==================================================================
BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

read to 0xffff88812c0299e0 of 1 bytes by task 17671 on cpu 1:
 lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746
 migrate_prep+0x17/0x20 mm/migrate.c:72
 do_migrate_pages mm/mempolicy.c:1081 [inline]
 kernel_migrate_pages+0x36c/0x440 mm/mempolicy.c:1547
 __do_sys_migrate_pages mm/mempolicy.c:1566 [inline]
 __se_sys_migrate_pages mm/mempolicy.c:1562 [inline]
 __x64_sys_migrate_pages+0x5e/0x80 mm/mempolicy.c:1562
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812c0299e0 of 1 bytes by task 17653 on cpu 0:
 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
 __unmap_and_move mm/migrate.c:1143 [inline]
 unmap_and_move mm/migrate.c:1193 [inline]
 migrate_pages+0x67b/0x18e0 mm/migrate.c:1423
 do_mbind+0x937/0xa40 mm/mempolicy.c:1317
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17653 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================