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BUG: KCSAN: data-race in __pagevec_lru_add / lru_add_drain_all

write to 0xffff88813bc27970 of 1 bytes by task 27030 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:60 [inline]
 __pagevec_lru_add+0x24b/0x280 mm/swap.c:1031
 lru_add_drain_cpu+0x6a/0x250 mm/swap.c:616
 lru_add_drain+0x30/0x70 mm/swap.c:720
 exit_mmap+0x199/0x400 mm/mmap.c:3215
 __mmput+0xa2/0x220 kernel/fork.c:1083
 mmput+0x38/0x40 kernel/fork.c:1104
 free_bprm+0xce/0x1f0 fs/exec.c:1477
 kernel_execve+0x4ff/0x650 fs/exec.c:1971
 call_usermodehelper_exec_async+0x1a1/0x250 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88813bc27970 of 1 bytes by task 1660 on cpu 1:
 pagevec_count include/linux/pagevec.h:65 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:823
 khugepaged_do_scan+0x47/0x320 mm/khugepaged.c:2202
 khugepaged+0x75/0x650 mm/khugepaged.c:2263
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1660 Comm: khugepaged Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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