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BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

read to 0xffff88812be27620 of 1 bytes by task 11805 on cpu 1:
 lru_add_drain_all+0xf5/0x350 mm/swap.c:728
 migrate_prep+0x17/0x20 mm/migrate.c:72
 do_mbind mm/mempolicy.c:1265 [inline]
 kernel_mbind+0x9e7/0xaa0 mm/mempolicy.c:1419
 __do_sys_mbind mm/mempolicy.c:1426 [inline]
 __se_sys_mbind mm/mempolicy.c:1422 [inline]
 __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1422
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812be27620 of 1 bytes by task 11804 on cpu 0:
 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
 do_anonymous_page mm/memory.c:3041 [inline]
 handle_pte_fault mm/memory.c:3847 [inline]
 __handle_mm_fault+0x1a37/0x2c70 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 faultin_page mm/gup.c:640 [inline]
 __get_user_pages+0x485/0x1160 mm/gup.c:845
 __get_user_pages_locked mm/gup.c:1023 [inline]
 get_user_pages_remote+0x206/0x3e0 mm/gup.c:1163
 get_arg_page fs/exec.c:217 [inline]
 copy_strings.isra.0+0x31a/0x660 fs/exec.c:560
 copy_strings_kernel+0x73/0xb0 fs/exec.c:605
 __do_execve_file.isra.0+0xa5c/0x11d0 fs/exec.c:1807
 do_execveat_common fs/exec.c:1868 [inline]
 do_execve fs/exec.c:1885 [inline]
 __do_sys_execve fs/exec.c:1961 [inline]
 __se_sys_execve fs/exec.c:1956 [inline]
 __x64_sys_execve+0x62/0x80 fs/exec.c:1956
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11804 Comm: udevd Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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