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BUG: KCSAN: data-race in __ps2_command / ps2_interrupt

write to 0xffff888103fbc658 of 1 bytes by interrupt on cpu 0:
 ps2_handle_response drivers/input/serio/libps2.c:479 [inline]
 ps2_interrupt+0x1be/0x550 drivers/input/serio/libps2.c:608
 serio_interrupt+0x66/0xf0 drivers/input/serio/serio.c:967
 i8042_handle_data+0x388/0x680 drivers/input/serio/i8042.c:598
 i8042_interrupt+0x15/0x90 drivers/input/serio/i8042.c:605
 __handle_irq_event_percpu+0x8b/0x480 kernel/irq/handle.c:209
 handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
 handle_irq_event+0x64/0xf0 kernel/irq/handle.c:263
 handle_edge_irq+0x155/0x440 kernel/irq/chip.c:859
 generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
 handle_irq arch/x86/kernel/irq.c:209 [inline]
 call_irq_handler arch/x86/kernel/irq.c:-1 [inline]
 __common_interrupt+0x60/0xb0 arch/x86/kernel/irq.c:280
 common_interrupt+0x7e/0x90 arch/x86/kernel/irq.c:273
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
 kcsan_setup_watchpoint+0x3e8/0x450 kernel/kcsan/core.c:705
 wg_ratelimiter_gc_entries+0x62/0x330 drivers/net/wireguard/ratelimiter.c:64
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888103fbc658 of 1 bytes by task 3374 on cpu 1:
 __ps2_command+0x591/0xaa0 drivers/input/serio/libps2.c:343
 ps2_command+0x52/0x90 drivers/input/serio/libps2.c:403
 ps2pp_detect+0xa2/0x940 drivers/input/mouse/logips2pp.c:372
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:987 [inline]
 psmouse_try_protocol+0x25e/0x310 drivers/input/mouse/psmouse-base.c:1001
 psmouse_extensions+0x7ec/0x960 drivers/input/mouse/psmouse-base.c:1154
 __psmouse_reconnect+0x3da/0x8b0 drivers/input/mouse/psmouse-base.c:1685
 psmouse_reconnect+0x17/0x20 drivers/input/mouse/psmouse-base.c:1723
 serio_reconnect_driver drivers/input/serio/serio.c:52 [inline]
 serio_reconnect_port drivers/input/serio/serio.c:558 [inline]
 serio_handle_event+0x1c7/0xac0 drivers/input/serio/serio.c:201
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x02 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3374 Comm: kworker/1:3 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_long serio_handle_event
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