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BUG: KCSAN: data-race in do_try_to_free_pages / shrink_node

read to 0xffff8882183a4078 of 8 bytes by task 19076 on cpu 1:
 shrink_node+0x9c5/0xfe0 mm/vmscan.c:2733
 shrink_zones mm/vmscan.c:2996 [inline]
 do_try_to_free_pages+0x245/0xb60 mm/vmscan.c:3049
 try_to_free_mem_cgroup_pages+0x205/0x4d0 mm/vmscan.c:3371
 try_charge+0x479/0xbf0 mm/memcontrol.c:2455
 __memcg_kmem_charge_memcg+0x4a/0xe0 mm/memcontrol.c:2837
 __memcg_kmem_charge+0xcf/0x1b0 mm/memcontrol.c:2877
 __alloc_pages_nodemask+0x26c/0x310 mm/page_alloc.c:4780
 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2207
 alloc_pages include/linux/gfp.h:532 [inline]
 __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
 pte_alloc_one+0x18/0x50 arch/x86/mm/pgtable.c:26
 do_fault_around mm/memory.c:3540 [inline]
 do_read_fault mm/memory.c:3580 [inline]
 do_fault mm/memory.c:3714 [inline]
 handle_pte_fault mm/memory.c:3945 [inline]
 __handle_mm_fault+0x2be6/0x2e00 mm/memory.c:4075
 handle_mm_fault+0x21b/0x530 mm/memory.c:4112
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

write to 0xffff8882183a4078 of 8 bytes by task 18946 on cpu 0:
 snapshot_refaults mm/vmscan.c:3013 [inline]
 do_try_to_free_pages+0x75f/0xb60 mm/vmscan.c:3072
 try_to_free_mem_cgroup_pages+0x205/0x4d0 mm/vmscan.c:3371
 try_charge+0x479/0xbf0 mm/memcontrol.c:2455
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6404
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6419
 wp_page_copy+0x322/0x1040 mm/memory.c:2428
 do_wp_page+0x192/0xeb0 mm/memory.c:2724
 handle_pte_fault mm/memory.c:3961 [inline]
 __handle_mm_fault+0x1d16/0x2e00 mm/memory.c:4075
 handle_mm_fault+0x21b/0x530 mm/memory.c:4112
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18946 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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