[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.289258][ T26] audit: type=1800 audit(1568438456.470:25): pid=8411 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.334070][ T26] audit: type=1800 audit(1568438456.470:26): pid=8411 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.366553][ T26] audit: type=1800 audit(1568438456.480:27): pid=8411 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 '10.128.0.155' (ECDSA) to the list of known hosts. syzkaller login: [ 355.775192][ T8566] IPVS: ftp: loaded support on port[0] = 21 [ 355.835744][ T8566] chnl_net:caif_netlink_parms(): no params data found [ 355.863908][ T8566] bridge0: port 1(bridge_slave_0) entered blocking state [ 355.871436][ T8566] bridge0: port 1(bridge_slave_0) entered disabled state [ 355.879262][ T8566] device bridge_slave_0 entered promiscuous mode [ 355.888204][ T8566] bridge0: port 2(bridge_slave_1) entered blocking state [ 355.895243][ T8566] bridge0: port 2(bridge_slave_1) entered disabled state [ 355.903134][ T8566] device bridge_slave_1 entered promiscuous mode [ 355.919360][ T8566] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 355.929854][ T8566] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 355.947729][ T8566] team0: Port device team_slave_0 added [ 355.954701][ T8566] team0: Port device team_slave_1 added [ 356.008780][ T8566] device hsr_slave_0 entered promiscuous mode [ 356.057057][ T8566] device hsr_slave_1 entered promiscuous mode [ 356.103946][ T8566] bridge0: port 2(bridge_slave_1) entered blocking state [ 356.111185][ T8566] bridge0: port 2(bridge_slave_1) entered forwarding state [ 356.118909][ T8566] bridge0: port 1(bridge_slave_0) entered blocking state [ 356.125984][ T8566] bridge0: port 1(bridge_slave_0) entered forwarding state [ 356.156997][ T8566] 8021q: adding VLAN 0 to HW filter on device bond0 [ 356.169892][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 356.191077][ T8568] bridge0: port 1(bridge_slave_0) entered disabled state [ 356.199674][ T8568] bridge0: port 2(bridge_slave_1) entered disabled state [ 356.208766][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 356.219841][ T8566] 8021q: adding VLAN 0 to HW filter on device team0 [ 356.230702][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 356.239369][ T3504] bridge0: port 1(bridge_slave_0) entered blocking state [ 356.246535][ T3504] bridge0: port 1(bridge_slave_0) entered forwarding state [ 356.269024][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 356.277857][ T8568] bridge0: port 2(bridge_slave_1) entered blocking state [ 356.284921][ T8568] bridge0: port 2(bridge_slave_1) entered forwarding state [ 356.294036][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 356.302716][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 356.311735][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 356.319951][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 356.328473][ T8568] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 356.338328][ T8566] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 356.357558][ T8566] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 461.396430][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 461.403148][ C0] rcu: 0-...!: (10499 ticks this GP) idle=9d2/1/0x4000000000000002 softirq=9503/9503 fqs=19 [ 461.413491][ C0] (t=10501 jiffies g=6921 q=84) [ 461.418419][ C0] rcu: rcu_preempt kthread starved for 10464 jiffies! g6921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 461.429666][ C0] rcu: RCU grace-period kthread stack dump: [ 461.435542][ C0] rcu_preempt I29440 10 2 0x80004000 [ 461.441851][ C0] Call Trace: [ 461.445200][ C0] __schedule+0x76e/0x17a0 [ 461.449603][ C0] ? __sched_text_start+0x8/0x8 [ 461.454432][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 461.460248][ C0] ? schedule_timeout+0x47c/0xc50 [ 461.465257][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 461.470525][ C0] schedule+0xd9/0x260 [ 461.474575][ C0] schedule_timeout+0x486/0xc50 [ 461.479405][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 461.485195][ C0] ? usleep_range+0x170/0x170 [ 461.489852][ C0] ? trace_hardirqs_on+0x67/0x240 [ 461.494856][ C0] ? __kasan_check_read+0x11/0x20 [ 461.499864][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 461.505394][ C0] ? swake_up_one+0x60/0x60 [ 461.509880][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 461.514627][ C0] ? invoke_rcu_core+0x230/0x230 [ 461.519553][ C0] ? trace_hardirqs_on+0x67/0x240 [ 461.524554][ C0] ? __kasan_check_read+0x11/0x20 [ 461.529564][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 461.535782][ C0] ? __kthread_parkme+0x108/0x1c0 [ 461.540792][ C0] ? __kasan_check_read+0x11/0x20 [ 461.545796][ C0] kthread+0x361/0x430 [ 461.549842][ C0] ? invoke_rcu_core+0x230/0x230 [ 461.554768][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 461.560993][ C0] ret_from_fork+0x24/0x30 [ 461.565433][ C0] NMI backtrace for cpu 0 [ 461.569747][ C0] CPU: 0 PID: 8568 Comm: kworker/0:1 Not tainted 5.3.0-rc6-next-20190830 #75 [ 461.578479][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 461.588590][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 461.594545][ C0] Call Trace: [ 461.597814][ C0] [ 461.600669][ C0] dump_stack+0x172/0x1f0 [ 461.604982][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 461.610175][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 461.616394][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 461.622010][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 461.627972][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 461.633852][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 