EXT4-fs (loop3): unmounting filesystem.
==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / pagevec_lru_move_fn

write to 0xffff888237c27b68 of 1 bytes by task 17897 on cpu 0:
 pagevec_reinit include/linux/pagevec.h:57 [inline]
 pagevec_lru_move_fn+0x4d6/0x500 mm/swap.c:214
 activate_page_drain mm/swap.c:337 [inline]
 lru_add_drain_cpu+0x230/0x260 mm/swap.c:626
 lru_add_drain+0x21/0x60 mm/swap.c:706
 exit_mmap+0xf8/0x380 mm/mmap.c:3157
 __mmput+0x27/0x1b0 kernel/fork.c:1187
 mmput+0x3d/0x50 kernel/fork.c:1208
 exit_mm+0xdb/0x170 kernel/exit.c:510
 do_exit+0x51d/0x1720 kernel/exit.c:782
 __x64_sys_exit_group+0x0/0x20 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x1b/0x20 kernel/exit.c:934
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff888237c27b68 of 1 bytes by task 9063 on cpu 1:
 pagevec_count include/linux/pagevec.h:62 [inline]
 need_activate_page_drain mm/swap.c:342 [inline]
 __lru_add_drain_all+0x229/0x3e0 mm/swap.c:831
 lru_add_drain_all+0xc/0x10 mm/swap.c:849
 invalidate_bdev+0x56/0x80 block/bdev.c:87
 ext4_put_super+0x510/0x810 fs/ext4/super.c:1279
 generic_shutdown_super+0xd5/0x240 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:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9063 Comm: syz-executor.3 Not tainted 5.19.0-rc1-syzkaller-00011-g9886142c7a22-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
EXT4-fs (loop3): unmounting filesystem.
EXT4-fs (loop3): unmounting filesystem.
EXT4-fs (loop3): unmounting filesystem.