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BUG: KCSAN: data-race in __ps2_command / ps2_handle_response

write to 0xffff8881027bc660 of 1 bytes by interrupt on cpu 0:
 ps2_handle_response+0x40/0x140 drivers/input/serio/libps2.c:463
 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+0x39/0x90 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:638

read to 0xffff8881027bc660 of 1 bytes by task 5573 on cpu 1:
 __ps2_command+0x4f8/0xa40 drivers/input/serio/libps2.c:288
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:332
 synaptics_detect+0x8c/0x110 drivers/input/mouse/synaptics.c:105
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1009 [inline]
 psmouse_extensions+0x7ea/0x1790 drivers/input/mouse/psmouse-base.c:1104
 __psmouse_reconnect+0x31e/0x620 drivers/input/mouse/psmouse-base.c:1728
 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: 0x02 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5573 Comm: kworker/1:3 Not tainted 5.13.0-rc6-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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