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BUG: KCSAN: data-race in __count_memcg_events / mem_cgroup_css_rstat_flush

write to 0xffff888237d344c0 of 4 bytes by task 1605 on cpu 0:
 mem_cgroup_css_rstat_flush+0x4ea/0x540 mm/memcontrol.c:5848
 cgroup_rstat_flush_locked+0x848/0x980 kernel/cgroup/rstat.c:245
 cgroup_rstat_flush+0x26/0x40 kernel/cgroup/rstat.c:277
 do_flush_stats mm/memcontrol.c:745 [inline]
 flush_memcg_stats_dwork+0x50/0x90 mm/memcontrol.c:782
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 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 0xffff888237d344c0 of 4 bytes by task 17224 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:5475 [inline]
 handle_mm_fault+0x14da/0x27e0 mm/memory.c:5622
 faultin_page mm/gup.c:958 [inline]
 __get_user_pages+0x470/0xec0 mm/gup.c:1257
 populate_vma_page_range mm/gup.c:1697 [inline]
 __mm_populate+0x204/0x340 mm/gup.c:1800
 mm_populate include/linux/mm.h:3413 [inline]
 vm_mmap_pgoff+0x1a8/0x250 mm/util.c:578
 ksys_mmap_pgoff+0xc6/0x340 mm/mmap.c:1431
 x64_sys_call+0x1815/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:10
 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: 0x0000002d -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17224 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller-00232-gddb4c3f25b7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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