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BUG: KCSAN: data-race in __ps2_command / ps2_handle_response

write to 0xffff888100de4e50 of 8 bytes by interrupt on cpu 0:
 ps2_handle_response+0x98/0x140 drivers/input/serio/libps2.c:466
 psmouse_interrupt+0x6d4/0x930 drivers/input/mouse/psmouse-base.c:369
 serio_interrupt+0x5d/0xe0 drivers/input/serio/serio.c:1002
 i8042_interrupt+0x39e/0x720 drivers/input/serio/i8042.c:602
 __handle_irq_event_percpu+0x93/0x3f0 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0xb0/0x160 kernel/irq/handle.c:213
 handle_edge_irq+0x17e/0x600 kernel/irq/chip.c:819
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x38/0xb0 arch/x86/kernel/irq.c:250
 common_interrupt+0x73/0x90 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:638
 _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:192
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 __test_set_page_writeback+0x420/0x500 mm/page-writeback.c:2800
 ext4_bio_write_page+0xee/0xa40 fs/ext4/page-io.c:450
 mpage_submit_page fs/ext4/inode.c:2100 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2348 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2487 [inline]
 ext4_writepages+0x1050/0x1d10 fs/ext4/inode.c:2800
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __writeback_single_inode+0x80/0x450 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x564/0xf10 fs/fs-writeback.c:1732
 __writeback_inodes_wb fs/fs-writeback.c:1801 [inline]
 wb_writeback+0x327/0x700 fs/fs-writeback.c:1907
 wb_check_start_all fs/fs-writeback.c:2031 [inline]
 wb_do_writeback+0x330/0x510 fs/fs-writeback.c:2057
 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2091
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888100de4e50 of 8 bytes by task 1589 on cpu 1:
 __ps2_command+0x39d/0xa40 drivers/input/serio/libps2.c:285
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:332
 psmouse_probe drivers/input/mouse/psmouse-base.c:1262 [inline]
 __psmouse_reconnect+0x22e/0x620 drivers/input/mouse/psmouse-base.c:1725
 psmouse_reconnect+0x13/0x20 drivers/input/mouse/psmouse-base.c:1766
 serio_reconnect_driver drivers/input/serio/serio.c:59 [inline]
 serio_reconnect_port drivers/input/serio/serio.c:588 [inline]
 serio_handle_event+0x6be/0xc20 drivers/input/serio/serio.c:214
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

value changed: 0x000000000000000e -> 0x000000000000000a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1589 Comm: kworker/1:3 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long serio_handle_event
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