==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / folio_batch_move_lru

write to 0xffff888237d29c88 of 1 bytes by task 26261 on cpu 1:
 folio_batch_reinit include/linux/pagevec.h:48 [inline]
 folio_batch_move_lru+0x2bf/0x2f0 mm/swap.c:225
 lru_add_drain_cpu+0x77/0x270 mm/swap.c:652
 lru_add_drain mm/swap.c:752 [inline]
 __folio_batch_release+0x5f/0xe0 mm/swap.c:1059
 folio_batch_release include/linux/pagevec.h:83 [inline]
 clean_bdev_aliases+0x300/0x380 fs/buffer.c:1742
 clean_bdev_bh_alias include/linux/buffer_head.h:219 [inline]
 __block_write_begin_int+0x515/0xf80 fs/buffer.c:2110
 __block_write_begin+0x5e/0x110 fs/buffer.c:2152
 ext4_write_begin+0x41e/0xba0
 generic_perform_write+0x1c9/0x410 mm/filemap.c:3930
 ext4_buffered_write_iter+0x1f6/0x370 fs/ext4/file.c:299
 ext4_file_write_iter+0x297/0xe10
 call_write_iter include/linux/fs.h:2085 [inline]
 aio_write+0x301/0x420 fs/aio.c:1628
 io_submit_one+0xb39/0x1250 fs/aio.c:2047
 __do_sys_io_submit fs/aio.c:2106 [inline]
 __se_sys_io_submit+0xf5/0x280 fs/aio.c:2076
 __x64_sys_io_submit+0x43/0x50 fs/aio.c:2076
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237d29c88 of 1 bytes by task 22871 on cpu 0:
 folio_batch_count include/linux/pagevec.h:53 [inline]
 cpu_needs_drain mm/swap.c:795 [inline]
 __lru_add_drain_all+0x137/0x420 mm/swap.c:889
 lru_add_drain_all+0x10/0x20 mm/swap.c:905
 invalidate_bdev+0x54/0x70 block/bdev.c:89
 ext4_put_super+0x51b/0x7e0 fs/ext4/super.c:1361
 generic_shutdown_super+0xdb/0x210 fs/super.c:646
 kill_block_super+0x2a/0x60 fs/super.c:1680
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7319
 deactivate_locked_super+0x7a/0x1c0 fs/super.c:477
 deactivate_super+0x9b/0xb0 fs/super.c:510
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1267
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1274
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xbd/0x130 kernel/entry/common.c:212
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x06 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22871 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller-00020-g9fc1ccccfd8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.