[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.821908][ T26] audit: type=1800 audit(1568516819.483:25): pid=8590 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.867382][ T26] audit: type=1800 audit(1568516819.483:26): pid=8590 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.903663][ T26] audit: type=1800 audit(1568516819.493:27): pid=8590 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 '10.128.0.139' (ECDSA) to the list of known hosts. syzkaller login: [ 408.913696][ T8747] IPVS: ftp: loaded support on port[0] = 21 [ 408.975020][ T8747] chnl_net:caif_netlink_parms(): no params data found [ 409.003371][ T8747] bridge0: port 1(bridge_slave_0) entered blocking state [ 409.011100][ T8747] bridge0: port 1(bridge_slave_0) entered disabled state [ 409.019036][ T8747] device bridge_slave_0 entered promiscuous mode [ 409.027430][ T8747] bridge0: port 2(bridge_slave_1) entered blocking state [ 409.034659][ T8747] bridge0: port 2(bridge_slave_1) entered disabled state [ 409.042449][ T8747] device bridge_slave_1 entered promiscuous mode [ 409.059332][ T8747] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 409.069979][ T8747] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 409.087714][ T8747] team0: Port device team_slave_0 added [ 409.095003][ T8747] team0: Port device team_slave_1 added [ 409.141145][ T8747] device hsr_slave_0 entered promiscuous mode [ 409.199446][ T8747] device hsr_slave_1 entered promiscuous mode [ 409.287541][ T8747] bridge0: port 2(bridge_slave_1) entered blocking state [ 409.294742][ T8747] bridge0: port 2(bridge_slave_1) entered forwarding state [ 409.302518][ T8747] bridge0: port 1(bridge_slave_0) entered blocking state [ 409.309629][ T8747] bridge0: port 1(bridge_slave_0) entered forwarding state [ 409.344353][ T8747] 8021q: adding VLAN 0 to HW filter on device bond0 [ 409.355491][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 409.375427][ T3706] bridge0: port 1(bridge_slave_0) entered disabled state [ 409.383732][ T3706] bridge0: port 2(bridge_slave_1) entered disabled state [ 409.393032][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 409.404064][ T8747] 8021q: adding VLAN 0 to HW filter on device team0 [ 409.415048][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 409.423586][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 409.430799][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 409.450892][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 409.459530][ T3706] bridge0: port 2(bridge_slave_1) entered blocking state [ 409.467022][ T3706] bridge0: port 2(bridge_slave_1) entered forwarding state [ 409.475229][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 409.483652][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 409.494401][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 409.502240][ T3706] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 409.513641][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 409.524396][ T8747] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 409.543656][ T8747] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 514.739092][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 514.745807][ C0] rcu: 0-...!: (10499 ticks this GP) idle=7f6/1/0x4000000000000002 softirq=9324/9324 fqs=8 [ 514.756078][ C0] (t=10501 jiffies g=7321 q=49) [ 514.761015][ C0] rcu: rcu_preempt kthread starved for 10486 jiffies! g7321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 514.772264][ C0] rcu: RCU grace-period kthread stack dump: [ 514.778131][ C0] rcu_preempt I29440 10 2 0x80004000 [ 514.784455][ C0] Call Trace: [ 514.787821][ C0] __schedule+0x76e/0x17a0 [ 514.792239][ C0] ? __sched_text_start+0x8/0x8 [ 514.797068][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 514.802874][ C0] ? schedule_timeout+0x47c/0xc50 [ 514.807878][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 514.813144][ C0] schedule+0xd9/0x260 [ 514.817197][ C0] schedule_timeout+0x486/0xc50 [ 514.822032][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 514.827823][ C0] ? usleep_range+0x170/0x170 [ 514.832481][ C0] ? trace_hardirqs_on+0x67/0x240 [ 514.837494][ C0] ? __kasan_check_read+0x11/0x20 [ 514.842513][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 514.848062][ C0] ? swake_up_one+0x60/0x60 [ 514.852566][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 514.857333][ C0] ? invoke_rcu_core+0x230/0x230 [ 514.862259][ C0] ? trace_hardirqs_on+0x67/0x240 [ 514.867279][ C0] ? __kasan_check_read+0x11/0x20 [ 514.872293][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 514.878548][ C0] ? __kthread_parkme+0x108/0x1c0 [ 514.883565][ C0] ? __kasan_check_read+0x11/0x20 [ 514.888586][ C0] kthread+0x361/0x430 [ 514.892652][ C0] ? invoke_rcu_core+0x230/0x230 [ 514.897580][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 514.903806][ C0] ret_from_fork+0x24/0x30 [ 514.908247][ C0] NMI backtrace for cpu 0 [ 514.912561][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc6-next-20190830 #75 [ 514.921127][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 514.931171][ C0] Call Trace: [ 514.934439][ C0] [ 514.937355][ C0] dump_stack+0x172/0x1f0 [ 514.941675][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 514.946858][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 514.953082][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 514.958695][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 514.964657][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 514.970530][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 514.975626][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 514.981168][ C0] ? raise_softirq+0x138/0x340 [ 514.985915][ C0] update_process_times+0x2d/0x70 [ 514.990917][ C0] tick_sched_handle+0xa2/0x190 [ 514.995756][ C0] tick_sched_timer+0x53/0x140 [ 515.000501][ C0] __hrtimer_run_queues+0x364/0xe40 [ 515.005683][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 515.010961][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 515.016930][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 515.022630][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 515.028689][ C0] hrtimer_interrupt+0x314/0x770 [ 515.033616][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 515.039142][ C0] apic_timer_interrupt+0xf/0x20 [ 515.044055][ C0] [ 515.046996][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 [ 515.053048][ C0] Code: 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 00 [ 515.072630][ C0] RSP: 0018:ffff8880a98ae998 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 515.081017][ C0] RAX: 0000000000000301 RBX: ffff8880a37aa2f8 RCX: ffffffff85cb6f79 [ 515.088968][ C0] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 [ 515.096922][ C0] RBP: ffff8880a98ae9f8 R08: ffff8880a989c240 R09: fffffbfff14ed341 [ 515.104873][ C0] R10: ffff8880a989cba8 R11: ffff8880a989c240 