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BUG: KCSAN: data-race in lru_add_drain_all / pagevec_lru_move_fn

write to 0xffff88813bc276f0 of 1 bytes by task 22529 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:63 [inline]
 pagevec_lru_move_fn+0x175/0x190 mm/swap.c:232
 __pagevec_lru_add mm/swap.c:1070 [inline]
 lru_add_drain_cpu+0x75/0x290 mm/swap.c:630
 lru_add_drain+0x30/0x70 mm/swap.c:734
 follow_page_pte+0x9ae/0xb90 mm/gup.c:529
 follow_pmd_mask+0x4b0/0xeb0 mm/gup.c:607
 follow_pud_mask mm/gup.c:702 [inline]
 follow_p4d_mask mm/gup.c:728 [inline]
 follow_page_mask+0x382/0x540 mm/gup.c:787
 __get_user_pages+0x8a7/0xe50 mm/gup.c:1095
 populate_vma_page_range mm/gup.c:1430 [inline]
 __mm_populate+0x24d/0x340 mm/gup.c:1478
 mm_populate include/linux/mm.h:2590 [inline]
 __do_sys_mlockall mm/mlock.c:828 [inline]
 __se_sys_mlockall+0x22b/0x250 mm/mlock.c:804
 __x64_sys_mlockall+0x1b/0x20 mm/mlock.c:804
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88813bc276f0 of 1 bytes by task 4901 on cpu 1:
 pagevec_count include/linux/pagevec.h:68 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:837
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 blk_drop_partitions+0x5a/0x1d0 block/partitions/core.c:636
 bdev_disk_changed+0x88/0x310 fs/block_dev.c:1393
 blkdev_reread_part block/ioctl.c:103 [inline]
 blkdev_common_ioctl+0xdbb/0x1170 block/ioctl.c:552
 blkdev_ioctl+0x16e/0x3f0 block/ioctl.c:621
 block_ioctl+0x6d/0x80 fs/block_dev.c:1869
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4901 Comm: systemd-udevd Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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