[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 66.310347][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 66.310357][ T26] audit: type=1800 audit(1568401168.646:29): pid=9867 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 66.352825][ T26] audit: type=1800 audit(1568401168.656:30): pid=9867 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. syzkaller login: [ 195.244514][T10018] IPVS: ftp: loaded support on port[0] = 21 [ 195.293871][T10018] chnl_net:caif_netlink_parms(): no params data found [ 195.317702][T10018] bridge0: port 1(bridge_slave_0) entered blocking state [ 195.325226][T10018] bridge0: port 1(bridge_slave_0) entered disabled state [ 195.333089][T10018] device bridge_slave_0 entered promiscuous mode [ 195.340379][T10018] bridge0: port 2(bridge_slave_1) entered blocking state [ 195.347565][T10018] bridge0: port 2(bridge_slave_1) entered disabled state [ 195.355223][T10018] device bridge_slave_1 entered promiscuous mode [ 195.368958][T10018] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 195.379540][T10018] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 195.396347][T10018] team0: Port device team_slave_0 added [ 195.403325][T10018] team0: Port device team_slave_1 added [ 195.483827][T10018] device hsr_slave_0 entered promiscuous mode [ 195.552453][T10018] device hsr_slave_1 entered promiscuous mode [ 195.618292][T10018] bridge0: port 2(bridge_slave_1) entered blocking state [ 195.625971][T10018] bridge0: port 2(bridge_slave_1) entered forwarding state [ 195.633315][T10018] bridge0: port 1(bridge_slave_0) entered blocking state [ 195.640476][T10018] bridge0: port 1(bridge_slave_0) entered forwarding state [ 195.665520][T10018] 8021q: adding VLAN 0 to HW filter on device bond0 [ 195.676343][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 195.695363][ T3516] bridge0: port 1(bridge_slave_0) entered disabled state [ 195.703108][ T3516] bridge0: port 2(bridge_slave_1) entered disabled state [ 195.710719][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 195.720852][T10018] 8021q: adding VLAN 0 to HW filter on device team0 [ 195.731747][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 195.740324][ T3009] bridge0: port 1(bridge_slave_0) entered blocking state [ 195.747570][ T3009] bridge0: port 1(bridge_slave_0) entered forwarding state [ 195.757774][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 195.766687][ T3516] bridge0: port 2(bridge_slave_1) entered blocking state [ 195.773937][ T3516] bridge0: port 2(bridge_slave_1) entered forwarding state [ 195.791803][T10018] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 195.802694][T10018] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 195.815252][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 195.823868][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 195.832455][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 195.840772][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 195.849381][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 195.857022][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 195.871271][T10018] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 300.962025][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 300.968757][ C0] rcu: 0-...!: (10499 ticks this GP) idle=732/1/0x4000000000000002 softirq=10220/10220 fqs=3 [ 300.979061][ C0] (t=10501 jiffies g=9649 q=26) [ 300.983999][ C0] rcu: rcu_preempt kthread starved for 10496 jiffies! g9649 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 300.995443][ C0] rcu: RCU grace-period kthread stack dump: [ 301.001413][ C0] rcu_preempt I29328 10 2 0x80004000 [ 301.007739][ C0] Call Trace: [ 301.011169][ C0] __schedule+0x755/0x1580 [ 301.015583][ C0] ? __sched_text_start+0x8/0x8 [ 301.020422][ C0] schedule+0xd9/0x260 [ 301.024496][ C0] schedule_timeout+0x486/0xc50 [ 301.029423][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 301.034352][ C0] ? usleep_range+0x170/0x170 [ 301.039117][ C0] ? trace_hardirqs_on+0x67/0x240 [ 301.044322][ C0] ? __kasan_check_read+0x11/0x20 [ 301.049411][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 301.054982][ C0] ? swake_up_one+0x60/0x60 [ 