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BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

write to 0xffff88812c129c40 of 1 bytes by task 20961 on cpu 1:
 pagevec_add include/linux/pagevec.h:81 [inline]
 __lru_cache_add+0xb8/0x1c0 mm/swap.c:410
 lru_cache_add mm/swap.c:447 [inline]
 lru_cache_add_active_or_unevictable+0xb0/0x1e0 mm/swap.c:477
 wp_page_copy+0x70e/0x1050 mm/memory.c:2717
 do_wp_page+0x224/0xca0 mm/memory.c:2982
 handle_pte_fault mm/memory.c:4231 [inline]
 __handle_mm_fault+0x2d96/0x2da0 mm/memory.c:4345
 handle_mm_fault+0x21c/0x540 mm/memory.c:4382
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

read to 0xffff88812c129c40 of 1 bytes by task 20963 on cpu 0:
 lru_add_drain_all+0x169/0x3a0 mm/swap.c:746
 migrate_prep+0x13/0x20 mm/migrate.c:73
 do_migrate_pages mm/mempolicy.c:1138 [inline]
 kernel_migrate_pages+0x354/0x420 mm/mempolicy.c:1604
 __do_sys_migrate_pages mm/mempolicy.c:1623 [inline]
 __se_sys_migrate_pages mm/mempolicy.c:1619 [inline]
 __x64_sys_migrate_pages+0x5a/0x70 mm/mempolicy.c:1619
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20963 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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