================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86c07a00 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+0x88/0x380 kernel/time/tick-sched.c:310 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x1f8/0x510 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x257/0x810 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 shrink_lruvec+0x19fe/0x1b60 mm/vmscan.c:5995 shrink_node_memcgs mm/vmscan.c:6127 [inline] shrink_node+0x69d/0x20f0 mm/vmscan.c:6171 shrink_zones mm/vmscan.c:6410 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655 charge_memcg+0x6d/0x120 mm/memcontrol.c:5126 mem_cgroup_swapin_charge_folio+0xc2/0x150 mm/memcontrol.c:5210 __swap_cache_alloc mm/swap_state.c:456 [inline] swap_cache_alloc_folio+0x47b/0x5e0 mm/swap_state.c:524 swap_cache_read_folio mm/swap_state.c:646 [inline] swap_cluster_readahead+0x3d2/0x460 mm/swap_state.c:842 swapin_readahead+0xd8/0x8a0 mm/swap_state.c:984 do_swap_page+0x2a2/0x1ec0 mm/memory.c:4836 handle_pte_fault mm/memory.c:6382 [inline] __handle_mm_fault mm/memory.c:6517 [inline] handle_mm_fault+0xb3c/0x2da0 mm/memory.c:6686 do_user_addr_fault+0x634/0x1060 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 read to 0xffffffff86c07a00 of 8 bytes by task 15197 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:743 count_shadow_nodes+0x6a/0x250 mm/workingset.c:694 do_shrink_slab+0x61/0x650 mm/shrinker.c:389 shrink_slab_memcg mm/shrinker.c:560 [inline] shrink_slab+0x53b/0x8e0 mm/shrinker.c:638 shrink_node_memcgs mm/vmscan.c:6129 [inline] shrink_node+0x6d9/0x20f0 mm/vmscan.c:6171 shrink_zones mm/vmscan.c:6410 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321 alloc_pages_mpol+0xa9/0x1d0 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3742 [inline] __vmalloc_area_node mm/vmalloc.c:3892 [inline] __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000100007793 -> 0x0000000100007794 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15197 Comm: syz.5.3136 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 ================================================================== syz.5.3136 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=0 CPU: 1 UID: 0 PID: 15197 Comm: syz.5.3136 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 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:464 oom_kill_process+0x295/0x350 mm/oom_kill.c:1031 out_of_memory+0x981/0xbc0 mm/oom_kill.c:1169 mem_cgroup_out_of_memory mm/memcontrol.c:1907 [inline] mem_cgroup_oom mm/memcontrol.c:1930 [inline] try_charge_memcg+0x621/0xa00 mm/memcontrol.c:2697 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321 alloc_pages_mpol+0xa9/0x1d0 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3742 [inline] __vmalloc_area_node mm/vmalloc.c:3892 [inline] __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb2115fde99 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:00007fb20f7cf028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fb211886360 RCX: 00007fb2115fde99 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007fb211693eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb2118863f8 R14: 00007fb211886360 R15: 00007ffc6cb9c938 memory: usage 307200kB, limit 307200kB, failcnt 16821 memory+swap: usage 379448kB, limit 9007199254740988kB, failcnt 0 kmem: usage 306916kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz5: cache 0 rss 4096 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 2944 workingset_refault_file 578 swap 73994240 swapcached 160468992 pgpgin 469344 pgpgout 469343 pgfault 390665 pgmajfault 1833 inactive_anon 0 active_anon 4096 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 4096 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 2944 total_workingset_refault_file 578 total_swap 73994240 total_swapcached 160468992 total_pgpgin 469344 total_pgpgout 469343 total_pgfault 390665 total_pgmajfault 1833 total_inactive_anon 0 total_active_anon 4096 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz5,task_memcg=/syz5,task=syz.5.3136,pid=15191,uid=0 Memory cgroup out of memory: Killed process 15191 (syz.5.3136) total-vm:90500kB, anon-rss:1256kB, file-rss:30556kB, shmem-rss:0kB, UID:0 pgtables:152kB oom_score_adj:0