IPv6: ADDRCONF(NETDEV_UP): veth1_vlan: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready INFO: rcu_preempt self-detected stall on CPU 0-...: (10500 ticks this GP) idle=5da/140000000000002/0 softirq=21342/21342 fqs=0 (t=10500 jiffies g=1571 c=1570 q=963) rcu_preempt kthread starved for 10500 jiffies! g1571 c1570 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29824 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1746 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 0 CPU: 0 PID: 7543 Comm: syz-executor476 Not tainted 4.14.171-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+0x142/0x197 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 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:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 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+0x43d/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:ipv6_get_ifaddr+0x120/0x520 net/ipv6/addrconf.c:1916 RSP: 0018:ffff8880aec07bf0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000001 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff87045300 RDI: 0000000000000001 RBP: ffff8880aec07c50 R08: 0000000000000000 R09: ffff888082e18e48 R10: ffff888082e18e28 R11: ffff888082e18580 R12: ffff8880907b18b0 R13: ffff8880aec07cf0 R14: ffff8880934a0100 R15: ffffffff876225a0 ndisc_send_rs+0x17f/0x670 net/ipv6/ndisc.c:646 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x161/0x670 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+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:_raw_spin_lock+0x1/0x40 kernel/locking/spinlock.c:151 RSP: 0018:ffff888098597e80 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: ffff888082e18580 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8880a001a100 RBP: ffff888098597ec8 R08: 0000000300000000 R09: 0000000300000000 R10: 1ffff110130b2ff9 R11: 0000000000000000 R12: ffff8880a001a040 R13: 0000000000000003 R14: ffff8880a001a100 R15: ffff888082e18580 SYSC_close fs/open.c:1180 [inline] SyS_close+0x46/0xa0 fs/open.c:1178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x403a80 RSP: 002b:00007fff99e7dfb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000403a80 RDX: 00000000ffffffff RSI: 000000000000000d RDI: 0000000000000003 RBP: 0000000000045666 R08: 0000000300000000 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000404cb0 R14: 0000000000000000 R15: 0000000000000000 INFO: rcu_sched detected stalls on CPUs/tasks: 0-...: (0 ticks this GP) idle=5da/140000000000000/0 softirq=21343/21343 fqs=0 1-...: (1 GPs behind) idle=a42/140000000000002/0 softirq=13448/13450 fqs=0 (detected by 1, t=0 jiffies, g=1072, c=1071, q=10) IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready NMI backtrace for cpu 1 IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready CPU: 1 PID: 7545 Comm: syz-executor476 Not tainted 4.14.171-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+0x142/0x197 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 device veth1_macvtap entered promiscuous mode nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62 IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 print_other_cpu_stall kernel/rcu/tree.c:1485 [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+0x744/0xd0a kernel/rcu/tree.c:2792 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:debug_lockdep_rcu_enabled+0x0/0xa0 kernel/rcu/update.c:299 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! RSP: 0018:ffff8880aed070a0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2ce1 RBX: 0000000000000000 RCX: 000000001f88f75a RDX: dffffc0000000000 RSI: ffff88808bcd2f70 RDI: 0000000000000282 RBP: ffff8880aed070b8 R08: 0000000000000000 R09: ffff88808bcd2f90 R10: ffff88808bcd2f70 R11: ffff88808bcd2600 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88808bcd2600 R15: ffff8880aa810dc0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 kernel_text_address+0x73/0xf0 kernel/extable.c:150 __kernel_text_address+0xd/0x40 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_frame.c:18 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:13 __save_stack_trace+0x7b/0xd0 arch/x86/kernel/stacktrace.c:45 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready save_stack+0x45/0xd0 mm/kasan/kasan.c:447 batman_adv: batadv0: Interface activated: batadv_slave_0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready batman_adv: batadv0: Interface activated: batadv_slave_1 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x11b/0x780 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x5b8/0x8e0 lib/debugobjects.c:341 debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x274/0x450 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x35/0x820 kernel/rcu/tree.c:3050 call_rcu+0x12/0x20 kernel/rcu/tree_plugin.h:730 dst_release+0x5c/0x80 net/core/dst.c:188 refdst_drop include/net/dst.h:286 [inline] skb_dst_drop include/net/dst.h:298 [inline] __dev_queue_xmit+0x17e1/0x25e0 net/core/dev.c:3484 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_resolve_output net/core/neighbour.c:1369 [inline] neigh_resolve_output+0x4ff/0x8a0 net/core/neighbour.c:1349 neigh_output include/net/neighbour.h:500 [inline] ip6_finish_output2+0x9ab/0x21b0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x20f/0x6d0 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+0x12b/0x670 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x161/0x670 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+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 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+0x1ea/0x430 kernel/locking/lockdep.c:3997 RSP: 0018:ffff888097f7fcb0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2ce1 RBX: ffff88808bcd2600 RCX: 0000000002e305b3 RDX: dffffc0000000000 RSI: ffff88808bcd2ea8 RDI: 0000000000000282 RBP: ffff888097f7fcf8 R08: 00000000000036e7 R09: ffffffff8956afb8 R10: ffff88808bcd2ea8 R11: ffff88808bcd2600 R12: ffff8880a0fa4a88 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] fasync_remove_entry+0x28/0x200 fs/fcntl.c:861 fasync_helper+0x9c/0xa9 fs/fcntl.c:970 perf_fasync+0x87/0xc0 kernel/events/core.c:5529 __fput+0x5c4/0x7a0 fs/file_table.c:206 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x403a80 RSP: 002b:00007fff99e7dfb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000403a80 RDX: 00000000ffffffff RSI: 000000000000000d RDI: 0000000000000003 RBP: 0000000000045669 R08: 0000000100000000 R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000404cb0 R14: 0000000000000000 R15: 0000000000000000 device veth0_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready device veth0_vlan entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready device veth1_macvtap entered promiscuous mode device veth1_vlan entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready device veth0_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0