra_unbounded+0x20e/0x450 mm/readahead.c:282 do_page_cache_ra mm/readahead.c:334 [inline] page_cache_ra_order+0x153/0x250 mm/readahead.c:538 do_sync_mmap_readahead+0x33d/0x350 mm/filemap.c:3400 filemap_fault+0x362/0xb90 mm/filemap.c:3549 __do_fault+0xbc/0x200 mm/memory.c:5363 do_read_fault mm/memory.c:5798 [inline] do_fault mm/memory.c:5932 [inline] do_pte_missing mm/memory.c:4477 [inline] handle_pte_fault mm/memory.c:6316 [inline] __handle_mm_fault mm/memory.c:6454 [inline] handle_mm_fault+0x11d7/0x3020 mm/memory.c:6623 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1023/0x1ea0 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:3899 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0x267/0x310 mm/mmap.c:605 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 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: 0x00000000ffffbef3 -> 0x00000000ffffbef4 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4881 Comm: syz.2.374 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== syz.2.374 invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 4881 Comm: syz.2.374 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x80/0x240 mm/oom_kill.c:467 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1695 [inline] mem_cgroup_oom mm/memcontrol.c:1718 [inline] try_charge_memcg+0x62e/0xa10 mm/memcontrol.c:2456 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] filemap_add_folio+0x110/0x350 mm/filemap.c:959 __filemap_get_folio_mpol+0x326/0x680 mm/filemap.c:2016 __filemap_get_folio include/linux/pagemap.h:774 [inline] filemap_fault+0x486/0xb90 mm/filemap.c:3559 __do_fault+0xbc/0x200 mm/memory.c:5363 do_read_fault mm/memory.c:5798 [inline] do_fault mm/memory.c:5932 [inline] do_pte_missing mm/memory.c:4477 [inline] handle_pte_fault mm/memory.c:6316 [inline] __handle_mm_fault mm/memory.c:6454 [inline] handle_mm_fault+0x11d7/0x3020 mm/memory.c:6623 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1023/0x1ea0 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:3899 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0x267/0x310 mm/mmap.c:605 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 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 RIP: 0033:0x7fa19505c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa193329028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fa1952d6270 RCX: 00007fa19505c799 RDX: 0000000001000003 RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007fa1950f2bd9 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa1952d6308 R14: 00007fa1952d6270 R15: 00007ffccc264dd8 memory: usage 222576kB, limit 307200kB, failcnt 5445 memory+swap: usage 223700kB, limit 9007199254740988kB, failcnt 0 kmem: usage 178992kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz2: cache 1413120 rss 110592 shmem 0 mapped_file 3686400 dirty 405504 writeback 0 workingset_refault_anon 365 workingset_refault_file 3439 swap 1150976 swapcached 4505600 pgpgin 66007 pgpgout 65634 pgfault 80351 pgmajfault 274 inactive_anon 24576 active_anon 90112 inactive_file 0 active_file 1413120 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 1413120 total_rss 110592 total_shmem 0 total_mapped_file 3686400 total_dirty 405504 total_writeback 0 total_workingset_refault_anon 365 total_workingset_refault_file 3439 total_swap 1150976 total_swapcached 4505600 total_pgpgin 66007 total_pgpgout 65634 total_pgfault 80351 total_pgmajfault 274 total_inactive_anon 24576 total_active_anon 90112 total_inactive_file 0 total_active_file 1413120 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz2,task_memcg=/syz2,task=syz.2.374,pid=4870,uid=0 Memory cgroup out of memory: Killed process 4870 (syz.2.374) total-vm:108016kB, anon-rss:1364kB, file-rss:35252kB, shmem-rss:0kB, UID:0 pgtables:148kB oom_score_adj:1000