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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

write to 0xffff8881036f8040 of 8 bytes by interrupt on cpu 1:
 ps2_handle_ack+0x1c5/0x330 drivers/input/serio/libps2.c:447
 atkbd_interrupt+0xbe6/0xd80 drivers/input/keyboard/atkbd.c:424
 serio_interrupt+0x61/0xe0 drivers/input/serio/serio.c:998
 i8042_interrupt+0x3b3/0x780 drivers/input/serio/i8042.c:606
 __handle_irq_event_percpu+0x91/0x490 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x167/0x590 kernel/irq/chip.c:834
 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
 handle_irq arch/x86/kernel/irq.c:238 [inline]
 __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257
 common_interrupt+0x7a/0x90 arch/x86/kernel/irq.c:247
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
 is_atomic kernel/kcsan/core.c:260 [inline]
 should_watch kernel/kcsan/core.c:277 [inline]
 check_access kernel/kcsan/core.c:752 [inline]
 __tsan_read8+0xf7/0x180 kernel/kcsan/core.c:1025
 mtree_range_walk lib/maple_tree.c:2958 [inline]
 mas_state_walk+0x28b/0x5d0 lib/maple_tree.c:3881
 mas_walk+0x1f/0xd0 lib/maple_tree.c:5109
 lock_vma_under_rcu+0x89/0x290 mm/memory.c:5279
 do_user_addr_fault arch/x86/mm/fault.c:1341 [inline]
 handle_page_fault arch/x86/mm/fault.c:1534 [inline]
 exc_page_fault+0x16e/0x780 arch/x86/mm/fault.c:1590
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff8881036f8040 of 8 bytes by task 3288 on cpu 0:
 ps2_do_sendbyte+0x190/0x380 drivers/input/serio/libps2.c:46
 __ps2_command+0x353/0x910 drivers/input/serio/libps2.c:274
 ps2_command+0x54/0x90 drivers/input/serio/libps2.c:335
 atkbd_set_leds+0xad/0x1b0 drivers/input/keyboard/atkbd.c:596
 atkbd_event_work+0x8d/0x300 drivers/input/keyboard/atkbd.c:636
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000000000001 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3288 Comm: kworker/0:9 Not tainted 6.4.0-syzkaller-01761-g6aeadf7896bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: events atkbd_event_work
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