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BUG: KCSAN: data-race in lruvec_lru_size / mem_cgroup_update_lru_size

read to 0xffff8881001b81e8 of 8 bytes by task 32484 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:546 [inline]
 lruvec_lru_size+0x7d/0x240 mm/vmscan.c:359
 get_scan_count mm/vmscan.c:2464 [inline]
 shrink_node_memcg+0x1cd/0xf80 mm/vmscan.c:2573
 shrink_node+0x164/0xb30 mm/vmscan.c:2808
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881001b81e8 of 8 bytes by task 32492 on cpu 1:
 mem_cgroup_update_lru_size+0xa2/0x110 mm/memcontrol.c:1291
 update_lru_size include/linux/mm_inline.h:43 [inline]
 del_page_from_lru_list include/linux/mm_inline.h:65 [inline]
 isolate_lru_page+0x42b/0x610 mm/vmscan.c:1813
 migrate_page_add+0xe7/0x340 mm/mempolicy.c:977
 queue_pages_pte_range+0xa6e/0xbf0 mm/mempolicy.c:540
 walk_pmd_range mm/pagewalk.c:53 [inline]
 walk_pud_range mm/pagewalk.c:112 [inline]
 walk_p4d_range mm/pagewalk.c:139 [inline]
 walk_pgd_range mm/pagewalk.c:166 [inline]
 __walk_page_range+0x9d8/0xed0 mm/pagewalk.c:261
 walk_page_range+0x133/0x260 mm/pagewalk.c:349
 queue_pages_range mm/mempolicy.c:689 [inline]
 do_mbind mm/mempolicy.c:1285 [inline]
 kernel_mbind+0x436/0xaa0 mm/mempolicy.c:1419
 __do_sys_mbind mm/mempolicy.c:1426 [inline]
 __se_sys_mbind mm/mempolicy.c:1422 [inline]
 __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1422
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32492 Comm: syz-executor.5 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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