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BUG: KCSAN: data-race in __cgroup_account_cputime / cgroup_rstat_flush_locked

write to 0xffffe8ffffd76018 of 8 bytes by task 1826 on cpu 1:
 __cgroup_account_cputime+0x67/0xc0 kernel/cgroup/rstat.c:371
 cgroup_account_cputime include/linux/cgroup.h:797 [inline]
 update_curr+0xf6/0x280 kernel/sched/fair.c:877
 dequeue_entity+0x16/0x3f0 kernel/sched/fair.c:4371
 dequeue_task_fair+0xc1/0x3c0 kernel/sched/fair.c:5720
 dequeue_task kernel/sched/core.c:2030 [inline]
 deactivate_task kernel/sched/core.c:2044 [inline]
 __schedule+0x1fa/0x690 kernel/sched/core.c:6249
 schedule+0x81/0xb0 kernel/sched/core.c:6368
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0xcc/0x3a0 kernel/time/hrtimer.c:2044
 hrtimer_nanosleep+0x10b/0x200 kernel/time/hrtimer.c:2097
 common_nsleep+0x69/0x80 kernel/time/posix-timers.c:1227
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline]
 __se_sys_clock_nanosleep+0x1f1/0x220 kernel/time/posix-timers.c:1245
 __x64_sys_clock_nanosleep+0x51/0x60 kernel/time/posix-timers.c:1245
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffe8ffffd76018 of 8 bytes by task 22767 on cpu 0:
 cgroup_base_stat_flush kernel/cgroup/rstat.c:328 [inline]
 cgroup_rstat_flush_locked+0x2e8/0x7e0 kernel/cgroup/rstat.c:161
 cgroup_rstat_flush_irqsafe+0x24/0x40 kernel/cgroup/rstat.c:215
 __mem_cgroup_flush_stats mm/memcontrol.c:652 [inline]
 mem_cgroup_flush_stats+0x96/0xf0 mm/memcontrol.c:660
 shrink_node+0x2f9/0x1190 mm/vmscan.c:3198
 shrink_zones+0x2d1/0x5e0 mm/vmscan.c:3530
 do_try_to_free_pages+0x181/0x720 mm/vmscan.c:3588
 try_to_free_mem_cgroup_pages+0x1cb/0x420 mm/vmscan.c:3902
 reclaim_high mm/memcontrol.c:2300 [inline]
 mem_cgroup_handle_over_high+0x15b/0x480 mm/memcontrol.c:2484
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x139/0x190 kernel/entry/common.c:207
 irqentry_exit_to_user_mode+0x5/0x10 kernel/entry/common.c:313
 irqentry_exit+0xe/0x40 kernel/entry/common.c:404
 asm_exc_page_fault+0x1e/0x30

value changed: 0x00000013bd91c1f0 -> 0x00000013bd924712

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22767 Comm: syz-executor.1 Tainted: G        W         5.17.0-rc2-syzkaller-00060-g88808fbbead4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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