==================================================================
BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_interrupt

write to 0xffff888103ce4e48 of 8 bytes by interrupt on cpu 0:
 ps2_interrupt+0x50d/0x550 drivers/input/serio/libps2.c:-1
 serio_interrupt+0x63/0xe0 drivers/input/serio/serio.c:967
 i8042_handle_data+0x36c/0x650 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
 pfn_pte arch/x86/include/asm/pgtable.h:734 [inline]
 mk_pte include/linux/mm.h:2622 [inline]
 set_pte_range+0xa3/0x4f0 mm/memory.c:5645
 filemap_map_order0_folio mm/filemap.c:3889 [inline]
 filemap_map_pages+0x579/0xef0 mm/filemap.c:3960
 do_fault_around mm/memory.c:5896 [inline]
 do_read_fault mm/memory.c:5929 [inline]
 do_fault mm/memory.c:6072 [inline]
 do_pte_missing mm/memory.c:4638 [inline]
 handle_pte_fault mm/memory.c:6496 [inline]
 __handle_mm_fault mm/memory.c:6645 [inline]
 handle_mm_fault+0x20ff/0x3ae0 mm/memory.c:6814
 do_user_addr_fault+0x636/0x1060 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

read to 0xffff888103ce4e48 of 8 bytes by task 5939 on cpu 1:
 ps2_do_sendbyte+0x10b/0x320 drivers/input/serio/libps2.c:65
 __ps2_command+0x364/0xaa0 drivers/input/serio/libps2.c:322
 ps2_command+0x52/0x90 drivers/input/serio/libps2.c:403
 alps_rpt_cmd+0x7a/0x150 drivers/input/mouse/alps.c:1780
 alps_identify+0x151/0x5e0 drivers/input/mouse/alps.c:2909
 alps_detect+0x31/0x250 drivers/input/mouse/alps.c:3182
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:995 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1009 [inline]
 psmouse_extensions+0x5e6/0x960 drivers/input/mouse/psmouse-base.c:1140
 __psmouse_reconnect+0x3dd/0x880 drivers/input/mouse/psmouse-base.c:1685
 psmouse_reconnect+0x23/0x40 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+0x1bc/0x990 drivers/input/serio/serio.c:201
 process_one_work kernel/workqueue.c:3387 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3470
 worker_thread+0x569/0x750 kernel/workqueue.c:3551
 kthread+0x223/0x270 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: 0x0000000000000001 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5939 Comm: kworker/1:8 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_long serio_handle_event
==================================================================