rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=c86/1/0x4000000000000002 softirq=37565/37566 fqs=22 (t=10501 jiffies g=60581 q=108) rcu: rcu_preempt kthread starved for 10452 jiffies! g60581 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28848 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3378 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4094 firmware_map_remove+0x19c/0x19c __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] _raw_spin_lock_irqsave+0x94/0xbf kernel/locking/spinlock.c:159 check_preemption_disabled lib/smp_processor_id.c:52 [inline] debug_smp_processor_id+0x2f/0x185 lib/smp_processor_id.c:57 schedule+0xd0/0x2a0 kernel/sched/core.c:4168 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898 usleep_range+0x160/0x160 kernel/time/timer.c:2093 atomic_add_return include/asm-generic/atomic-instrumented.h:71 [inline] rcu_dynticks_snap kernel/rcu/tree.c:311 [inline] rcu_dynticks_in_eqs_since kernel/rcu/tree.c:332 [inline] rcu_implicit_dynticks_qs+0x73/0xac0 kernel/rcu/tree.c:1042 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x62/0xe0 kernel/locking/spinlock.c:191 __next_timer_interrupt+0x190/0x190 kernel/time/timer.c:1512 prepare_to_swait_exclusive+0x110/0x110 kernel/sched/swait.c:98 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline] rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836 rcu_barrier+0x4b0/0x4b0 arch/x86/include/asm/paravirt.h:764 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x62/0xe0 kernel/locking/spinlock.c:191 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __kthread_parkme+0x13f/0x1e0 kernel/kthread.c:212 rcu_barrier+0x4b0/0x4b0 arch/x86/include/asm/paravirt.h:764 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 20511 Comm: syz-executor.3 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 lapic_can_unplug_cpu.cold+0x3b/0x3b nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296 trace_hardirqs_off+0x50/0x220 kernel/trace/trace_preemptirq.c:45 update_process_times+0x25/0x60 kernel/time/timer.c:1727 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584 tick_sched_do_timer+0x1a0/0x1a0 kernel/time/tick-sched.c:64 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:694 [inline] queued_spin_lock include/asm-generic/qspinlock.h:78 [inline] do_raw_spin_lock+0x129/0x2e0 kernel/locking/spinlock_debug.c:113 hrtimer_init+0x320/0x320 include/linux/compiler.h:199 ktime_get_update_offsets_now+0x2d6/0x450 kernel/time/timekeeping.c:2240 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:kvm_after_interrupt arch/x86/kvm/x86.h:340 [inline] RIP: 0010:handle_external_interrupt_irqoff+0x1a8/0x240 arch/x86/kvm/vmx/vmx.c:6274 Code: a0 0a 24 88 e8 b9 7a 80 02 65 48 89 2d c9 b7 e8 7e 48 c1 e3 20 4c 09 e3 4c 09 eb 48 89 e0 48 83 e4 f0 6a 18 50 9c 6a 10 ff d3 <48> c7 c7 a0 0a 24 88 e8 8c 7a 80 02 65 48 c7 05 98 b7 e8 7e 00 00 RSP: 0018:ffffc9000475faf8 EFLAGS: 00000086 ORIG_RAX: ffffffffffffff13 RAX: ffffc9000475faf8 RBX: ffffffff87e016e0 RCX: ffffc9000f89c000 RDX: 0000000000040000 RSI: ffffffff81194917 RDI: 0000000000000005 RBP: ffff888043660200 R08: ffff8880561c8180 R09: ffffed101443a302 R10: ffff8880a21d180f R11: ffffed101443a301 R12: 0000000087e00000 R13: 00000000000016e0 R14: fffffec8829c9e3d R15: ffff888043660200 __irqentry_text_start+0x8/0x8 kvm_before_interrupt arch/x86/kvm/x86.h:335 [inline] handle_external_interrupt_irqoff+0x187/0x240 arch/x86/kvm/vmx/vmx.c:6251 kvm_before_interrupt arch/x86/kvm/x86.h:335 [inline] handle_external_interrupt_irqoff+0x187/0x240 arch/x86/kvm/vmx/vmx.c:6251 vmx_handle_exit_irqoff+0x19d/0x320 arch/x86/kvm/vmx/vmx.c:6284 vcpu_enter_guest+0xbc8/0x59d0 arch/x86/kvm/x86.c:8428 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628 kvm_vcpu_reload_apic_access_page+0x300/0x300 include/linux/mm.h:1062 trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 set_irq_regs arch/x86/include/asm/irq_regs.h:27 [inline] smp_apic_timer_interrupt+0x1b6/0x600 arch/x86/kernel/apic/apic.c:1142 retint_kernel+0x2b/0x2b list_empty_careful include/linux/list.h:301 [inline] kvm_check_async_pf_completion+0x2a4/0x400 arch/x86/kvm/../../../virt/kvm/async_pf.c:137 vcpu_run arch/x86/kvm/x86.c:8556 [inline] kvm_arch_vcpu_ioctl_run+0x552/0x16a0 arch/x86/kvm/x86.c:8756 vcpu_run arch/x86/kvm/x86.c:8534 [inline] kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 arch/x86/kvm/x86.c:8756 vcpu_run arch/x86/kvm/x86.c:8534 [inline] kvm_arch_vcpu_ioctl_run+0x3fb/0x16a0 arch/x86/kvm/x86.c:8756 kvm_vcpu_ioctl+0x493/0xe60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3138 kvm_get_dirty_log_protect.isra.0+0x670/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1465 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 ioctl_file_clone+0x180/0x180 fs/ioctl.c:245 set_irq_regs arch/x86/include/asm/irq_regs.h:27 [inline] smp_apic_timer_interrupt+0x1b6/0x600 arch/x86/kernel/apic/apic.c:1142 retint_kernel+0x2b/0x2b security_file_ioctl+0x78/0xb0 security/security.c:1460 security_file_ioctl+0x35/0xb0 security/security.c:1460 __read_once_size include/linux/compiler.h:199 [inline] check_kcov_mode kernel/kcov.c:155 [inline] __sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:187 kvm_get_dirty_log_protect.isra.0+0x670/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1465 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3