[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.696647][ T26] audit: type=1800 audit(1568528324.829:25): pid=8515 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.739800][ T26] audit: type=1800 audit(1568528324.839:26): pid=8515 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.779928][ T26] audit: type=1800 audit(1568528324.839:27): pid=8515 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 '10.128.0.183' (ECDSA) to the list of known hosts. syzkaller login: [ 193.207302][ T8671] IPVS: ftp: loaded support on port[0] = 21 [ 193.267227][ T8671] chnl_net:caif_netlink_parms(): no params data found [ 193.295328][ T8671] bridge0: port 1(bridge_slave_0) entered blocking state [ 193.303290][ T8671] bridge0: port 1(bridge_slave_0) entered disabled state [ 193.311752][ T8671] device bridge_slave_0 entered promiscuous mode [ 193.320045][ T8671] bridge0: port 2(bridge_slave_1) entered blocking state [ 193.327156][ T8671] bridge0: port 2(bridge_slave_1) entered disabled state [ 193.335286][ T8671] device bridge_slave_1 entered promiscuous mode [ 193.351297][ T8671] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 193.361540][ T8671] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 193.379547][ T8671] team0: Port device team_slave_0 added [ 193.386911][ T8671] team0: Port device team_slave_1 added [ 193.442108][ T8671] device hsr_slave_0 entered promiscuous mode [ 193.480066][ T8671] device hsr_slave_1 entered promiscuous mode [ 193.527567][ T8671] bridge0: port 2(bridge_slave_1) entered blocking state [ 193.534741][ T8671] bridge0: port 2(bridge_slave_1) entered forwarding state [ 193.542458][ T8671] bridge0: port 1(bridge_slave_0) entered blocking state [ 193.549546][ T8671] bridge0: port 1(bridge_slave_0) entered forwarding state [ 193.583165][ T8671] 8021q: adding VLAN 0 to HW filter on device bond0 [ 193.594416][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 193.614293][ T2998] bridge0: port 1(bridge_slave_0) entered disabled state [ 193.622584][ T2998] bridge0: port 2(bridge_slave_1) entered disabled state [ 193.632253][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 193.643930][ T8671] 8021q: adding VLAN 0 to HW filter on device team0 [ 193.654402][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 193.663200][ T3503] bridge0: port 1(bridge_slave_0) entered blocking state [ 193.670480][ T3503] bridge0: port 1(bridge_slave_0) entered forwarding state [ 193.680620][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 193.688958][ T2998] bridge0: port 2(bridge_slave_1) entered blocking state [ 193.696074][ T2998] bridge0: port 2(bridge_slave_1) entered forwarding state [ 193.717033][ T8671] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 193.727988][ T8671] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 193.742373][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 193.751334][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 193.759565][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 193.768380][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 193.776909][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 193.784612][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 193.801997][ T8671] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 298.999694][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 299.006479][ C1] rcu: 1-...!: (10500 ticks this GP) idle=4e6/1/0x4000000000000002 softirq=9137/9137 fqs=0 [ 299.016935][ C1] (t=10500 jiffies g=7237 q=35) [ 299.021863][ C1] rcu: rcu_preempt kthread starved for 10500 jiffies! g7237 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 299.033114][ C1] rcu: RCU grace-period kthread stack dump: [ 299.038985][ C1] rcu_preempt I29440 10 2 0x80004000 [ 299.045307][ C1] Call Trace: [ 299.048720][ C1] __schedule+0x76e/0x17a0 [ 299.053126][ C1] ? __sched_text_start+0x8/0x8 [ 299.057957][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 299.063744][ C1] ? schedule_timeout+0x47c/0xc50 [ 299.068824][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 299.074096][ C1] schedule+0xd9/0x260 [ 299.078149][ C1] schedule_timeout+0x486/0xc50 [ 299.082990][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 299.088796][ C1] ? usleep_range+0x170/0x170 [ 299.093502][ C1] ? trace_hardirqs_on+0x67/0x240 [ 299.098541][ C1] ? __kasan_check_read+0x11/0x20 [ 299.103573][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 299.109107][ C1] ? swake_up_one+0x60/0x60 [ 299.113639][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 299.118400][ C1] ? invoke_rcu_core+0x230/0x230 [ 299.123340][ C1] ? trace_hardirqs_on+0x67/0x240 [ 299.128346][ C1] ? __kasan_check_read+0x11/0x20 [ 299.133558][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 299.139853][ C1] ? __kthread_parkme+0x108/0x1c0 [ 299.144868][ C1] ? __kasan_check_read+0x11/0x20 [ 299.149878][ C1] kthread+0x361/0x430 [ 299.153940][ C1] ? invoke_rcu_core+0x230/0x230 [ 299.158860][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 299.165098][ C1] ret_from_fork+0x24/0x30 [ 299.169589][ C1] NMI backtrace for cpu 1 [ 299.173949][ C1] CPU: 1 PID: 2998 Comm: kworker/1:2 Not tainted 5.3.0-rc6-next-20190830 #75 [ 299.182681][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 299.192799][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 299.198759][ C1] Call Trace: [ 299.202043][ C1] [ 299.204918][ C1] dump_stack+0x172/0x1f0 [ 299.209238][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 299.214430][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 299.220701][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 299.226327][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 299.232291][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 299.238251][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 299.243349][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 