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

write to 0xffff88812c0299e0 of 1 bytes by task 24994 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:63 [inline]
 pagevec_lru_move_fn+0x163/0x180 mm/swap.c:216
 __pagevec_lru_add mm/swap.c:985 [inline]
 lru_add_drain_cpu+0x178/0x2e0 mm/swap.c:599
 lru_add_drain+0x35/0x80 mm/swap.c:694
 unmap_region+0x6b/0x270 mm/mmap.c:2600
 __do_munmap+0x661/0xb60 mm/mmap.c:2823
 __vm_munmap+0xb2/0x130 mm/mmap.c:2846
 __do_sys_munmap mm/mmap.c:2872 [inline]
 __se_sys_munmap mm/mmap.c:2868 [inline]
 __x64_sys_munmap+0x4c/0x60 mm/mmap.c:2868
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812c0299e0 of 1 bytes by task 8041 on cpu 1:
 lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746
 invalidate_bdev+0x6e/0x90 fs/block_dev.c:97
 ext4_put_super+0x3f3/0x790 fs/ext4/super.c:1026
 generic_shutdown_super+0xfc/0x260 fs/super.c:462
 kill_block_super+0x60/0xb0 fs/super.c:1442
 deactivate_locked_super+0x64/0xb0 fs/super.c:335
 deactivate_super fs/super.c:366 [inline]
 deactivate_super+0xca/0xe0 fs/super.c:362
 cleanup_mnt+0x27f/0x330 fs/namespace.c:1102
 __cleanup_mnt+0x1f/0x30 fs/namespace.c:1109
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8041 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
==================================================================