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BUG: KCSAN: data-race in __cgroup_account_cputime / cgroup_rstat_flush_locked

read-write to 0xffffe8ffffd6fc50 of 8 bytes by task 1828 on cpu 1:
 __cgroup_account_cputime+0x5a/0xb0 kernel/cgroup/rstat.c:379
 cgroup_account_cputime include/linux/cgroup.h:797 [inline]
 update_curr+0xf4/0x240 kernel/sched/fair.c:909
 put_prev_entity+0x1d/0x180 kernel/sched/fair.c:4616
 pick_next_task_fair+0x1f6/0x260 kernel/sched/fair.c:7339
 __pick_next_task kernel/sched/core.c:5695 [inline]
 pick_next_task kernel/sched/core.c:6204 [inline]
 __schedule+0x270/0x6c0 kernel/sched/core.c:6352
 schedule+0x71/0xa0 kernel/sched/core.c:6460
 exit_to_user_mode_loop+0xe5/0x130 kernel/entry/common.c:157
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffe8ffffd6fc50 of 8 bytes by task 14445 on cpu 0:
 cgroup_base_stat_flush kernel/cgroup/rstat.c:337 [inline]
 cgroup_rstat_flush_locked+0x2e3/0x750 kernel/cgroup/rstat.c:170
 cgroup_rstat_flush_irqsafe+0x24/0x40 kernel/cgroup/rstat.c:224
 __mem_cgroup_flush_stats mm/memcontrol.c:644 [inline]
 mem_cgroup_flush_stats+0xc1/0x110 mm/memcontrol.c:652
 shrink_node+0x2fc/0x1110 mm/vmscan.c:3126
 shrink_zones+0x2c1/0x5d0 mm/vmscan.c:3458
 do_try_to_free_pages+0x165/0x720 mm/vmscan.c:3516
 try_to_free_mem_cgroup_pages+0x1cd/0x420 mm/vmscan.c:3830
 reclaim_high+0xcd/0x110 mm/memcontrol.c:2325
 mem_cgroup_handle_over_high+0x75/0x120 mm/memcontrol.c:2509
 try_charge_memcg+0x926/0x960 mm/memcontrol.c:2738
 try_charge mm/memcontrol.c:2749 [inline]
 charge_memcg+0x63/0x2c0 mm/memcontrol.c:6625
 __mem_cgroup_charge+0x25/0xa0 mm/memcontrol.c:6646
 mem_cgroup_charge include/linux/memcontrol.h:683 [inline]
 wp_page_copy+0x1e8/0x12a0 mm/memory.c:3037
 do_wp_page+0x641/0xd00
 handle_pte_fault mm/memory.c:4645 [inline]
 __handle_mm_fault mm/memory.c:4763 [inline]
 handle_mm_fault+0x897/0xa40 mm/memory.c:4861
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30
 __put_user_nocheck_4+0x3/0x11
 schedule_tail+0x41/0x50 kernel/sched/core.c:5013
 ret_from_fork+0x8/0x30

value changed: 0x0000000260fe964e -> 0x0000000260ff794b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14445 Comm: syz-executor.4 Not tainted 5.18.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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