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BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

read to 0xffff88812bf27620 of 1 bytes by task 11767 on cpu 0:
 lru_add_drain_all+0xf5/0x350 mm/swap.c:728
 migrate_prep+0x17/0x20 mm/migrate.c:72
 do_mbind mm/mempolicy.c:1267 [inline]
 kernel_mbind+0x9cf/0xad0 mm/mempolicy.c:1423
 __do_sys_mbind mm/mempolicy.c:1430 [inline]
 __se_sys_mbind mm/mempolicy.c:1426 [inline]
 __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1426
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812bf27620 of 1 bytes by task 11770 on cpu 1:
 pagevec_add include/linux/pagevec.h:81 [inline]
 __lru_cache_add+0xbf/0x1d0 mm/swap.c:405
 lru_cache_add mm/swap.c:442 [inline]
 lru_cache_add_active_or_unevictable+0xb6/0x1f0 mm/swap.c:472
 wp_page_copy+0x820/0x1120 mm/memory.c:2369
 do_wp_page+0x192/0x11f0 mm/memory.c:2628
 handle_pte_fault mm/memory.c:3865 [inline]
 __handle_mm_fault+0x1ab1/0x2c70 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 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:1202

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11770 Comm: udevd Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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