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BUG: KCSAN: data-race in __lru_add_drain_all / __pagevec_lru_add

write to 0xffff888237d42528 of 1 bytes by task 6351 on cpu 1:
 pagevec_reinit include/linux/pagevec.h:56 [inline]
 __pagevec_lru_add+0x211/0x240 mm/swap.c:1066
 lru_add_drain_cpu+0x6d/0x270 mm/swap.c:619
 lru_add_drain+0x28/0x40 mm/swap.c:724
 exit_mmap+0x208/0x460 mm/mmap.c:3196
 __mmput+0x27/0x1c0 kernel/fork.c:1101
 mmput+0x3d/0x50 kernel/fork.c:1122
 exit_mm+0x2f7/0x3f0 kernel/exit.c:501
 do_exit+0x402/0x1530 kernel/exit.c:812
 do_group_exit+0xce/0x1a0 kernel/exit.c:922
 get_signal+0xfa3/0x15e0 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d42528 of 1 bytes by task 1037 on cpu 0:
 pagevec_count include/linux/pagevec.h:61 [inline]
 __lru_add_drain_all+0x12c/0x3e0 mm/swap.c:828
 lru_add_drain_all+0xc/0x10 mm/swap.c:850
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 bdev_disk_changed+0xf3/0xea0 block/partitions/core.c:677
 blkdev_get_whole+0x2f2/0x350 fs/block_dev.c:1267
 blkdev_get_by_dev+0x2ad/0x8d0 fs/block_dev.c:1415
 blkdev_reread_part block/ioctl.c:102 [inline]
 blkdev_common_ioctl+0xfc8/0x1040 block/ioctl.c:510
 blkdev_ioctl+0x16e/0x3c0 block/ioctl.c:579
 block_ioctl+0x6d/0x80 fs/block_dev.c:1602
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0d -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1037 Comm: systemd-udevd Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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