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BUG: KCSAN: data-race in __lru_add_drain_all / __pagevec_lru_add

write to 0xffff888237c27998 of 1 bytes by task 6733 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:57 [inline]
 __pagevec_lru_add+0x2f5/0x320 mm/swap.c:1063
 lru_add_drain_cpu+0x6d/0x260 mm/swap.c:601
 lru_add_drain+0x1c/0x50 mm/swap.c:707
 exit_mmap+0xf8/0x380 mm/mmap.c:3143
 __mmput+0x27/0x1b0 kernel/fork.c:1183
 mmput+0x3d/0x50 kernel/fork.c:1205
 exit_mm+0xdb/0x170 kernel/exit.c:510
 do_exit+0x53e/0x1700 kernel/exit.c:782
 do_group_exit+0xa5/0x160 kernel/exit.c:925
 get_signal+0x14ee/0x15a0 kernel/signal.c:2904
 arch_do_signal_or_restart+0x87/0x2b0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop kernel/entry/common.c:180 [inline]
 exit_to_user_mode_prepare+0xc1/0x140 kernel/entry/common.c:215
 __syscall_exit_to_user_mode_work kernel/entry/common.c:297 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:308
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237c27998 of 1 bytes by task 1833 on cpu 1:
 pagevec_count include/linux/pagevec.h:62 [inline]
 __lru_add_drain_all+0x118/0x3e0 mm/swap.c:824
 lru_add_drain_all+0xc/0x10 mm/swap.c:847
 invalidate_bdev+0x56/0x80 block/bdev.c:87
 ext4_put_super+0x408/0x610 fs/ext4/super.c:1271
 generic_shutdown_super+0xdf/0x250 fs/super.c:462
 kill_block_super+0x4a/0x90 fs/super.c:1394
 deactivate_locked_super+0x6a/0xb0 fs/super.c:332
 deactivate_super+0x85/0x90 fs/super.c:363
 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1186
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1193
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:183 [inline]
 exit_to_user_mode_prepare+0x122/0x140 kernel/entry/common.c:215
 __syscall_exit_to_user_mode_work kernel/entry/common.c:297 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:308
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x03 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1833 Comm: syz-executor.3 Not tainted 5.17.0-syzkaller-13788-gd0d642a5d365-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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