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BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

read to 0xffff88812c1299e0 of 1 bytes by task 13629 on cpu 0:
 lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746
 migrate_prep+0x17/0x20 mm/migrate.c:72
 do_mbind+0x302/0xa40 mm/mempolicy.c:1282
 kernel_mbind+0x111/0x130 mm/mempolicy.c:1438
 __do_sys_mbind mm/mempolicy.c:1445 [inline]
 __se_sys_mbind mm/mempolicy.c:1441 [inline]
 __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1441
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812c1299e0 of 1 bytes by task 13628 on cpu 1:
 pagevec_add include/linux/pagevec.h:81 [inline]
 __lru_cache_add+0xbf/0x1d0 mm/swap.c:410
 lru_cache_add+0x1f/0x30 mm/swap.c:447
 putback_lru_page+0x35/0xd0 mm/vmscan.c:984
 mlock_vma_page+0x1c5/0x200 mm/mlock.c:101
 follow_page_pte+0xb46/0xd20 mm/gup.c:294
 follow_pmd_mask mm/gup.c:415 [inline]
 follow_pud_mask mm/gup.c:460 [inline]
 follow_p4d_mask mm/gup.c:486 [inline]
 follow_page_mask+0x7b0/0x1100 mm/gup.c:545
 __get_user_pages+0x3a0/0x1130 mm/gup.c:849
 populate_vma_page_range+0xe6/0x100 mm/gup.c:1235
 __mm_populate+0x168/0x2a0 mm/gup.c:1283
 mm_populate include/linux/mm.h:2347 [inline]
 vm_mmap_pgoff+0x181/0x190 mm/util.c:511
 ksys_mmap_pgoff+0x99/0x420 mm/mmap.c:1607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13628 Comm: syz-executor.1 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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