[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.397993][ T26] audit: type=1800 audit(1568589620.509:25): pid=8810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.452610][ T26] audit: type=1800 audit(1568589620.509:26): pid=8810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.510432][ T26] audit: type=1800 audit(1568589620.509:27): pid=8810 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 '10.128.1.49' (ECDSA) to the list of known hosts. syzkaller login: [ 70.092674][ T8967] IPVS: ftp: loaded support on port[0] = 21 [ 70.148805][ T8967] chnl_net:caif_netlink_parms(): no params data found [ 70.178462][ T8967] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.186685][ T8967] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.194825][ T8967] device bridge_slave_0 entered promiscuous mode [ 70.205407][ T8967] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.212528][ T8967] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.220697][ T8967] device bridge_slave_1 entered promiscuous mode [ 70.239272][ T8967] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 70.250488][ T8967] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 70.270843][ T8967] team0: Port device team_slave_0 added [ 70.279011][ T8967] team0: Port device team_slave_1 added [ 70.356089][ T8967] device hsr_slave_0 entered promiscuous mode [ 70.423652][ T8967] device hsr_slave_1 entered promiscuous mode [ 70.511902][ T8967] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.519272][ T8967] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.527374][ T8967] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.534495][ T8967] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.569890][ T8967] 8021q: adding VLAN 0 to HW filter on device bond0 [ 70.582604][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.593116][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.602389][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.610822][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 70.624058][ T8967] 8021q: adding VLAN 0 to HW filter on device team0 [ 70.636258][ T2822] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 70.644913][ T2822] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.651983][ T2822] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.675764][ T8971] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 70.684573][ T8971] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.691626][ T8971] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.700009][ T8971] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 70.710749][ T8971] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 70.719283][ T8971] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 70.728643][ T8971] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 70.739293][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 70.750433][ T8967] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 70.767934][ T8967] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 175.803200][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 175.809968][ C1] rcu: 1-...!: (10499 ticks this GP) idle=8da/1/0x4000000000000002 softirq=9623/9623 fqs=8 [ 175.820248][ C1] (t=10500 jiffies g=7433 q=48) [ 175.825174][ C1] rcu: rcu_preempt kthread starved for 10483 jiffies! g7433 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 175.836426][ C1] rcu: RCU grace-period kthread stack dump: [ 175.842301][ C1] rcu_preempt I29688 10 2 0x80004000 [ 175.848623][ C1] Call Trace: [ 175.851912][ C1] __schedule+0x755/0x1580 [ 175.856379][ C1] ? __sched_text_start+0x8/0x8 [ 175.861230][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 175.867023][ C1] ? schedule_timeout+0x47c/0xc50 [ 175.872042][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 175.877373][ C1] schedule+0xd9/0x260 [ 175.881442][ C1] schedule_timeout+0x486/0xc50 [ 175.886283][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 175.892078][ C1] ? usleep_range+0x170/0x170 [ 175.896750][ C1] ? trace_hardirqs_on+0x67/0x240 [ 175.901769][ C1] ? __kasan_check_read+0x11/0x20 [ 175.906782][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 175.912312][ C1] ? swake_up_one+0x60/0x60 [ 175.916803][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 175.921557][ C1] ? rcu_barrier+0x310/0x310 [ 175.926143][ C1] ? trace_hardirqs_on+0x67/0x240 [ 175.931150][ C1] ? __kasan_check_read+0x11/0x20 [ 175.936167][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 175.942390][ C1] ? __kthread_parkme+0x108/0x1c0 [ 175.947397][ C1] ? __kasan_check_read+0x11/0x20 [ 175.952406][ C1] kthread+0x361/0x430 [ 175.956459][ C1] ? rcu_barrier+0x310/0x310 [ 175.961034][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 175.967258][ C1] ret_from_fork+0x24/0x30 [ 175.971703][ C1] NMI backtrace for cpu 1 [ 175.976044][ C1] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0 [ 175.983388][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 175.993677][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 175.999645][ C1] Call Trace: [ 176.002911][ C1] [ 176.005755][ C1] dump_stack+0x172/0x1f0 [ 176.010074][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 176.015260][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.021487][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 176.027118][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 176.033083][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 176.039000][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 176.044128][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 