================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff868099c0 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:232 [inline] tick_nohz_handler+0x7f/0x2d0 kernel/time/tick-sched.c:290 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 spin_needbreak include/linux/spinlock.h:465 [inline] copy_pte_range mm/memory.c:1141 [inline] copy_pmd_range mm/memory.c:1261 [inline] copy_pud_range mm/memory.c:1298 [inline] copy_p4d_range mm/memory.c:1322 [inline] copy_page_range+0xb66/0x3c20 mm/memory.c:1410 dup_mmap+0x885/0xf20 mm/mmap.c:1834 dup_mm kernel/fork.c:1485 [inline] copy_mm+0x11a/0x370 kernel/fork.c:1537 copy_process+0xd08/0x2000 kernel/fork.c:2175 kernel_clone+0x16c/0x5c0 kernel/fork.c:2605 __do_sys_clone kernel/fork.c:2748 [inline] __se_sys_clone kernel/fork.c:2732 [inline] __x64_sys_clone+0xe6/0x120 kernel/fork.c:2732 x64_sys_call+0x119c/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868099c0 of 8 bytes by task 5889 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:634 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+0x448/0x760 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6053 [inline] shrink_node+0x6c3/0x2120 mm/vmscan.c:6092 shrink_zones mm/vmscan.c:6336 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6398 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6726 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2357 try_charge mm/memcontrol.c:2499 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4702 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4788 __read_swap_cache_async+0x1df/0x350 mm/swap_state.c:441 swap_cluster_readahead+0x376/0x3e0 mm/swap_state.c:632 swapin_readahead+0xde/0x6f0 mm/swap_state.c:811 do_swap_page+0x301/0x2430 mm/memory.c:4586 handle_pte_fault mm/memory.c:6055 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x9a5/0x2c20 mm/memory.c:6364 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336 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:623 value changed: 0x000000010000c223 -> 0x000000010000c224 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 5889 Comm: syz.0.12109 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ================================================================== syz.0.12109 invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=1000 CPU: 1 UID: 0 PID: 5889 Comm: syz.0.12109 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x81/0x220 mm/oom_kill.c:467 oom_kill_process+0x342/0x400 mm/oom_kill.c:1040 out_of_memory+0x979/0xb80 mm/oom_kill.c:1178 mem_cgroup_out_of_memory mm/memcontrol.c:1649 [inline] mem_cgroup_oom mm/memcontrol.c:1672 [inline] try_charge_memcg+0x5e6/0x9e0 mm/memcontrol.c:2399 try_charge mm/memcontrol.c:2499 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4702 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4788 __read_swap_cache_async+0x1df/0x350 mm/swap_state.c:441 swap_cluster_readahead+0x376/0x3e0 mm/swap_state.c:632 swapin_readahead+0xde/0x6f0 mm/swap_state.c:811 do_swap_page+0x301/0x2430 mm/memory.c:4586 handle_pte_fault mm/memory.c:6055 [inline] __handle_mm_fault mm/memory.c:6195 [inline] handle_mm_fault+0x9a5/0x2c20 mm/memory.c:6364 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336 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:623 RIP: 0033:0x7ff740ebeb8a Code: c1 e8 32 89 c1 69 c0 40 42 0f 00 48 89 0c 24 29 c7 48 69 ff e8 03 00 00 48 89 7c 24 08 48 89 e7 e8 9b 63 ff ff 48 8b 54 24 18 <64> 48 2b 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 32 00 00 90 RSP: 002b:00007ffc887ed930 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 00007ff7410f5fa0 RCX: 0000000000000000 RDX: 9572f59dca9e3c00 RSI: 0000000000000000 RDI: 0000555557a58808 RBP: 00007ff7410f7da0 R08: 0000000000000000 R09: 7fffffffffffffff R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000c2b1a R13: 00007ff7410f6090 R14: ffffffffffffffff R15: 00007ffc887eda70 memory: usage 307200kB, limit 307200kB, failcnt 2794 memory+swap: usage 308488kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307200kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: cache 0 rss 0 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 9339 workingset_refault_file 2375 swap 1318912 swapcached 0 pgpgin 1174175 pgpgout 1174175 pgfault 1045522 pgmajfault 1498 inactive_anon 0 active_anon 0 inactive_file 0 active_file 0 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 9339 total_workingset_refault_file 2375 total_swap 1318912 total_swapcached 0 total_pgpgin 1174175 total_pgpgout 1174175 total_pgfault 1045522 total_pgmajfault 1498 total_inactive_anon 0 total_active_anon 0 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz.0.12109,pid=5889,uid=0 Memory cgroup out of memory: Killed process 5889 (syz.0.12109) total-vm:93828kB, anon-rss:1004kB, file-rss:22184kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000