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BUG: KCSAN: data-race in lruvec_lru_size / mem_cgroup_update_lru_size

write to 0xffff888100036a08 of 8 bytes by task 7840 on cpu 1:
 mem_cgroup_update_lru_size+0x97/0x110 mm/memcontrol.c:1266
 update_lru_sizes mm/vmscan.c:1608 [inline]
 isolate_lru_pages+0x77c/0x910 mm/vmscan.c:1717
 shrink_active_list+0x14e/0xb30 mm/vmscan.c:2016
 shrink_list mm/vmscan.c:2158 [inline]
 shrink_lruvec+0x71e/0xd20 mm/vmscan.c:2482
 shrink_node_memcgs mm/vmscan.c:2671 [inline]
 shrink_node+0x30a/0x1000 mm/vmscan.c:2777
 shrink_zones mm/vmscan.c:2980 [inline]
 do_try_to_free_pages+0x230/0xb30 mm/vmscan.c:3033
 try_to_free_mem_cgroup_pages+0x1f7/0x4b0 mm/vmscan.c:3355
 reclaim_high.constprop.0+0xee/0x140 mm/memcontrol.c:2232
 mem_cgroup_handle_over_high+0x8f/0x180 mm/memcontrol.c:2313
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20a/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x36e/0x390 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888100036a08 of 8 bytes by task 8864 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:536 [inline]
 lruvec_lru_size+0xe6/0x1a0 mm/vmscan.c:326
 get_scan_count mm/vmscan.c:2349 [inline]
 shrink_lruvec+0x170/0xd20 mm/vmscan.c:2452
 shrink_node_memcgs mm/vmscan.c:2671 [inline]
 shrink_node+0x30a/0x1000 mm/vmscan.c:2777
 shrink_zones mm/vmscan.c:2980 [inline]
 do_try_to_free_pages+0x230/0xb30 mm/vmscan.c:3033
 try_to_free_mem_cgroup_pages+0x1f7/0x4b0 mm/vmscan.c:3355
 reclaim_high.constprop.0+0xee/0x140 mm/memcontrol.c:2232
 mem_cgroup_handle_over_high+0x8f/0x180 mm/memcontrol.c:2313
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20a/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x218/0x240 arch/x86/entry/common.c:278
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:344

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8864 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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