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BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_interrupt

write to 0xffff888103dd4c48 of 8 bytes by interrupt on cpu 0:
 ps2_interrupt+0x50d/0x550 drivers/input/serio/libps2.c:-1
 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
 get_stack_info_noinstr+0x4/0x100 arch/x86/kernel/dumpstack_64.c:172
 get_stack_info+0x36/0xa0 arch/x86/kernel/dumpstack_64.c:199
 __unwind_start+0x136/0x1e0 arch/x86/kernel/unwind_orc.c:756
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x91/0xd0 kernel/stacktrace.c:122
 ref_tracker_free+0x94/0x3f0 lib/ref_tracker.c:306
 netdev_tracker_free include/linux/netdevice.h:4551 [inline]
 netdev_put include/linux/netdevice.h:4568 [inline]
 fib_nh_common_release+0x36/0x300 net/ipv4/fib_semantics.c:204
 fib6_nh_release+0x247/0x260 net/ipv6/route.c:3746
 fib6_info_destroy_rcu+0x85/0x160 net/ipv6/ip6_fib.c:177
 rcu_do_batch kernel/rcu/tree.c:2650 [inline]
 rcu_core+0x722/0xcd0 kernel/rcu/tree.c:2919
 rcu_core_si+0xd/0x20 kernel/rcu/tree.c:2936
 handle_softirqs+0xcc/0x2a0 kernel/softirq.c:645
 run_ksoftirqd+0x1c/0x30 kernel/softirq.c:1099
 smpboot_thread_fn+0x32f/0x520 kernel/smpboot.c:160
 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

read to 0xffff888103dd4c48 of 8 bytes by task 5924 on cpu 1:
 ps2_do_sendbyte+0x10b/0x320 drivers/input/serio/libps2.c:65
 ps2_sendbyte+0x40/0x60 drivers/input/serio/libps2.c:114
 cypress_ps2_sendbyte drivers/input/mouse/cypress_ps2.c:43 [inline]
 cypress_ps2_ext_cmd+0xb9/0x2e0 drivers/input/mouse/cypress_ps2.c:80
 cypress_send_ext_cmd+0x86/0x550 drivers/input/mouse/cypress_ps2.c:138
 cypress_detect+0x44/0x130 drivers/input/mouse/cypress_ps2.c:163
 psmouse_do_detect drivers/input/mouse/psmouse-base.c:995 [inline]
 psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1009 [inline]
 psmouse_extensions+0x547/0x960 drivers/input/mouse/psmouse-base.c:1132
 __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_reconnect_subtree drivers/input/serio/serio.c:578 [inline]
 drvctl_store+0x2ac/0xc20 drivers/input/serio/serio.c:364
 dev_attr_store+0x4a/0x70 drivers/base/core.c:2509
 sysfs_kf_write+0xfe/0x120 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x1d2/0x2e0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57f/0x9a0 fs/read_write.c:687
 ksys_write+0xdc/0x1a0 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:747
 x64_sys_call+0x154e/0x2550 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000001 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5924 Comm: syz.2.793 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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