[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.433365][ T26] audit: type=1800 audit(1568509434.663:25): pid=8627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.478149][ T26] audit: type=1800 audit(1568509434.663:26): pid=8627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.510909][ T26] audit: type=1800 audit(1568509434.663:27): pid=8627 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 '10.128.0.239' (ECDSA) to the list of known hosts. syzkaller login: [ 206.957489][ T8779] IPVS: ftp: loaded support on port[0] = 21 [ 207.024469][ T8779] chnl_net:caif_netlink_parms(): no params data found [ 207.053817][ T8779] bridge0: port 1(bridge_slave_0) entered blocking state [ 207.061871][ T8779] bridge0: port 1(bridge_slave_0) entered disabled state [ 207.071084][ T8779] device bridge_slave_0 entered promiscuous mode [ 207.080724][ T8779] bridge0: port 2(bridge_slave_1) entered blocking state [ 207.088410][ T8779] bridge0: port 2(bridge_slave_1) entered disabled state [ 207.096491][ T8779] device bridge_slave_1 entered promiscuous mode [ 207.115297][ T8779] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 207.126902][ T8779] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 207.146907][ T8779] team0: Port device team_slave_0 added [ 207.154703][ T8779] team0: Port device team_slave_1 added [ 207.211575][ T8779] device hsr_slave_0 entered promiscuous mode [ 207.250331][ T8779] device hsr_slave_1 entered promiscuous mode [ 207.297071][ T8779] bridge0: port 2(bridge_slave_1) entered blocking state [ 207.304343][ T8779] bridge0: port 2(bridge_slave_1) entered forwarding state [ 207.312860][ T8779] bridge0: port 1(bridge_slave_0) entered blocking state [ 207.319972][ T8779] bridge0: port 1(bridge_slave_0) entered forwarding state [ 207.355543][ T8779] 8021q: adding VLAN 0 to HW filter on device bond0 [ 207.366907][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 207.377710][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 207.386676][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 207.394904][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 207.407338][ T8779] 8021q: adding VLAN 0 to HW filter on device team0 [ 207.418604][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 207.427341][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 207.434585][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 207.451657][ T8782] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 207.460572][ T8782] bridge0: port 2(bridge_slave_1) entered blocking state [ 207.467784][ T8782] bridge0: port 2(bridge_slave_1) entered forwarding state [ 207.485196][ T8779] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 207.496717][ T8779] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 207.510446][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 207.519690][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 207.528120][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 207.537010][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 207.545474][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 207.553287][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 207.572239][ T8779] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 312.858821][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 312.867079][ C1] rcu: 1-...!: (1 GPs behind) idle=16e/1/0x4000000000000002 softirq=10129/10130 fqs=31 [ 312.877294][ C1] (t=10500 jiffies g=7397 q=9) [ 312.882135][ C1] rcu: rcu_preempt kthread starved for 10438 jiffies! g7397 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 312.893407][ C1] rcu: RCU grace-period kthread stack dump: [ 312.899279][ C1] rcu_preempt I29688 10 2 0x80004000 [ 312.905598][ C1] Call Trace: [ 312.908945][ C1] __schedule+0x755/0x1580 [ 312.913377][ C1] ? __sched_text_start+0x8/0x8 [ 312.918220][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 312.924115][ C1] ? schedule_timeout+0x47c/0xc50 [ 312.929124][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 312.934399][ C1] schedule+0xd9/0x260 [ 312.938459][ C1] schedule_timeout+0x486/0xc50 [ 312.943293][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 312.949118][ C1] ? usleep_range+0x170/0x170 [ 312.953797][ C1] ? trace_hardirqs_on+0x67/0x240 [ 312.958822][ C1] ? __kasan_check_read+0x11/0x20 [ 312.964034][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 312.969575][ C1] ? swake_up_one+0x60/0x60 [ 312.974071][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 312.978832][ C1] ? rcu_barrier+0x310/0x310 [ 312.983411][ C1] ? trace_hardirqs_on+0x67/0x240 [ 312.988625][ C1] ? __kasan_check_read+0x11/0x20 [ 312.994007][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 313.000237][ C1] ? __kthread_parkme+0x108/0x1c0 [ 313.005265][ C1] ? __kasan_check_read+0x11/0x20 [ 313.010299][ C1] kthread+0x361/0x430 [ 313.014967][ C1] ? rcu_barrier+0x310/0x310 [ 313.019543][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 313.025785][ C1] ret_from_fork+0x24/0x30 [ 313.030237][ C1] NMI backtrace for cpu 1 [ 313.034569][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc7+ #0 [ 313.041916][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 313.051955][ C1] Call Trace: [ 313.055232][ C1] [ 313.058128][ C1] dump_stack+0x172/0x1f0 [ 313.062448][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 313.067647][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.073893][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 313.079518][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 313.087227][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 313.093116][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 313.098217][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 313.103771][ C1] ? raise_softirq+0x138/0x340 [ 313.108526][ C1] update_process_times+0x32/0x80 [ 313.113687][ C1] tick_sched_handle+0xa2/0x190 [ 313.118548][ C1] tick_sched_timer+0x53/0x140 [ 313.123303][ C1] __hrtimer_run_queues+0x364/0xe40 [ 313.128499][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 313.133783][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 313.139319][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.145021][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 313.151081][ C1] hrtimer_interrupt+0x314/0x770 [ 313.156068][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 313.161604][ C1] apic_timer_interrupt+0xf/0x20 [ 313.166521][ C1] [ 313.169479][ C1] RIP: 0010:hhf_dequeue+0x5e7/0xa20 [ 313.174678][ C1] Code: 89 73 10 e8 fb 6d 76 fd 31 ff 41 89 c6 89 c6 e8 5f 92 aa fb 45 84 f6 74 63 e8 15 91 aa fb 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 f3 03 00 00 48 8d 7b 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 [ 313.194587][ C1] RSP: 0018:ffff8880a990e9a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 313.203432][ C1] RAX: 1ffff11011cfd587 RBX: ffff88808e7eac38 RCX: ffffffff85c7e431 [ 313.211498][ C1] RDX: 0000000000000100 RSI: ffffffff85c7e43b RDI: 0000000000000001 [ 313.219471][ C1] RBP: ffff8880a990e9f8 R08: ffff8880a98fa440 R09: fffffbfff14e9755 [ 313.227618][ C1] R10: ffff8880a98fad98 R11: ffff8880a98fa440 R12: dffffc0000000000 [ 313.235581][ C1] R13: ffff88808e7ea940 R14: 0000000000000001 R15: 0000000000000000 [ 313.243562][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 313.248144][ C1] ? hhf_dequeue+0x5db/0xa20 [ 313.252898][ C1] ? hhf_dequeue+0x5db/0xa20 [ 313.257539][ C1] __qdisc_run+0x1e7/0x19d0 [ 313.262064][ C1] ? dev_queue_xmit+0x18/0x20 [ 313.266732][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 313.271740][ C1] ? process_backlog+0x206/0x750 [ 313.276669][ C1] ? net_rx_action+0x4d6/0x1080 [ 313.281525][ C1] ? __do_softirq+0x262/0x98c [ 313.286193][ C1] ? run_ksoftirqd+0x8e/0x110 [ 313.290865][ C1] ? smpboot_thread_fn+0x6a3/0xa40 [ 313.295976][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 313.301308][ C1] ? __skb_ext_put+0xd9/0x210 [ 313.305974][ C1] dev_queue_xmit+0x18/0x20 [ 313.310460][ C1] ? dev_queue_xmit+0x18/0x20 [ 313.315167][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 313.320528][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 313.325200][ C1] ? lock_downgrade+0x920/0x920 [ 313.330118][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 313.335406][ C1] br_nf_post_routing+0x1502/0x1d30 [ 313.340644][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 313.346237][ C1] ? mark_held_locks+0xf0/0xf0 [ 313.350992][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 313.356805][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 313.362674][ C1] nf_hook_slow+0xbc/0x1e0 [ 313.367094][ C1] br_forward_finish+0x215/0x400 [ 313.372199][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.377732][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 313.382483][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.388185][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 313.392762][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 313.397807][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.403367][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 313.408503][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.414035][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.420261][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 313.426141][ C1] br_nf_forward_finish+0x66c/0xa90 [ 313.431348][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.436918][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 313.441854][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 313.447147][ C1] ? mark_held_locks+0xf0/0xf0 [ 313.451913][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 313.457014][ C1] ? __vlan_flush+0x120/0x120 [ 313.461683][ C1] nf_hook_slow+0xbc/0x1e0 [ 313.466089][ C1] __br_forward+0x393/0xb00 [ 313.470577][ C1] ? br_forward_finish+0x400/0x400 [ 313.475675][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.481234][ C1] deliver_clone+0x61/0xc0 [ 313.485644][ C1] br_flood+0x325/0x3d0 [ 313.489797][ C1] br_handle_frame_finish+0xb46/0x1670 [ 313.495245][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.500690][ C1] ? audit_alloc_mark+0x3d0/0x500 [ 313.505703][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.511409][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 313.516006][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 313.520930][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.526289][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 313.531385][ C1] ? find_held_lock+0x35/0x130 [ 313.536134][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.541490][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 313.547402][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 313.553281][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 313.559243][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.564601][ C1] ? __kasan_check_read+0x11/0x20 [ 313.569615][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 313.574980][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 313.579991][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 313.586127][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.592352][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 313.598589][ C1] ? skb_pull_rcsum+0x155/0x300 [ 313.603428][ C1] br_nf_pre_routing+0x1743/0x2355 [ 313.608529][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 313.614419][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 313.620295][ C1] br_handle_frame+0x806/0x133e [ 313.625142][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 313.630849][ C1] ? kfree_skb+0x10e/0x3c0 [ 313.635270][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.640630][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 313.646370][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 313.651994][ C1] ? __kasan_check_read+0x11/0x20 [ 313.657003][ C1] ? do_xdp_generic+0x50/0x50 [ 313.661664][ C1] ? __kasan_check_read+0x11/0x20 [ 313.666673][ C1] ? __lock_acquire+0x8a2/0x4c30 [ 313.671652][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 313.677124][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 313.683018][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 313.689044][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 313.694937][ C1] ? lock_acquire+0x190/0x410 [ 313.699600][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.705913][ C1] __netif_receive_skb+0x2c/0x1d0 [ 313.711061][ C1] process_backlog+0x206/0x750 [ 313.715834][ C1] ? net_rx_action+0x249/0x1080 [ 313.720674][ C1] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 313.725951][ C1] net_rx_action+0x4d6/0x1080 [ 313.730619][ C1] ? napi_busy_loop+0x970/0x970 [ 313.735452][ C1] ? sched_clock+0x2e/0x50 [ 313.739859][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.746099][ C1] __do_softirq+0x262/0x98c [ 313.750597][ C1] ? takeover_tasklets+0x820/0x820 [ 313.755692][ C1] run_ksoftirqd+0x8e/0x110 [ 313.760193][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 313.765119][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 313.771342][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 313.777612][ C1] ? __kthread_parkme+0x108/0x1c0 [ 313.782656][ C1] ? __kasan_check_read+0x11/0x20 [ 313.787679][ C1] kthread+0x361/0x430 [ 313.791735][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 313.797959][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 313.804284][ C1] ret_from_fork+0x24/0x30