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BUG: KCSAN: data-race in lru_add_drain_all / lru_cache_add_inactive_or_unevictable

write to 0xffff888237d26468 of 1 bytes by task 6846 on cpu 1:
 pagevec_add include/linux/pagevec.h:74 [inline]
 lru_cache_add mm/swap.c:461 [inline]
 lru_cache_add_inactive_or_unevictable+0xa9/0x250 mm/swap.c:493
 do_anonymous_page+0x709/0x8b0 mm/memory.c:3587
 handle_pte_fault mm/memory.c:4316 [inline]
 __handle_mm_fault mm/memory.c:4453 [inline]
 handle_mm_fault+0x96f/0x1a70 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+0x94/0x230 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

read to 0xffff888237d26468 of 1 bytes by task 6835 on cpu 0:
 pagevec_count include/linux/pagevec.h:61 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:813
 migrate_prep+0xa/0x10 mm/migrate.c:73
 do_mbind+0x3f2/0xfc0 mm/mempolicy.c:1326
 kernel_mbind mm/mempolicy.c:1478 [inline]
 __do_sys_mbind mm/mempolicy.c:1485 [inline]
 __se_sys_mbind mm/mempolicy.c:1481 [inline]
 __x64_sys_mbind+0x142/0x170 mm/mempolicy.c:1481
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6835 Comm: syz-executor.5 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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