[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.058885][ T26] audit: type=1800 audit(1568573104.101:25): pid=8957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.080532][ T26] audit: type=1800 audit(1568573104.111:26): pid=8957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.101632][ T26] audit: type=1800 audit(1568573104.111:27): pid=8957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. syzkaller login: [ 264.134844][ T9109] IPVS: ftp: loaded support on port[0] = 21 [ 264.190320][ T9109] chnl_net:caif_netlink_parms(): no params data found [ 264.218712][ T9109] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.227446][ T9109] bridge0: port 1(bridge_slave_0) entered disabled state [ 264.235928][ T9109] device bridge_slave_0 entered promiscuous mode [ 264.245145][ T9109] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.252559][ T9109] bridge0: port 2(bridge_slave_1) entered disabled state [ 264.261494][ T9109] device bridge_slave_1 entered promiscuous mode [ 264.279389][ T9109] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 264.290807][ T9109] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 264.311338][ T9109] team0: Port device team_slave_0 added [ 264.319124][ T9109] team0: Port device team_slave_1 added [ 264.384816][ T9109] device hsr_slave_0 entered promiscuous mode [ 264.422466][ T9109] device hsr_slave_1 entered promiscuous mode [ 264.471161][ T9109] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.478453][ T9109] bridge0: port 2(bridge_slave_1) entered forwarding state [ 264.486728][ T9109] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.493868][ T9109] bridge0: port 1(bridge_slave_0) entered forwarding state [ 264.531045][ T9109] 8021q: adding VLAN 0 to HW filter on device bond0 [ 264.544437][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 264.564403][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 264.573217][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 264.581210][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 264.593703][ T9109] 8021q: adding VLAN 0 to HW filter on device team0 [ 264.608371][ T9111] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 264.617885][ T9111] bridge0: port 1(bridge_slave_0) entered blocking state [ 264.625094][ T9111] bridge0: port 1(bridge_slave_0) entered forwarding state [ 264.636579][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 264.647502][ T3503] bridge0: port 2(bridge_slave_1) entered blocking state [ 264.654679][ T3503] bridge0: port 2(bridge_slave_1) entered forwarding state [ 264.674137][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 264.685577][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 264.695324][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 264.707914][ T9111] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 264.720607][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program executing program executing program executing program [ 264.729924][ T9109] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 264.748107][ T9109] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 369.851791][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 369.859113][ C0] rcu: 0-...!: (10499 ticks this GP) idle=4e2/1/0x4000000000000002 softirq=9513/9513 fqs=4 [ 369.869542][ C0] (t=10500 jiffies g=7737 q=119) [ 369.874568][ C0] rcu: rcu_preempt kthread starved for 10491 jiffies! g7737 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 369.888010][ C0] rcu: RCU grace-period kthread stack dump: [ 369.894146][ C0] rcu_preempt I29032 10 2 0x80004000 [ 369.900632][ C0] Call Trace: [ 369.904234][ C0] __schedule+0x76e/0x17a0 [ 369.908689][ C0] ? __sched_text_start+0x8/0x8 [ 369.913684][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 369.920150][ C0] ? schedule_timeout+0x47c/0xc50 [ 369.925227][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 369.930558][ C0] schedule+0xd9/0x260 [ 369.934631][ C0] schedule_timeout+0x486/0xc50 [ 369.939829][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 369.945947][ C0] ? usleep_range+0x170/0x170 [ 369.950849][ C0] ? trace_hardirqs_on+0x67/0x240 [ 369.956123][ C0] ? __kasan_check_read+0x11/0x20 [ 369.961157][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 369.966834][ C0] ? swake_up_one+0x60/0x60 [ 369.971710][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 369.976591][ C0] ? invoke_rcu_core+0x230/0x230 [ 369.981745][ C0] ? trace_hardirqs_on+0x67/0x240 [ 369.986853][ C0] ? __kasan_check_read+0x11/0x20 [ 369.991972][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 369.998298][ C0] ? __kthread_parkme+0x108/0x1c0 [ 370.003357][ C0] ? __kasan_check_read+0x11/0x20 [ 370.008474][ C0] kthread+0x361/0x430 [ 370.012560][ C0] ? invoke_rcu_core+0x230/0x230 [ 370.017492][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 370.023875][ C0] ret_from_fork+0x24/0x30 [ 370.028335][ C0] NMI backtrace for cpu 0 [ 370.032674][ C0] CPU: 0 PID: 9111 Comm: kworker/0:3 Not tainted 5.3.0-rc6-next-20190830 #75 [ 370.043131][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 370.053814][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 370.059945][ C0] Call Trace: [ 370.063224][ C0] [ 370.066152][ C0] dump_stack+0x172/0x1f0 [ 370.070606][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 370.077664][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.084866][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 370.091440][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 370.098014][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 370.104108][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 370.109408][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 370.114971][ C0] ? raise_softirq+0x138/0x340 [ 370.119756][ C0] update_process_times+0x2d/0x70 [ 370.125105][ C0] tick_sched_handle+0xa2/0x190 [ 370.130202][ C0] tick_sched_timer+0x53/0x140 [ 370.134986][ C0] __hrtimer_run_queues+0x364/0xe40 [ 370.140812][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 370.146106][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 370.152807][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 370.158796][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 370.165008][ C0] hrtimer_interrupt+0x314/0x770 [ 370.170161][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 370.175753][ C0] apic_timer_interrupt+0xf/0x20 [ 370.180880][ C0] [ 370.183824][ C0] RIP: 0010:__list_add_valid+0x2b/0xa0 [ 370.189439][ C0] Code: b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 49 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 <75> 52 49 8b 54 24 08 48 39 f2 0f 85 5a 01 00 00 48 b8 00 00 00 00 [ 370.209160][ C0] RSP: 0000:ffff888097816d30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 370.217570][ C0] RAX: dffffc0000000000 RBX: ffff88808e968af8 RCX: ffffffff85cb6ed1 [ 370.225541][ C0] RDX: 1ffff11011d2d173 RSI: ffff88808e968b90 RDI: ffff88808e968b98 [ 370.233618][ C0] RBP: ffff888097816d48 R08: ffff8880a2f94080 R09: fffffbfff14ed341 [ 370.241778][ C0] R10: ffff8880a2f94a88 R11: ffff8880a2f94080 R12: ffff88808e968b90 [ 370.249855][ C0] R13: ffff88808e968af8 R14: ffff88808e968b98 R15: ffff88808e968b90 [ 370.257928][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 370.262543][ C0] hhf_dequeue+0x66d/0xa20 [ 370.267095][ C0] __qdisc_run+0x1e7/0x19d0 [ 370.272168][ C0] ? dev_queue_xmit+0x18/0x20 [ 370.276939][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 370.281958][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 370.288106][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 370.293642][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 370.299975][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 370.305528][ C0] ? br_forward_finish+0x235/0x400 [ 370.310660][ C0] ? find_held_lock+0x35/0x130 [ 370.315872][ C0] ? br_forward_finish+0x235/0x400 [ 370.320982][ C0] dev_queue_xmit+0x18/0x20 [ 370.325477][ C0] ? dev_queue_xmit+0x18/0x20 [ 370.330163][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 370.335799][ C0] ? __kasan_check_read+0x11/0x20 [ 370.340840][ C0] br_forward_finish+0xfa/0x400 [ 370.345705][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 370.351259][ C0] ? br_fdb_add.cold+0x83/0x83 [ 370.356030][ C0] ? __kasan_check_read+0x11/0x20 [ 370.361064][ C0] __br_forward+0x641/0xb00 [ 370.365857][ C0] ? br_forward_finish+0x400/0x400 [ 370.370963][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 370.376501][ C0] deliver_clone+0x61/0xc0 [ 370.380904][ C0] maybe_deliver+0x2c7/0x390 [ 370.385488][ C0] br_flood+0x13a/0x3d0 [ 370.389692][ C0] br_dev_xmit+0x98c/0x15a0 [ 370.394285][ C0] ? br_poll_controller+0x10/0x10 [ 370.399305][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 370.405447][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 370.410999][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 370.417209][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.423995][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 370.429286][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.435677][ C0] __dev_queue_xmit+0x2b82/0x37c0 [ 370.440718][ C0] ? __kasan_check_read+0x11/0x20 [ 370.445727][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 370.450786][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 370.456067][ C0] ? ip6_finish_output2+0x1034/0x2550 [ 370.461568][ C0] ? __kasan_check_read+0x11/0x20 [ 370.466611][ C0] ? mark_lock+0xc2/0x1220 [ 370.471057][ C0] ? mark_held_locks+0xa4/0xf0 [ 370.476113][ C0] dev_queue_xmit+0x18/0x20 [ 370.480725][ C0] ? dev_queue_xmit+0x18/0x20 [ 370.485690][ C0] neigh_resolve_output+0x5a5/0x970 [ 370.491011][ C0] ip6_finish_output2+0x1034/0x2550 [ 370.496257][ C0] ? ip6_mtu+0x2e6/0x460 [ 370.500498][ C0] ? ip6_forward_finish+0x570/0x570 [ 370.505689][ C0] ? lock_downgrade+0x920/0x920 [ 370.510526][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 370.516823][ C0] ? __kasan_check_read+0x11/0x20 [ 370.521841][ C0] __ip6_finish_output+0x444/0xaa0 [ 370.526939][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 370.532211][ C0] ip6_finish_output+0x38/0x1f0 [ 370.537049][ C0] ip6_output+0x235/0x7f0 [ 370.541370][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 370.546480][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 370.551820][ C0] ndisc_send_skb+0xf29/0x14a0 [ 370.556580][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 370.561914][ C0] ? skb_set_owner_w+0x21b/0x320 [ 370.566858][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 370.572682][ C0] ndisc_send_ns+0x3a9/0x850 [ 370.577274][ C0] ? mark_held_locks+0xa4/0xf0 [ 370.582028][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 370.587214][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 370.592486][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 370.597686][ C0] ? trace_hardirqs_on+0x67/0x240 [ 370.602736][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 370.608144][ C0] addrconf_dad_work+0xb88/0x1150 [ 370.613557][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 370.619502][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 370.625554][ C0] ? trace_hardirqs_on+0x67/0x240 [ 370.630573][ C0] process_one_work+0x9af/0x1740 [ 370.635501][ C0] ? __schedule+0x776/0x17a0 [ 370.640099][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 370.645470][ C0] ? lock_acquire+0x190/0x410 [ 370.650145][ C0] worker_thread+0x98/0xe40 [ 370.654686][ C0] ? trace_hardirqs_on+0x67/0x240 [ 370.659714][ C0] kthread+0x361/0x430 [ 370.663769][ C0] ? process_one_work+0x1740/0x1740 [ 370.668961][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 370.675189][ C0] ret_from_fork+0x24/0x30