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BUG: KCSAN: data-race in __ps2_command / ps2_handle_response

write to 0xffff88812989d850 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
 __sanitizer_cov_trace_const_cmp8+0x0/0x90 kernel/kcov.c:286
 pte_none arch/x86/include/asm/pgtable.h:756 [inline]
 zap_pte_range+0x19a/0xe20 mm/memory.c:1234
 zap_pmd_range mm/memory.c:1374 [inline]
 zap_pud_range mm/memory.c:1403 [inline]
 zap_p4d_range mm/memory.c:1424 [inline]
 unmap_page_range+0x2dc/0x3d0 mm/memory.c:1445
 unmap_single_vma+0x157/0x210 mm/memory.c:1490
 unmap_vmas+0xc0/0x170 mm/memory.c:1522
 exit_mmap+0x1be/0x400 mm/mmap.c:3208
 __mmput+0x27/0x1c0 kernel/fork.c:1096
 mmput+0x3d/0x50 kernel/fork.c:1117
 exit_mm+0x350/0x440 kernel/exit.c:502
 do_exit+0x3ff/0x1560 kernel/exit.c:813
 do_group_exit+0xce/0x1a0 kernel/exit.c:923
 get_signal+0xfc3/0x1610 kernel/signal.c:2835
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812989d850 of 8 bytes by task 6496 on cpu 1:
 __ps2_command+0x39d/0xa40 drivers/input/serio/libps2.c:285
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:332
 alps_rpt_cmd+0x122/0x140 drivers/input/mouse/alps.c:1782
 alps_identify+0x104/0x1770 drivers/input/mouse/alps.c:2905
 alps_detect+0x2d/0x220 drivers/input/mouse/alps.c:3178
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1009 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1023 [inline]
 psmouse_extensions+0xda8/0x1790 drivers/input/mouse/psmouse-base.c:1154
 __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: 0x0000000000000006 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6496 Comm: kworker/1:4 Tainted: G        W         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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