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BUG: KCSAN: data-race in lru_add_drain_all / lru_cache_add

write to 0xffff88813bc27550 of 1 bytes by task 20850 on cpu 0:
 pagevec_add include/linux/pagevec.h:74 [inline]
 lru_cache_add+0x7c/0x160 mm/swap.c:461
 lru_cache_add_inactive_or_unevictable+0x46/0x160 mm/swap.c:493
 wp_page_copy+0x881/0x1570 mm/memory.c:2910
 do_wp_page+0x4cf/0x740 arch/x86/include/asm/atomic.h:95
 handle_pte_fault mm/memory.c:4336 [inline]
 __handle_mm_fault mm/memory.c:4453 [inline]
 handle_mm_fault+0x1463/0x1840 mm/memory.c:4551
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x2a0 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

read to 0xffff88813bc27550 of 1 bytes by task 20853 on cpu 1:
 pagevec_count include/linux/pagevec.h:61 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:813
 migrate_prep mm/migrate.c:73 [inline]
 do_pages_move mm/migrate.c:1772 [inline]
 kernel_move_pages+0x2ca/0xb30 mm/migrate.c:1988
 __do_sys_move_pages mm/migrate.c:2002 [inline]
 __se_sys_move_pages mm/migrate.c:1997 [inline]
 __x64_sys_move_pages+0x74/0x90 mm/migrate.c:1997
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20853 Comm: syz-executor.2 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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