[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.353603][ T26] audit: type=1800 audit(1568377506.381:25): pid=8676 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.396089][ T26] audit: type=1800 audit(1568377506.381:26): pid=8676 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.443738][ T26] audit: type=1800 audit(1568377506.381:27): pid=8676 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 '10.128.0.199' (ECDSA) to the list of known hosts. syzkaller login: [ 135.790135][ T8831] IPVS: ftp: loaded support on port[0] = 21 [ 135.844269][ T8831] chnl_net:caif_netlink_parms(): no params data found [ 135.871615][ T8831] bridge0: port 1(bridge_slave_0) entered blocking state [ 135.879352][ T8831] bridge0: port 1(bridge_slave_0) entered disabled state [ 135.887790][ T8831] device bridge_slave_0 entered promiscuous mode [ 135.895533][ T8831] bridge0: port 2(bridge_slave_1) entered blocking state [ 135.902726][ T8831] bridge0: port 2(bridge_slave_1) entered disabled state [ 135.910668][ T8831] device bridge_slave_1 entered promiscuous mode [ 135.925784][ T8831] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 135.936774][ T8831] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 135.954194][ T8831] team0: Port device team_slave_0 added [ 135.962364][ T8831] team0: Port device team_slave_1 added [ 136.027926][ T8831] device hsr_slave_0 entered promiscuous mode [ 136.076645][ T8831] device hsr_slave_1 entered promiscuous mode [ 136.123812][ T8831] bridge0: port 2(bridge_slave_1) entered blocking state [ 136.131047][ T8831] bridge0: port 2(bridge_slave_1) entered forwarding state [ 136.138868][ T8831] bridge0: port 1(bridge_slave_0) entered blocking state [ 136.145905][ T8831] bridge0: port 1(bridge_slave_0) entered forwarding state [ 136.178240][ T8831] 8021q: adding VLAN 0 to HW filter on device bond0 [ 136.190611][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 136.211093][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 136.219967][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 136.228785][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 136.240213][ T8831] 8021q: adding VLAN 0 to HW filter on device team0 [ 136.250091][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 136.258965][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 136.266060][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 136.278921][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 136.287589][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 136.294614][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 136.311756][ T8833] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 136.320592][ T8833] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 136.329405][ T8833] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 136.339332][ T8835] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 136.351445][ T8831] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 136.362929][ T8831] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 136.371141][ T8835] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 136.389560][ T8831] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 241.446101][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 241.455016][ C0] rcu: 0-...!: (1 GPs behind) idle=9aa/1/0x4000000000000002 softirq=8851/8852 fqs=19 [ 241.465182][ C0] (t=10501 jiffies g=7277 q=63) [ 241.470126][ C0] rcu: rcu_preempt kthread starved for 10464 jiffies! g7277 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 241.481202][ C0] rcu: RCU grace-period kthread stack dump: [ 241.487073][ C0] rcu_preempt R running task 29320 10 2 0x80004000 [ 241.495991][ C0] Call Trace: [ 241.499455][ C0] __schedule+0x755/0x1580 [ 241.503893][ C0] ? __sched_text_start+0x8/0x8 [ 241.508802][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 241.514617][ C0] ? schedule_timeout+0x47c/0xc50 [ 241.519752][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 241.525051][ C0] schedule+0xd9/0x260 [ 241.529114][ C0] schedule_timeout+0x486/0xc50 [ 241.533955][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 241.539778][ C0] ? usleep_range+0x170/0x170 [ 241.544516][ C0] ? trace_hardirqs_on+0x67/0x240 [ 241.549567][ C0] ? __kasan_check_read+0x11/0x20 [ 241.554632][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 241.560191][ C0] ? swake_up_one+0x60/0x60 [ 241.564701][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 241.569453][ C0] ? rcu_barrier+0x310/0x310 [ 241.574991][ C0] ? trace_hardirqs_on+0x67/0x240 [ 241.580016][ C0] ? __kasan_check_read+0x11/0x20 [ 241.585226][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 241.591493][ C0] ? __kthread_parkme+0x108/0x1c0 [ 241.596512][ C0] ? __kasan_check_read+0x11/0x20 [ 241.601523][ C0] kthread+0x361/0x430 [ 241.605612][ C0] ? rcu_barrier+0x310/0x310 [ 241.610196][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 241.616429][ C0] ret_from_fork+0x24/0x30 [ 241.620920][ C0] NMI backtrace for cpu 0 [ 241.625287][ C0] CPU: 0 PID: 8833 Comm: kworker/0:3 Not tainted 5.3.0-rc7+ #0 [ 241.632841][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 241.643070][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 241.649088][ C0] Call Trace: [ 241.652366][ C0] [ 241.655296][ C0] dump_stack+0x172/0x1f0 [ 241.659897][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 241.665096][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 241.671435][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 241.677091][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 241.683076][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 241.688975][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 