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BUG: KCSAN: data-race in __percpu_ref_switch_mode / percpu_ref_switch_to_atomic_rcu

write to 0xffff888106f7d250 of 8 bytes by interrupt on cpu 0:
 percpu_ref_call_confirm_rcu lib/percpu-refcount.c:156 [inline]
 percpu_ref_switch_to_atomic_rcu+0x188/0x360 lib/percpu-refcount.c:205
 rcu_do_batch kernel/rcu/tree.c:2558 [inline]
 rcu_core+0xb95/0xd50 kernel/rcu/tree.c:2793
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2806
 __do_softirq+0x12c/0x275 kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0xa5/0xb0 kernel/softirq.c:637
 sysvec_apic_timer_interrupt+0x69/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
 acpi_safe_halt drivers/acpi/processor_idle.c:108 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:513 [inline]
 acpi_idle_enter+0x25b/0x2e0 drivers/acpi/processor_idle.c:648
 cpuidle_enter_state+0x2b6/0x750 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x1a3/0x240 kernel/sched/idle.c:306
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403
 rest_init+0xc9/0xd0 init/main.c:721
 arch_call_rest_init+0xa/0xb
 start_kernel+0x59e/0x623 init/main.c:1087
 secondary_startup_64_no_verify+0xb0/0xbb

read to 0xffff888106f7d250 of 8 bytes by task 9198 on cpu 1:
 __percpu_ref_switch_mode+0xe6/0x3b0 lib/percpu-refcount.c:275
 percpu_ref_resurrect+0xc2/0x110 lib/percpu-refcount.c:473
 io_refs_resurrect fs/io_uring.c:1099 [inline]
 __io_uring_register fs/io_uring.c:10018 [inline]
 __do_sys_io_uring_register+0xbfb/0x19a0 fs/io_uring.c:10130
 __se_sys_io_uring_register fs/io_uring.c:10110 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10110
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffffff818a3350 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9198 Comm: syz-executor.2 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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