176.049687][ C1] ? raise_softirq+0x138/0x340 [ 176.054466][ C1] update_process_times+0x32/0x80 [ 176.059499][ C1] tick_sched_handle+0xa2/0x190 [ 176.064340][ C1] tick_sched_timer+0x53/0x140 [ 176.069101][ C1] __hrtimer_run_queues+0x364/0xe40 [ 176.074288][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 176.079572][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 176.085104][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.090804][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 176.096857][ C1] hrtimer_interrupt+0x314/0x770 [ 176.101803][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 176.107331][ C1] apic_timer_interrupt+0xf/0x20 [ 176.112247][ C1] [ 176.115183][ C1] RIP: 0010:hhf_dequeue+0x697/0xa20 [ 176.120382][ C1] Code: 31 ff 89 c6 88 45 b0 e8 b7 91 aa fb 0f b6 75 b0 40 84 f6 0f 84 c6 f9 ff ff e8 65 90 aa fb 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 <0f> 85 08 03 00 00 48 89 d8 49 89 9d 98 03 00 00 48 c1 e8 03 42 80 [ 176.140015][ C1] RSP: 0018:ffff8880a9a46d58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 176.148468][ C1] RAX: 1ffff110148cbbd3 RBX: ffff8880a465ddf8 RCX: ffffffff85c7e4d9 [ 176.156439][ C1] RDX: 0000000000000000 RSI: ffffffff85c7e4eb RDI: 0000000000000001 [ 176.164397][ C1] RBP: ffff8880a9a46da8 R08: ffff8880a9a3c5c0 R09: fffffbfff14e9755 [ 176.172364][ C1] R10: ffff8880a9a3cfb8 R11: ffff8880a9a3c5c0 R12: dffffc0000000000 [ 176.180404][ C1] R13: ffff8880a465db00 R14: ffff8880a465de98 R15: ffff8880a465de90 [ 176.188468][ C1] ? hhf_dequeue+0x679/0xa20 [ 176.193042][ C1] ? hhf_dequeue+0x68b/0xa20 [ 176.197621][ C1] ? hhf_dequeue+0x68b/0xa20 [ 176.202204][ C1] __qdisc_run+0x1e7/0x19d0 [ 176.206744][ C1] ? dev_queue_xmit+0x18/0x20 [ 176.211424][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 176.216440][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 176.221809][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 176.227085][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 176.233319][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 176.238659][ C1] ? br_forward_finish+0x235/0x400 [ 176.243782][ C1] ? find_held_lock+0x35/0x130 [ 176.248533][ C1] ? br_forward_finish+0x235/0x400 [ 176.253650][ C1] dev_queue_xmit+0x18/0x20 [ 176.258139][ C1] ? dev_queue_xmit+0x18/0x20 [ 176.262815][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 176.268175][ C1] ? __kasan_check_read+0x11/0x20 [ 176.273189][ C1] br_forward_finish+0xfa/0x400 [ 176.278026][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 176.283562][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 176.288311][ C1] ? __kasan_check_read+0x11/0x20 [ 176.293329][ C1] __br_forward+0x641/0xb00 [ 176.297827][ C1] ? br_forward_finish+0x400/0x400 [ 176.302930][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 176.308506][ C1] deliver_clone+0x61/0xc0 [ 176.312935][ C1] maybe_deliver+0x2c7/0x390 [ 176.317536][ C1] br_flood+0x13a/0x3d0 [ 176.321695][ C1] br_dev_xmit+0x98c/0x15a0 [ 176.326186][ C1] ? br_poll_controller+0x10/0x10 [ 176.331197][ C1] ? netif_skb_features+0x6c2/0xb90 [ 176.336389][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.342621][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 176.347721][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 176.352733][ C1] ? __kasan_check_read+0x11/0x20 [ 176.357786][ C1] ? __lock_acquire+0x1702/0x4c30 [ 176.362814][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 176.368088][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 176.373451][ C1] ? __kasan_check_read+0x11/0x20 [ 176.378488][ C1] ? mark_lock+0xc0/0x11e0 [ 176.382926][ C1] ? mark_held_locks+0xa4/0xf0 [ 176.387701][ C1] dev_queue_xmit+0x18/0x20 [ 176.392197][ C1] ? dev_queue_xmit+0x18/0x20 [ 176.396862][ C1] neigh_resolve_output+0x5a5/0x970 [ 176.402098][ C1] ip6_finish_output2+0x1034/0x2520 [ 176.407301][ C1] ? ip6_mtu+0x2e6/0x460 [ 176.411537][ C1] ? ip6_forward_finish+0x530/0x530 [ 176.416722][ C1] ? lock_downgrade+0x920/0x920 [ 176.421564][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.427790][ C1] ? __kasan_check_read+0x11/0x20 [ 176.432803][ C1] __ip6_finish_output+0x444/0xa50 [ 176.437911][ C1] ? __ip6_finish_output+0x444/0xa50 [ 176.443188][ C1] ip6_finish_output+0x38/0x1f0 [ 176.448039][ C1] ip6_output+0x235/0x7c0 [ 176.452354][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 176.457458][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 176.462930][ C1] ndisc_send_skb+0xf29/0x1450 [ 176.467693][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 176.472971][ C1] ? skb_set_owner_w+0x21b/0x320 [ 176.477934][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.483640][ C1] ndisc_send_ns+0x3a9/0x850 [ 176.488231][ C1] ? mark_held_locks+0xa4/0xf0 [ 176.492993][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 176.498172][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 176.503442][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 176.508625][ C1] ? trace_hardirqs_on+0x67/0x240 [ 176.513888][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 176.519074][ C1] addrconf_dad_work+0xb88/0x1150 [ 176.524087][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 176.529628][ C1] process_one_work+0x9af/0x1740 [ 176.534565][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 176.539918][ C1] ? lock_acquire+0x190/0x410 [ 176.544587][ C1] worker_thread+0x98/0xe40 [ 176.549096][ C1] kthread+0x361/0x430 [ 176.553148][ C1] ? process_one_work+0x1740/0x1740 [ 176.558329][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 176.564571][ C1] ret_from_fork+0x24/0x30