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BUG: KCSAN: data-race in __cgroup_account_cputime / cgroup_rstat_flush_locked

read-write to 0xffffe8ffffd78118 of 8 bytes by task 3714 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
 dequeue_entity+0x16/0x3f0 kernel/sched/fair.c:4424
 dequeue_task_fair+0xaf/0x3a0 kernel/sched/fair.c:5773
 dequeue_task kernel/sched/core.c:2095 [inline]
 deactivate_task kernel/sched/core.c:2109 [inline]
 __schedule+0x203/0x6c0 kernel/sched/core.c:6342
 schedule+0x71/0xa0 kernel/sched/core.c:6460
 schedule_timeout+0x51/0x290 kernel/time/timer.c:1860
 unix_wait_for_peer+0x105/0x160 net/unix/af_unix.c:1397
 unix_dgram_sendmsg+0xbd7/0x1160 net/unix/af_unix.c:1993
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg net/socket.c:725 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2413
 ___sys_sendmsg net/socket.c:2467 [inline]
 __sys_sendmmsg+0x27c/0x4a0 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffe8ffffd78118 of 8 bytes by task 1849 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]
 flush_memcg_stats_dwork+0x97/0x110 mm/memcontrol.c:663
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000000b8eeb3ed -> 0x00000000b8effd17

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1849 Comm: kworker/u4:6 Not tainted 5.18.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_memcg_stats_dwork
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