301.059510][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 301.064267][ C0] ? rcu_barrier+0x310/0x310 [ 301.068846][ C0] ? trace_hardirqs_on+0x67/0x240 [ 301.073869][ C0] ? __kasan_check_read+0x11/0x20 [ 301.078949][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 301.085221][ C0] ? __kthread_parkme+0x108/0x1c0 [ 301.090351][ C0] ? __kasan_check_read+0x11/0x20 [ 301.095370][ C0] kthread+0x361/0x430 [ 301.099432][ C0] ? rcu_barrier+0x310/0x310 [ 301.104016][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 301.110265][ C0] ret_from_fork+0x24/0x30 [ 301.114718][ C0] NMI backtrace for cpu 0 [ 301.119106][ C0] CPU: 0 PID: 10020 Comm: kworker/0:3 Not tainted 5.3.0-rc8+ #0 [ 301.126720][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 301.136852][ C0] Workqueue: events iterate_cleanup_work [ 301.142666][ C0] Call Trace: [ 301.145953][ C0] [ 301.148866][ C0] dump_stack+0x172/0x1f0 [ 301.153191][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 301.158384][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.164715][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 301.170348][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 301.176316][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 301.182373][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 301.187498][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 301.193104][ C0] ? raise_softirq+0x138/0x340 [ 301.197860][ C0] update_process_times+0x32/0x80 [ 301.202920][ C0] tick_sched_handle+0xa2/0x190 [ 301.207760][ C0] tick_sched_timer+0x53/0x140 [ 301.212512][ C0] __hrtimer_run_queues+0x364/0xe40 [ 301.217702][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 301.223022][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 301.228557][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 301.234278][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 301.240344][ C0] hrtimer_interrupt+0x314/0x770 [ 301.245339][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 301.250891][ C0] apic_timer_interrupt+0xf/0x20 [ 301.255892][ C0] RIP: 0010:__list_add_valid+0x17/0xa0 [ 301.261348][ C0] Code: ff ff e8 6c 48 6e fe eb 9e 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 49 89 fd 48 8d 7a 08 <41> 54 49 89 d4 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 75 52 [ 301.280951][ C0] RSP: 0018:ffff8880ae808f60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 301.289439][ C0] RAX: dffffc0000000000 RBX: ffff88808e5a30b8 RCX: ffffffff85c66051 [ 301.297510][ C0] RDX: ffff88808e5a3150 RSI: ffff88808e5a3150 RDI: ffff88808e5a3158 [ 301.305488][ C0] RBP: ffff8880ae808f68 R08: ffff8880933f20c0 R09: 0000000000000000 [ 301.313480][ C0] R10: fffffbfff134afaf R11: ffff8880933f20c0 R12: dffffc0000000000 [ 301.321811][ C0] R13: ffff88808e5a30b8 R14: ffff88808e5a3158 R15: ffff88808e5a3150 [ 301.329800][ C0] ? apic_timer_interrupt+0xa/0x20 [ 301.335000][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 301.340537][ C0] hhf_dequeue+0x66d/0xa20 [ 301.345054][ C0] __qdisc_run+0x1e7/0x19d0 [ 301.349619][ C0] ? dev_queue_xmit+0x18/0x20 [ 301.354287][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 301.359301][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 301.364662][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 301.370049][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 301.376522][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 301.381836][ C0] ? br_forward_finish+0x235/0x400 [ 301.386940][ C0] ? __kasan_check_read+0x11/0x20 [ 301.391950][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 301.397147][ C0] dev_queue_xmit+0x18/0x20 [ 301.401644][ C0] ? dev_queue_xmit+0x18/0x20 [ 301.406308][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 301.411730][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 301.416467][ C0] br_forward_finish+0xfa/0x400 [ 301.421321][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 301.427470][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 301.432230][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 301.437955][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 301.442629][ C0] __br_forward+0x641/0xb00 [ 301.447133][ C0] ? br_forward_finish+0x400/0x400 [ 