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BUG: KCSAN: data-race in __count_memcg_events / mem_cgroup_css_rstat_flush

write to 0xffff888237d34540 of 4 bytes by task 1634 on cpu 0:
 mem_cgroup_css_rstat_flush+0x4ea/0x540 mm/memcontrol.c:5848
 cgroup_rstat_flush_locked+0x93a/0xe20 kernel/cgroup/rstat.c:322
 cgroup_rstat_flush+0x2a/0x120 kernel/cgroup/rstat.c:354
 do_flush_stats mm/memcontrol.c:745 [inline]
 flush_memcg_stats_dwork+0x50/0x90 mm/memcontrol.c:782
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x730 kernel/workqueue.c:3393
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read-write to 0xffff888237d34540 of 4 bytes by task 26830 on cpu 1:
 memcg_rstat_updated mm/memcontrol.c:725 [inline]
 __count_memcg_events+0xce/0x130 mm/memcontrol.c:962
 count_memcg_events include/linux/memcontrol.h:1096 [inline]
 count_memcg_event_mm include/linux/memcontrol.h:1120 [inline]
 mm_account_fault mm/memory.c:5470 [inline]
 handle_mm_fault+0x14da/0x27e0 mm/memory.c:5617
 do_user_addr_fault arch/x86/mm/fault.c:1383 [inline]
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x2f5/0x690 arch/x86/mm/fault.c:1533
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:125 [inline]
 _copy_from_user+0x80/0xd0 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:183 [inline]
 generic_map_update_batch+0x3c8/0x520 kernel/bpf/syscall.c:1886
 bpf_map_do_batch+0x2f8/0x440 kernel/bpf/syscall.c:5196
 __sys_bpf+0x2e5/0x7a0
 __do_sys_bpf kernel/bpf/syscall.c:5794 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5792 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5792
 x64_sys_call+0x86c/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000017 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26830 Comm: syz-executor.3 Tainted: G        W          6.9.0-syzkaller-08544-g4b377b4868ef #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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