================================================================== 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 check_kcov_mode kernel/kcov.c:185 [inline] write_comp_data kernel/kcov.c:246 [inline] __sanitizer_cov_trace_const_cmp8+0x36/0x90 kernel/kcov.c:321 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1375 [inline] __se_sys_clock_nanosleep+0xd4/0x260 kernel/time/posix-timers.c:1368 __x64_sys_clock_nanosleep+0x55/0x70 kernel/time/posix-timers.c:1368 x64_sys_call+0x146e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:231 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 27921 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 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 __kvmalloc_node_noprof+0x3d4/0x650 mm/slub.c:6758 futex_hash_allocate+0x190/0x9d0 kernel/futex/core.c:1812 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1958 __do_sys_prctl kernel/sys.c:2884 [inline] __se_sys_prctl+0xa3d/0x13f0 kernel/sys.c:2533 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2533 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000ffffff0f -> 0x00000000ffffff10 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 27921 Comm: syz.3.11625 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.3.11625 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=1000 CPU: 1 UID: 0 PID: 27921 Comm: syz.3.11625 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 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 __kvmalloc_node_noprof+0x3d4/0x650 mm/slub.c:6758 futex_hash_allocate+0x190/0x9d0 kernel/futex/core.c:1812 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1958 __do_sys_prctl kernel/sys.c:2884 [inline] __se_sys_prctl+0xa3d/0x13f0 kernel/sys.c:2533 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2533 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6ae56ac799 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:00007f6ae40ff028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007f6ae5925fa0 RCX: 00007f6ae56ac799 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007f6ae5742bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6ae5926038 R14: 00007f6ae5925fa0 R15: 00007ffd830a0168 memory: usage 307200kB, limit 307200kB, failcnt 3116 memory+swap: usage 307388kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307188kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz3: cache 0 rss 0 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 107 workingset_refault_file 258 swap 192512 swapcached 258048 pgpgin 154066 pgpgout 154063 pgfault 275702 pgmajfault 69 inactive_anon 0 active_anon 0 inactive_file 0 active_file 12288 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 0 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 107 total_workingset_refault_file 258 total_swap 192512 total_swapcached 258048 total_pgpgin 154066 total_pgpgout 154063 total_pgfault 275702 total_pgmajfault 69 total_inactive_anon 0 total_active_anon 0 total_inactive_file 0 total_active_file 12288 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz3,task_memcg=/syz3,task=syz.3.11625,pid=27919,uid=0 Memory cgroup out of memory: Killed process 27919 (syz.3.11625) total-vm:96076kB, anon-rss:1224kB, file-rss:21960kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000