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BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64

read-write to 0xffffffff86e07a00 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:2067 [inline]
 __hrtimer_run_queues+0x1f8/0x510 kernel/time/hrtimer.c:2124
 hrtimer_interrupt+0x27b/0x860 kernel/time/hrtimer.c:2243
 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+0x32/0x80 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
 should_watch kernel/kcsan/core.c:280 [inline]
 check_access kernel/kcsan/core.c:760 [inline]
 __tsan_read8+0x118/0x190 kernel/kcsan/core.c:1033
 __obj_to_index mm/slab.h:338 [inline]
 slab_obj_ext mm/slab.h:784 [inline]
 __memcg_slab_free_hook+0xcd/0x340 mm/memcontrol.c:3702
 memcg_slab_free_hook mm/slub.c:2548 [inline]
 slab_free mm/slub.c:6496 [inline]
 kmem_cache_free+0x28b/0x3b0 mm/slub.c:6626
 __d_free+0x26/0x30 fs/dcache.c:346
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x722/0xcd0 kernel/rcu/tree.c:2919
 rcu_core_si+0xd/0x20 kernel/rcu/tree.c:2936
 handle_softirqs+0xcc/0x2a0 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0x44/0xe0 kernel/softirq.c:758
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
 schedule_debug kernel/sched/core.c:6094 [inline]
 __schedule+0x58/0xd20 kernel/sched/core.c:7125
 preempt_schedule_irq+0x2c/0x50 kernel/sched/core.c:7598
 raw_irqentry_exit_cond_resched+0x49/0x60 kernel/entry/common.c:145
 irqentry_exit_to_kernel_mode_preempt+0x2b/0x40 include/linux/irq-entry-common.h:468
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x7d/0x610 kernel/entry/common.c:167
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
 arch_atomic64_try_cmpxchg arch/x86/include/asm/atomic64_64.h:101 [inline]
 raw_atomic64_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:4296 [inline]
 raw_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:1482 [inline]
 atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4458 [inline]
 __mutex_trylock_fast kernel/locking/mutex.c:161 [inline]
 mutex_lock+0x60/0x90 kernel/locking/mutex.c:318
 selinux_set_mnt_opts+0xc1/0x10a0 security/selinux/hooks.c:662
 security_sb_set_mnt_opts+0x87/0x130 security/security.c:1140
 vfs_get_tree+0xf5/0x1d0 fs/super.c:1972
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount+0x288/0x8d0 fs/namespace.c:3848
 path_mount+0x4ad/0xb90 fs/namespace.c:4168
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4374
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4374
 x64_sys_call+0xc3b/0x2550 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86e07a00 of 8 bytes by task 6801 on cpu 1:
 mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:788
 count_shadow_nodes+0x6a/0x250 mm/workingset.c:689
 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:6222 [inline]
 shrink_node+0x6b8/0x2000 mm/vmscan.c:6264
 shrink_zones mm/vmscan.c:6503 [inline]
 do_try_to_free_pages+0x408/0xca0 mm/vmscan.c:6565
 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6887
 mem_cgroup_resize_max+0x13d/0x290 mm/memcontrol-v1.c:1816
 mem_cgroup_write+0x132/0x1c0 mm/memcontrol-v1.c:-1
 cgroup_file_write+0x197/0x350 kernel/cgroup/cgroup.c:4412
 kernfs_fop_write_iter+0x1d2/0x2e0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57f/0x9a0 fs/read_write.c:687
 ksys_write+0xdc/0x1a0 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:747
 x64_sys_call+0x154e/0x2550 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000ffffc403 -> 0x00000000ffffc404

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6801 Comm: syz.2.1014 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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