INFO: rcu_preempt self-detected stall on CPU 1-...: (1 GPs behind) idle=8ea/140000000000002/0 softirq=12410/12425 fqs=0 (t=10500 jiffies g=1927 c=1926 q=646) rcu_preempt kthread starved for 10500 jiffies! g1927 c1926 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29920 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 1 CPU: 1 PID: 7893 Comm: syz-executor.0 Not tainted 4.14.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:775 [inline] RIP: 0010:trace_net_dev_queue include/trace/events/net.h:120 [inline] RIP: 0010:__dev_queue_xmit+0x14a4/0x25c0 net/core/dev.c:3491 RSP: 0018:ffff8880aeb07750 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff87d842e0 RDI: 0000000000000282 RBP: ffff8880aeb078a0 R08: ffffffff84fed352 R09: 0000000000022295 R10: ffff8880538d6ec8 R11: ffff8880538d6580 R12: ffff88809ffcaa80 R13: ffff88807f4c45c0 R14: ffff888095434d40 R15: ffff88808b7682c0 neigh_connected_output+0x3a6/0x580 net/core/neighbour.c:1398 neigh_output include/net/neighbour.h:500 [inline] ip6_finish_output2+0x992/0x2150 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c9/0x650 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:__kernel_text_address+0x0/0x30 kernel/extable.c:104 RSP: 0018:ffff88805386f540 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff88805386f560 RCX: 0000000000000000 RDX: 1ffff1100a70deb5 RSI: ffff88805386f468 RDI: ffffffff86600086 RBP: ffff88805386f5a8 R08: 0000000000000001 R09: ffff88805386ff00 R10: ffff88805386f595 R11: 0000000000058071 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880538d6580 R15: ffff8880a911bc4f unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline] unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:250 __save_stack_trace+0x7b/0xd0 arch/x86/kernel/stacktrace.c:45 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc_track_caller+0x153/0x7b0 mm/slab.c:3735 memdup_user+0x22/0xa0 mm/util.c:164 msr_io+0xb1/0x1e0 arch/x86/kvm/x86.c:2790 kvm_arch_vcpu_ioctl+0xc79/0x32f0 arch/x86/kvm/x86.c:3744 kvm_vcpu_ioctl+0x7b3/0xc70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2813 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c6b7 RSP: 002b:00007f8955255ff8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c6b7 RDX: 00007f8955256000 RSI: 000000004008ae89 RDI: 0000000000000009 RBP: 00000000000001ff R08: 0000000000000090 R09: 0000000000000009 R10: 00000000000000b3 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000020fe7000 R14: 00000000004cded3 R15: 000000000076bf0c