INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=3915, c=3914, q=442) All QSes seen, last rcu_preempt kthread activity 10497 (4294973958-4294963461), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 27952 10404 6357 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/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:unwind_next_frame+0xae5/0x17a0 arch/x86/kernel/unwind_orc.c:467 RSP: 0018:ffff8880aeb07670 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000015 RBX: ffff8880aeb07720 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880aeb07e20 RBP: 1ffff11015d60ed5 R08: ffffffff88ec6c84 R09: ffff8880aeb07d78 R10: ffff8880aeb07755 R11: 0000000000058071 R12: ffffffff88ec6c80 R13: ffff8880aeb07758 R14: ffff8880aeb07e28 R15: 0000000000000002 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 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 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552 dst_alloc+0xe6/0x190 net/core/dst.c:107 __ip6_dst_alloc+0x2e/0x50 net/ipv6/route.c:357 ip6_dst_alloc+0x2a/0x1d0 net/ipv6/route.c:370 icmp6_dst_alloc+0x155/0x580 net/ipv6/route.c:1766 ndisc_send_skb+0xc0f/0x11e0 net/ipv6/ndisc.c:463 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3765 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3997 RSP: 0018:ffff88803ef37aa0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2cd1 RBX: ffff88804c940200 RCX: 00000000492c5821 RDX: dffffc0000000000 RSI: ffff88804c940ad0 RDI: 0000000000000282 RBP: ffff8880838897f8 R08: 000000000000560d R09: ffffffff8a0878e8 R10: ffff88804c940ad0 R11: ffff88804c940200 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] lockref_put_or_lock+0x14/0x70 lib/lockref.c:143 fast_dput fs/dcache.c:697 [inline] dput.part.0+0x3a3/0x710 fs/dcache.c:818 dput+0x1b/0x30 fs/dcache.c:811 inode_doinit_with_dentry+0x91d/0xe30 security/selinux/hooks.c:1684 selinux_d_instantiate+0x23/0x30 security/selinux/hooks.c:5917 security_d_instantiate+0x54/0xd0 security/security.c:1261 d_instantiate+0x5a/0x90 fs/dcache.c:1876 __debugfs_create_file+0x15b/0x3c0 fs/debugfs/inode.c:368 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:622 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3298 [inline] kvm_dev_ioctl+0xd71/0x1480 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3321 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: 0033:0x45c889 RSP: 002b:00007f098e717c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f098e7186d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000391 R14: 00000000004c60bf R15: 000000000076bf0c rcu_preempt kthread starved for 10553 jiffies! g3915 c3914 f0x2 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