299.248923][ C1] ? raise_softirq+0x138/0x340 [ 299.253675][ C1] update_process_times+0x2d/0x70 [ 299.258726][ C1] tick_sched_handle+0xa2/0x190 [ 299.263562][ C1] tick_sched_timer+0x53/0x140 [ 299.268308][ C1] __hrtimer_run_queues+0x364/0xe40 [ 299.273491][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 299.278764][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 299.284729][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 299.290441][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 299.296538][ C1] hrtimer_interrupt+0x314/0x770 [ 299.301476][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 299.307022][ C1] apic_timer_interrupt+0xf/0x20 [ 299.311946][ C1] [ 299.314881][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 299.320928][ C1] Code: 89 25 34 8c 3b 09 41 bc f4 ff ff ff e8 1d 8f e9 ff 48 c7 05 1e 8c 3b 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 e4 a7 8f 7e 81 e2 [ 299.340512][ C1] RSP: 0018:ffff88809f28ed50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 299.348907][ C1] RAX: 0000000000000000 RBX: ffff8880912a72f8 RCX: ffffffff85cb69b9 [ 299.357120][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 299.365072][ C1] RBP: ffff88809f28eda8 R08: ffff88809f2840c0 R09: fffffbfff14ed341 [ 299.373024][ C1] R10: ffff88809f284ac8 R11: ffff88809f2840c0 R12: dffffc0000000000 [ 299.380976][ C1] R13: ffff8880912a7000 R14: ffff8880912a7390 R15: 0000000000000000 [ 299.389031][ C1] ? hhf_dequeue+0xb9/0xa20 [ 299.393524][ C1] ? hhf_dequeue+0x537/0xa20 [ 299.398152][ C1] __qdisc_run+0x1e7/0x19d0 [ 299.402682][ C1] ? dev_queue_xmit+0x18/0x20 [ 299.407432][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 299.412470][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 299.418629][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 299.423902][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 299.430189][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 299.435507][ C1] ? br_forward_finish+0x235/0x400 [ 299.440607][ C1] ? find_held_lock+0x35/0x130 [ 299.445352][ C1] ? br_forward_finish+0x235/0x400 [ 299.450460][ C1] dev_queue_xmit+0x18/0x20 [ 299.454948][ C1] ? dev_queue_xmit+0x18/0x20 [ 299.459702][ C1] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 299.465057][ C1] ? __kasan_check_read+0x11/0x20 [ 299.470069][ C1] br_forward_finish+0xfa/0x400 [ 299.474911][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 299.480439][ C1] ? br_fdb_add.cold+0x83/0x83 [ 299.485190][ C1] ? __kasan_check_read+0x11/0x20 [ 299.490211][ C1] __br_forward+0x641/0xb00 [ 299.494760][ C1] ? br_forward_finish+0x400/0x400 [ 299.499856][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 299.505389][ C1] deliver_clone+0x61/0xc0 [ 299.509805][ C1] maybe_deliver+0x2c7/0x390 [ 299.514377][ C1] br_flood+0x13a/0x3d0 [ 299.518524][ C1] br_dev_xmit+0x98c/0x15a0 [ 299.523793][ C1] ? br_poll_controller+0x10/0x10 [ 299.528798][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 299.534943][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 299.540468][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 299.546433][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 299.552674][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 299.557770][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 299.564006][ C1] __dev_queue_xmit+0x2b82/0x37c0 [ 299.569024][ C1] ? __kasan_check_read+0x11/0x20 [ 299.574028][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 299.579036][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 299.584306][ C1] ? ip6_finish_output2+0x1034/0x2550 [ 299.589660][ C1] ? __kasan_check_read+0x11/0x20 [ 299.594762][ C1] ? mark_lock+0xc2/0x1220 [ 299.599167][ C1] ? mark_held_locks+0xa4/0xf0 [ 299.603918][ C1] dev_queue_xmit+0x18/0x20 [ 299.608402][ C1] ? dev_queue_xmit+0x18/0x20 [ 299.613123][ C1] neigh_resolve_output+0x5a5/0x970 [ 299.618312][ C1] ip6_finish_output2+0x1034/0x2550 [ 299.623492][ C1] ? ip6_mtu+0x2e6/0x460 [ 299.627721][ C1] ? ip6_forward_finish+0x570/0x570 [ 299.632902][ C1] ? lock_downgrade+0x920/0x920 [ 299.637743][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 299.643967][ C1] ? __kasan_check_read+0x11/0x20 [ 299.648986][ C1] __ip6_finish_output+0x444/0xaa0 [ 299.654088][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 299.659357][ C1] ip6_finish_output+0x38/0x1f0 [ 299.664190][ C1] ip6_output+0x235/0x7f0 [ 299.668511][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 299.673639][ C1] ? __ip6_finish_output+0xaa0/0xaa0 [ 299.678990][ C1] ndisc_send_skb+0xf29/0x14a0 [ 299.683744][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 299.689054][ C1] ? skb_set_owner_w+0x21b/0x320 [ 299.693977][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 299.699688][ C1] ndisc_send_ns+0x3a9/0x850 [ 299.704270][ C1] ? mark_held_locks+0xa4/0xf0 [ 299.709029][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 299.714206][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 299.719471][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 299.724663][ C1] ? trace_hardirqs_on+0x67/0x240 [ 299.729669][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 299.734855][ C1] addrconf_dad_work+0xb88/0x1150 [ 299.739867][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 299.745409][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 299.751370][ C1] ? trace_hardirqs_on+0x67/0x240 [ 299.756435][ C1] process_one_work+0x9af/0x1740 [ 299.761357][ C1] ? __schedule+0x776/0x17a0 [ 299.765937][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 299.771300][ C1] ? lock_acquire+0x190/0x410 [ 299.775977][ C1] worker_thread+0x98/0xe40 [ 299.780464][ C1] ? trace_hardirqs_on+0x67/0x240 [ 299.785478][ C1] kthread+0x361/0x430 [ 299.789531][ C1] ? process_one_work+0x1740/0x1740 [ 299.794708][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 299.800933][ C1] ret_from_fork+0x24/0x30