241.694106][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 241.699721][ C0] ? raise_softirq+0x138/0x340 [ 241.704488][ C0] update_process_times+0x32/0x80 [ 241.709781][ C0] tick_sched_handle+0xa2/0x190 [ 241.714641][ C0] tick_sched_timer+0x53/0x140 [ 241.719405][ C0] __hrtimer_run_queues+0x364/0xe40 [ 241.725255][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 241.730540][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 241.736070][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 241.741827][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 241.747910][ C0] hrtimer_interrupt+0x314/0x770 [ 241.752851][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 241.758396][ C0] apic_timer_interrupt+0xf/0x20 [ 241.763315][ C0] [ 241.766337][ C0] RIP: 0010:__list_del_entry_valid+0x10/0xf5 [ 241.772336][ C0] Code: 6e fe 48 8b 75 e8 eb 9f 48 89 f7 48 89 75 e8 e8 b6 52 6e fe 48 8b 75 e8 eb b2 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 <49> 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 80 3c 02 00 [ 241.791957][ C0] RSP: 0018:ffff8880888fed40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 241.800363][ C0] RAX: dffffc0000000000 RBX: ffff888093b910b8 RCX: ffffffff85c7dbb9 [ 241.808317][ C0] RDX: 0000000000000000 RSI: ffffffff85c7e086 RDI: ffff888093b910b8 [ 241.816446][ C0] RBP: ffff8880888fed48 R08: ffff88809819e000 R09: fffffbfff14e9555 [ 241.824416][ C0] R10: ffff88809819e9f8 R11: ffff88809819e000 R12: dffffc0000000000 [ 241.832382][ C0] R13: ffff888093b90dc0 R14: 0000000000000000 R15: 0000000000000000 [ 241.840450][ C0] ? hhf_dequeue+0xb9/0xa20 [ 241.845001][ C0] ? hhf_dequeue+0x586/0xa20 [ 241.849606][ C0] hhf_dequeue+0x5c5/0xa20 [ 241.854143][ C0] __qdisc_run+0x1e7/0x19d0 [ 241.858699][ C0] ? dev_queue_xmit+0x18/0x20 [ 241.863377][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 241.868400][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 241.873907][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 241.879219][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 241.885569][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 241.890885][ C0] ? br_forward_finish+0x235/0x400 [ 241.895985][ C0] ? find_held_lock+0x35/0x130 [ 241.900733][ C0] ? br_forward_finish+0x235/0x400 [ 241.905832][ C0] dev_queue_xmit+0x18/0x20 [ 241.910325][ C0] ? dev_queue_xmit+0x18/0x20 [ 241.914984][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 241.920339][ C0] ? __kasan_check_read+0x11/0x20 [ 241.925355][ C0] br_forward_finish+0xfa/0x400 [ 241.930191][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 241.935728][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 241.940472][ C0] ? __kasan_check_read+0x11/0x20 [ 241.945482][ C0] __br_forward+0x641/0xb00 [ 241.949969][ C0] ? br_forward_finish+0x400/0x400 [ 241.955062][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 241.960608][ C0] deliver_clone+0x61/0xc0 [ 241.965005][ C0] maybe_deliver+0x2c7/0x390 [ 241.969576][ C0] br_flood+0x13a/0x3d0 [ 241.973718][ C0] br_dev_xmit+0x98c/0x15a0 [ 241.978211][ C0] ? br_poll_controller+0x10/0x10 [ 241.983221][ C0] ? netif_skb_features+0x6c2/0xb90 [ 241.988405][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 241.994627][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 241.999722][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 242.004734][ C0] ? __kasan_check_read+0x11/0x20 [ 242.009751][ C0] ? __lock_acquire+0x1702/0x4c30 [ 242.014777][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 242.020082][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 242.025448][ C0] ? __kasan_check_read+0x11/0x20 [ 242.030451][ C0] ? mark_lock+0xc0/0x11e0 [ 242.034851][ C0] ? mark_held_locks+0xa4/0xf0 [ 242.039601][ C0] dev_queue_xmit+0x18/0x20 [ 242.044093][ C0] ? dev_queue_xmit+0x18/0x20 [ 242.048787][ C0] neigh_resolve_output+0x5a5/0x970 [ 242.053976][ C0] ip6_finish_output2+0x1034/0x2520 [ 242.059189][ C0] ? ip6_mtu+0x2e6/0x460 [ 242.063424][ C0] ? ip6_forward_finish+0x530/0x530 [ 242.068602][ C0] ? lock_downgrade+0x920/0x920 [ 242.073435][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 242.079657][ C0] ? __kasan_check_read+0x11/0x20 [ 242.084670][ C0] __ip6_finish_output+0x444/0xa50 [ 242.089766][ C0] ? __ip6_finish_output+0x444/0xa50 [ 242.095034][ C0] ip6_finish_output+0x38/0x1f0 [ 242.099865][ C0] ip6_output+0x235/0x7c0 [ 242.104191][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 242.109285][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 242.114554][ C0] ndisc_send_skb+0xf29/0x1450 [ 242.119312][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 242.125491][ C0] ? skb_set_owner_w+0x21b/0x320 [ 242.130412][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 242.136245][ C0] ndisc_send_ns+0x3a9/0x850 [ 242.140833][ C0] ? mark_held_locks+0xa4/0xf0 [ 242.145590][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 242.150775][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 242.156045][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 242.161227][ C0] ? trace_hardirqs_on+0x67/0x240 [ 242.166232][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 242.171426][ C0] addrconf_dad_work+0xb88/0x1150 [ 242.176439][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 242.182032][ C0] process_one_work+0x9af/0x1740 [ 242.186960][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 242.192320][ C0] ? lock_acquire+0x190/0x410 [ 242.196985][ C0] worker_thread+0x98/0xe40 [ 242.201467][ C0] ? trace_hardirqs_on+0x67/0x240 [ 242.206481][ C0] kthread+0x361/0x430 [ 242.210531][ C0] ? process_one_work+0x1740/0x1740 [ 242.215707][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 242.221932][ C0] ret_from_fork+0x24/0x30