================================================================== 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:1777 [inline] __hrtimer_run_queues+0x20c/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:1041 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1d0 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 mem_cgroup_calculate_protection+0x1a/0x70 mm/memcontrol.c:4684 shrink_node_memcgs mm/vmscan.c:6029 [inline] shrink_node+0x57a/0x2120 mm/vmscan.c:6095 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2355 try_charge mm/memcontrol.c:2497 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4700 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:4717 mem_cgroup_charge include/linux/memcontrol.h:662 [inline] shmem_alloc_and_add_folio mm/shmem.c:1920 [inline] shmem_get_folio_gfp+0x470/0xd60 mm/shmem.c:2533 shmem_get_folio mm/shmem.c:2639 [inline] shmem_write_begin+0xa8/0x190 mm/shmem.c:3289 generic_perform_write+0x184/0x490 mm/filemap.c:4242 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3464 iter_file_splice_write+0x666/0xa60 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x156/0x2a0 fs/splice.c:1161 splice_direct_to_actor+0x312/0x680 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1230 do_sendfile+0x380/0x650 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417 x64_sys_call+0x2bb4/0x3000 arch/x86/include/generated/asm/syscalls_64.h:41 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 14454 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:635 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:6056 [inline] shrink_node+0x6c3/0x2120 mm/vmscan.c:6095 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6401 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6729 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2355 try_charge mm/memcontrol.c:2497 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4700 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4786 __read_swap_cache_async+0x17b/0x2d0 mm/swap_state.c:481 swap_cluster_readahead+0x262/0x3c0 mm/swap_state.c:650 swapin_readahead+0xde/0x6f0 mm/swap_state.c:813 do_swap_page+0x2ae/0x2370 mm/memory.c:4713 handle_pte_fault mm/memory.c:6180 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x9a5/0x2be0 mm/memory.c:6487 do_user_addr_fault+0x630/0x1080 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: 0x00000000ffffe9eb -> 0x00000000ffffe9ec Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 14454 Comm: syz.0.4067 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ================================================================== syz.0.4067 invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 14454 Comm: syz.0.4067 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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:1046 out_of_memory+0x979/0xb80 mm/oom_kill.c:1184 mem_cgroup_out_of_memory mm/memcontrol.c:1650 [inline] mem_cgroup_oom mm/memcontrol.c:1673 [inline] try_charge_memcg+0x5e6/0x9e0 mm/memcontrol.c:2397 try_charge mm/memcontrol.c:2497 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4700 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4786 __read_swap_cache_async+0x17b/0x2d0 mm/swap_state.c:481 swap_cluster_readahead+0x262/0x3c0 mm/swap_state.c:650 swapin_readahead+0xde/0x6f0 mm/swap_state.c:813 do_swap_page+0x2ae/0x2370 mm/memory.c:4713 handle_pte_fault mm/memory.c:6180 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x9a5/0x2be0 mm/memory.c:6487 do_user_addr_fault+0x630/0x1080 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: 0033:0x7f402f5357fe Code: 0c 85 c0 74 e7 48 89 df 48 81 c3 f0 00 00 00 e8 28 c4 ff ff 48 39 eb 75 df 0f 1f 00 8b 05 b6 25 38 00 85 c0 0f 8e a3 fd ff ff ad 9c fe ff 49 39 c4 73 a0 48 8d 1d 91 07 38 00 83 3d 96 25 38 RSP: 002b:00007ffc05a8d960 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 00007f402f8b7da0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005555734e5808 RBP: 00007f402f8b7da0 R08: 0000000000000000 R09: 7fffffffffffffff R10: 0000000000000000 R11: 0000000000000293 R12: 000000000003ba89 R13: 00007f402f8b6090 R14: ffffffffffffffff R15: 00007ffc05a8da70 memory: usage 307200kB, limit 307200kB, failcnt 2533 memory+swap: usage 17448kB, limit 9007199254740988kB, failcnt 0 kmem: usage 3784kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: cache 0 rss 32768 shmem 0 mapped_file 0 dirty 0 writeback 8192 workingset_refault_anon 41 workingset_refault_file 0 swap 3047424 swapcached 36864 pgpgin 217760 pgpgout 217748 pgfault 246198 pgmajfault 31 inactive_anon 20480 active_anon 28672 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 32768 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 8192 total_workingset_refault_anon 41 total_workingset_refault_file 0 total_swap 3047424 total_swapcached 36864 total_pgpgin 217760 total_pgpgout 217748 total_pgfault 246198 total_pgmajfault 31 total_inactive_anon 20480 total_active_anon 28672 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.0.4067,pid=14454,uid=0 Memory cgroup out of memory: Killed process 14454 (syz.0.4067) total-vm:96136kB, anon-rss:1264kB, file-rss:22596kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000