301.452232][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 301.457842][ C0] deliver_clone+0x61/0xc0 [ 301.462246][ C0] maybe_deliver+0x2c7/0x390 [ 301.467701][ C0] br_flood+0x13a/0x3d0 [ 301.471924][ C0] br_dev_xmit+0x98c/0x15a0 [ 301.476421][ C0] ? br_poll_controller+0x10/0x10 [ 301.481448][ C0] ? netif_skb_features+0x6c2/0xb90 [ 301.486701][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 301.491982][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 301.498271][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 301.503457][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.509693][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 301.514820][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.521074][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 301.526182][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 301.531500][ C0] ? __ip6_finish_output+0x444/0xa50 [ 301.536791][ C0] ? __kasan_check_read+0x11/0x20 [ 301.541877][ C0] ? ipv6_chk_mcast_addr+0x315/0x6f0 [ 301.547172][ C0] ? lock_downgrade+0x920/0x920 [ 301.552023][ C0] ? lock_acquire+0x190/0x410 [ 301.556701][ C0] ? __ip6_finish_output+0x444/0xa50 [ 301.561978][ C0] dev_queue_xmit+0x18/0x20 [ 301.566482][ C0] ? dev_queue_xmit+0x18/0x20 [ 301.571430][ C0] ip6_finish_output2+0xf58/0x2520 [ 301.576539][ C0] ? ip6_forward_finish+0x530/0x530 [ 301.581793][ C0] ? ip6_mtu+0x16f/0x460 [ 301.586081][ C0] __ip6_finish_output+0x444/0xa50 [ 301.591175][ C0] ? __ip6_finish_output+0x444/0xa50 [ 301.596461][ C0] ip6_finish_output+0x38/0x1f0 [ 301.601414][ C0] ip6_output+0x235/0x7c0 [ 301.605733][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 301.610933][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 301.616212][ C0] ? icmp6_dst_alloc+0x432/0x660 [ 301.621165][ C0] mld_sendpack+0x9c7/0xea0 [ 301.625659][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 301.630945][ C0] ? mld_ifc_timer_expire+0x437/0x8a0 [ 301.636321][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 301.641878][ C0] mld_ifc_timer_expire+0x449/0x8a0 [ 301.647102][ C0] call_timer_fn+0x1ac/0x780 [ 301.651676][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 301.657058][ C0] ? msleep_interruptible+0x150/0x150 [ 301.662506][ C0] ? trace_hardirqs_on+0x67/0x240 [ 301.667524][ C0] ? __kasan_check_read+0x11/0x20 [ 301.672542][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 301.677900][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 301.683258][ C0] run_timer_softirq+0x697/0x17a0 [ 301.688371][ C0] ? add_timer+0x930/0x930 [ 301.692835][ C0] ? kvm_clock_read+0x18/0x30 [ 301.697582][ C0] ? kvm_sched_clock_read+0x9/0x20 [ 301.702736][ C0] ? sched_clock+0x2e/0x50 [ 301.707171][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 301.712095][ C0] ? kvm_clock_read+0x18/0x30 [ 301.716761][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.722999][ C0] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 301.728443][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.734681][ C0] __do_softirq+0x262/0x98c [ 301.739190][ C0] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 301.744746][ C0] do_softirq_own_stack+0x2a/0x40 [ 301.749751][ C0] [ 301.752681][ C0] do_softirq.part.0+0x11a/0x170 [ 301.757606][ C0] __local_bh_enable_ip+0x211/0x270 [ 301.762796][ C0] nf_ct_iterate_cleanup+0x217/0x4e0 [ 301.768176][ C0] ? nf_ct_alloc_hashtable+0x150/0x150 [ 301.773628][ C0] nf_ct_iterate_cleanup_net+0x133/0x190 [ 301.779249][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 301.786428][ C0] ? nf_ct_iterate_cleanup+0x4e0/0x4e0 [ 301.791881][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 301.799067][ C0] ? lock_acquire+0x190/0x410 [ 301.803779][ C0] ? process_one_work+0x8c1/0x1740 [ 301.808879][ C0] iterate_cleanup_work+0x4a/0xd7 [ 301.813912][ C0] process_one_work+0x9af/0x1740 [ 301.818840][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 301.824226][ C0] ? lock_acquire+0x190/0x410 [ 301.829191][ C0] worker_thread+0x98/0xe40 [ 301.833687][ C0] ? trace_hardirqs_on+0x67/0x240 [ 301.839141][ C0] kthread+0x361/0x430 [ 301.843198][ C0] ? process_one_work+0x1740/0x1740 [ 301.848556][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 301.854783][ C0] ret_from_fork+0x24/0x30