R12: dffffc0000000000 [ 515.112828][ C0] R13: ffff8880a37aa000 R14: ffff8880a37aa398 R15: ffff8880a37aa390 [ 515.120885][ C0] ? hhf_dequeue+0x679/0xa20 [ 515.125464][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 515.131685][ C0] ? hhf_dequeue+0x68b/0xa20 [ 515.136315][ C0] __qdisc_run+0x1e7/0x19d0 [ 515.140817][ C0] ? dev_queue_xmit+0x18/0x20 [ 515.145481][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 515.150492][ C0] ? process_backlog+0x206/0x750 [ 515.155419][ C0] ? net_rx_action+0x50a/0x10d0 [ 515.160252][ C0] ? __do_softirq+0x262/0x98c [ 515.164906][ C0] ? run_ksoftirqd+0x8e/0x110 [ 515.169578][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 515.174688][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 515.180001][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.186232][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.192366][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 515.197376][ C0] dev_queue_xmit+0x18/0x20 [ 515.201864][ C0] ? dev_queue_xmit+0x18/0x20 [ 515.206605][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 515.211994][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 515.216660][ C0] ? lock_downgrade+0x920/0x920 [ 515.221625][ C0] br_nf_dev_queue_xmit+0x34e/0x14b0 [ 515.226898][ C0] br_nf_post_routing+0x1502/0x1d30 [ 515.232080][ C0] ? br_nf_dev_queue_xmit+0x14b0/0x14b0 [ 515.237611][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 515.243405][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.249593][ C0] nf_hook_slow+0xbc/0x1e0 [ 515.254008][ C0] br_forward_finish+0x215/0x400 [ 515.258929][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 515.264454][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.270589][ C0] ? br_fdb_add.cold+0x83/0x83 [ 515.275335][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 515.281035][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 515.285614][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 515.290533][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 515.296060][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 515.301158][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 515.306693][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.312915][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 515.318792][ C0] br_nf_forward_finish+0x66c/0xa90 [ 515.323979][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 515.329511][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 515.334439][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 515.339710][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 515.344801][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.350938][ C0] nf_hook_slow+0xbc/0x1e0 [ 515.355337][ C0] __br_forward+0x393/0xb00 [ 515.359823][ C0] ? br_forward_finish+0x400/0x400 [ 515.364915][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 515.370446][ C0] deliver_clone+0x61/0xc0 [ 515.374843][ C0] br_flood+0x325/0x3d0 [ 515.378985][ C0] br_handle_frame_finish+0xb46/0x1670 [ 515.384427][ C0] ? br_handle_local_finish+0x20/0x20 [ 515.389781][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.395916][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 515.400922][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 515.406625][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 515.411220][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 515.416136][ C0] ? br_handle_local_finish+0x20/0x20 [ 515.421490][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 515.426582][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.432722][ C0] ? br_handle_local_finish+0x20/0x20 [ 515.438249][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 515.443254][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 515.449040][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 515.454925][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 515.460820][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 515.467040][ C0] ? br_handle_local_finish+0x20/0x20 [ 515.472403][ C0] ? __kasan_check_read+0x11/0x20 [ 515.477411][ C0] br_nf_pre_routing_ipv6+0x456/0x840 [ 515.482766][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 515.487772][ C0] ? br_nf_pre_routing+0x2360/0x2360 [ 515.493038][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.499270][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 515.505487][ C0] ? skb_pull_rcsum+0x155/0x300 [ 515.510333][ C0] br_nf_pre_routing+0x1743/0x2360 [ 515.515431][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 515.521327][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 515.527197][ C0] br_handle_frame+0x806/0x1340 [ 515.532057][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 515.537775][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 515.543923][ C0] ? br_handle_local_finish+0x20/0x20 [ 515.549286][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 515.555078][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.561301][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 515.567011][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 515.572630][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 515.578466][ C0] ? __kasan_check_read+0x11/0x20 [ 515.583494][ C0] ? do_xdp_generic+0x50/0x50 [ 515.588161][ C0] ? __kasan_check_read+0x11/0x20 [ 515.593195][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 515.598139][ C0] ? __kasan_check_read+0x11/0x20 [ 515.603164][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 515.608965][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 515.614931][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 515.620808][ C0] ? lock_acquire+0x190/0x410 [ 515.625468][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.631691][ C0] __netif_receive_skb+0x2c/0x1d0 [ 515.636701][ C0] process_backlog+0x206/0x750 [ 515.641453][ C0] ? net_rx_action+0x27d/0x10d0 [ 515.646287][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 515.651556][ C0] net_rx_action+0x50a/0x10d0 [ 515.656218][ C0] ? napi_busy_loop+0x970/0x970 [ 515.661051][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 515.666575][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 515.672539][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 515.678765][ C0] __do_softirq+0x262/0x98c [ 515.683269][ C0] ? takeover_tasklets+0x820/0x820 [ 515.688358][ C0] run_ksoftirqd+0x8e/0x110 [ 515.692851][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 515.697773][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 515.703993][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 515.710213][ C0] ? __kthread_parkme+0x108/0x1c0 [ 515.715216][ C0] ? __kasan_check_read+0x11/0x20 [ 515.720249][ C0] kthread+0x361/0x430 [ 515.724307][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 515.730535][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 515.736782][ C0] ret_from_fork+0x24/0x30