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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

write to 0xffff8881036ec040 of 8 bytes by interrupt on cpu 1:
 ps2_handle_ack+0x1b3/0x320 drivers/input/serio/libps2.c:447
 atkbd_interrupt+0xa5b/0xc30 drivers/input/keyboard/atkbd.c:424
 serio_interrupt+0x5d/0xe0 drivers/input/serio/serio.c:998
 i8042_interrupt+0x380/0x710 drivers/input/serio/i8042.c:606
 __handle_irq_event_percpu+0x92/0x400 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x60/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x17e/0x5a0 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+0x60/0x100 arch/x86/kernel/irq.c:250
 common_interrupt+0x9a/0xc0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
 atomic_inc include/linux/atomic/atomic-instrumented.h:191 [inline]
 page_ref_inc include/linux/page_ref.h:158 [inline]
 folio_ref_inc include/linux/page_ref.h:165 [inline]
 folio_get include/linux/mm.h:1215 [inline]
 get_page include/linux/mm.h:1220 [inline]
 copy_present_pte+0x110/0xa70 mm/memory.c:921
 copy_pte_range+0x3b7/0xc80 mm/memory.c:1038
 copy_pmd_range mm/memory.c:1124 [inline]
 copy_pud_range mm/memory.c:1161 [inline]
 copy_p4d_range mm/memory.c:1185 [inline]
 copy_page_range+0x5da/0x8e0 mm/memory.c:1283
 dup_mmap+0x76a/0xaf0 kernel/fork.c:694
 dup_mm+0x7c/0x210 kernel/fork.c:1548
 copy_mm+0xb1/0x120 kernel/fork.c:1597
 copy_process+0xd7f/0x2090 kernel/fork.c:2266
 kernel_clone+0x166/0x550 kernel/fork.c:2686
 __do_sys_clone kernel/fork.c:2827 [inline]
 __se_sys_clone kernel/fork.c:2811 [inline]
 __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2811
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881036ec040 of 8 bytes by task 29 on cpu 0:
 ps2_do_sendbyte+0x12e/0x380 drivers/input/serio/libps2.c:46
 __ps2_command+0x35e/0x8c0 drivers/input/serio/libps2.c:274
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:335
 atkbd_set_leds+0xad/0x1b0 drivers/input/keyboard/atkbd.c:596
 atkbd_event_work+0xb9/0x2e0 drivers/input/keyboard/atkbd.c:636
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 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: 29 Comm: kworker/0:1 Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: events atkbd_event_work
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