rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=daa/1/0x4000000000000004 softirq=442360/442366 fqs=0 rcu: (t=30001 jiffies g=402921 q=434) NMI backtrace for cpu 1 CPU: 1 PID: 32651 Comm: syz-executor.0 Not tainted 5.1.0-rc7+ #97 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1223 print_cpu_stall kernel/rcu/tree.c:1360 [inline] check_cpu_stall kernel/rcu/tree.c:1434 [inline] rcu_pending kernel/rcu/tree.c:3103 [inline] rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:ffs arch/x86/include/asm/bitops.h:413 [inline] RIP: 0010:__do_softirq+0x227/0x95a kernel/softirq.c:281 Code: c7 c0 80 97 92 88 48 c1 e8 03 42 80 3c 38 00 0f 85 37 07 00 00 48 83 3d 66 95 52 01 00 0f 84 f4 05 00 00 fb 66 0f 1f 44 00 00 ff ff ff ff 48 c7 45 c8 00 91 80 88 0f bc 45 d4 83 c0 01 89 45 RSP: 0018:ffff8880ae907f10 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11252f0 RBX: ffff88809c82e340 RCX: 1ffff11013905d7c RDX: 0000000000000000 RSI: ffff88809c82ebe8 RDI: ffff88809c82ebbc RBP: ffff8880ae907f98 R08: ffff88809c82e340 R09: ffff88809c82ebe0 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808e1a7738 R13: 0000000000000025 R14: 0000000000000025 R15: dffffc0000000000 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0x114/0x1d0 arch/x86/kernel/irq.c:258 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:583 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_release+0x4c1/0xa00 kernel/locking/lockdep.c:4233 Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 28 03 00 00 48 83 3d ae 06 3b 07 00 0f 84 cf 01 00 00 48 8b bd 68 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 RSP: 0018:ffff88808e1a77e8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda RAX: 1ffffffff11252ee RBX: 1ffff11011c34f03 RCX: 1ffff11013905d76 RDX: dffffc0000000000 RSI: 1ffff11013905d82 RDI: 0000000000000286 RBP: ffff88808e1a78a0 R08: ffff88809c82e340 R09: 0000000000000003 R10: ffff88809c82ec10 R11: ffff88809c82e340 R12: ffff88809c82e340 R13: ffffffff819ace4b R14: ffffffff8a5c9a20 R15: ffff88808e1a7878 __might_fault mm/memory.c:4407 [inline] __might_fault+0x19e/0x1e0 mm/memory.c:4392 __copy_from_user include/linux/uaccess.h:69 [inline] kvm_read_guest_cached+0x1c2/0x410 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2102 kvm_lapic_sync_from_vapic+0x19f/0x780 arch/x86/kvm/lapic.c:2511 vcpu_enter_guest+0x2681/0x5ec0 arch/x86/kvm/x86.c:7956 vcpu_run arch/x86/kvm/x86.c:8014 [inline] kvm_arch_vcpu_ioctl_run+0x425/0x1750 arch/x86/kvm/x86.c:8214 kvm_vcpu_ioctl+0x4dc/0xf90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2683 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f42a76d6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f42a76d76d4 R13: 00000000004c1d42 R14: 00000000004d4550 R15: 00000000ffffffff