461.638945][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 461.644472][ C0] ? raise_softirq+0x138/0x340 [ 461.649221][ C0] update_process_times+0x2d/0x70 [ 461.654227][ C0] tick_sched_handle+0xa2/0x190 [ 461.659055][ C0] tick_sched_timer+0x53/0x140 [ 461.663803][ C0] __hrtimer_run_queues+0x364/0xe40 [ 461.668981][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 461.674246][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 461.680210][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 461.685911][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 461.691962][ C0] hrtimer_interrupt+0x314/0x770 [ 461.696888][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 461.702413][ C0] apic_timer_interrupt+0xf/0x20 [ 461.707331][ C0] [ 461.710320][ C0] RIP: 0010:hhf_dequeue+0x686/0xa20 [ 461.715502][ C0] Code: 00 00 48 89 df 48 8b 55 c8 4c 89 fe e8 43 55 77 fd 31 ff 89 c6 88 45 b0 e8 d7 e7 a6 fb 0f b6 75 b0 40 84 f6 0f 84 c6 f9 ff ff 85 e6 a6 fb 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 08 03 00 [ 461.735085][ C0] RSP: 0018:ffff88809295ed58 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 461.743482][ C0] RAX: 0000000000000000 RBX: ffff8880a10d5af8 RCX: ffffffff85cb6f79 [ 461.751432][ C0] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 [ 461.759391][ C0] RBP: ffff88809295eda8 R08: ffff88809b1de2c0 R09: fffffbfff14ed341 [ 461.767351][ C0] R10: ffff88809b1decc8 R11: ffff88809b1de2c0 R12: dffffc0000000000 [ 461.775303][ C0] R13: ffff8880a10d5800 R14: ffff8880a10d5b98 R15: ffff8880a10d5b90 [ 461.783270][ C0] ? hhf_dequeue+0x679/0xa20 [ 461.787844][ C0] ? hhf_dequeue+0x679/0xa20 [ 461.792473][ C0] __qdisc_run+0x1e7/0x19d0 [ 461.796984][ C0] ? dev_queue_xmit+0x18/0x20 [ 461.801992][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 461.807002][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 461.813149][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 461.818420][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 461.824698][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 461.829993][ C0] ? br_forward_finish+0x235/0x400 [ 461.835094][ C0] ? find_held_lock+0x35/0x130 [ 461.839923][ C0] ? br_forward_finish+0x235/0x400 [ 461.845019][ C0] dev_queue_xmit+0x18/0x20 [ 461.849500][ C0] ? dev_queue_xmit+0x18/0x20 [ 461.854158][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 461.859507][ C0] ? __kasan_check_read+0x11/0x20 [ 461.864533][ C0] br_forward_finish+0xfa/0x400 [ 461.869363][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 461.874889][ C0] ? br_fdb_add.cold+0x83/0x83 [ 461.879634][ C0] ? __kasan_check_read+0x11/0x20 [ 461.884638][ C0] __br_forward+0x641/0xb00 [ 461.889152][ C0] ? br_forward_finish+0x400/0x400 [ 461.894252][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 461.900043][ C0] deliver_clone+0x61/0xc0 [ 461.904441][ C0] maybe_deliver+0x2c7/0x390 [ 461.909022][ C0] br_flood+0x13a/0x3d0 [ 461.913162][ C0] br_dev_xmit+0x98c/0x15a0 [ 461.917651][ C0] ? br_poll_controller+0x10/0x10 [ 461.922656][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 461.928793][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 461.934329][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 461.940291][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 461.946513][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 461.951609][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 461.957831][ C0] __dev_queue_xmit+0x2b82/0x37c0 [ 461.962853][ C0] ? __kasan_check_read+0x11/0x20 [ 461.967861][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 461.972890][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 461.978161][ C0] ? ip6_finish_output2+0x1034/0x2550 [ 461.983524][ C0] ? __kasan_check_read+0x11/0x20 [ 461.988531][ C0] ? mark_lock+0xc2/0x1220 [ 461.992935][ C0] ? mark_held_locks+0xa4/0xf0 [ 461.997689][ C0] dev_queue_xmit+0x18/0x20 [ 462.002174][ C0] ? dev_queue_xmit+0x18/0x20 [ 462.006887][ C0] neigh_resolve_output+0x5a5/0x970 [ 462.012075][ C0] ip6_finish_output2+0x1034/0x2550 [ 462.017277][ C0] ? ip6_forward_finish+0x570/0x570 [ 462.022460][ C0] ? lock_downgrade+0x920/0x920 [ 462.027295][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 462.033526][ C0] ? __kasan_check_read+0x11/0x20 [ 462.038542][ C0] __ip6_finish_output+0x444/0xaa0 [ 462.043646][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 462.048916][ C0] ip6_finish_output+0x38/0x1f0 [ 462.053751][ C0] ip6_output+0x235/0x7f0 [ 462.058064][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 462.063161][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 462.068489][ C0] ndisc_send_skb+0xf29/0x14a0 [ 462.073255][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 462.078571][ C0] ? skb_set_owner_w+0x21b/0x320 [ 462.083495][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 462.089369][ C0] ndisc_send_ns+0x3a9/0x850 [ 462.093940][ C0] ? mark_held_locks+0xa4/0xf0 [ 462.098697][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 462.103872][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 462.109136][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 462.114313][ C0] ? trace_hardirqs_on+0x67/0x240 [ 462.119317][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 462.124510][ C0] addrconf_dad_work+0xb88/0x1150 [ 462.129520][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 462.135053][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 462.141023][ C0] ? trace_hardirqs_on+0x67/0x240 [ 462.146040][ C0] process_one_work+0x9af/0x1740 [ 462.150956][ C0] ? __schedule+0x776/0x17a0 [ 462.155530][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 462.160878][ C0] ? lock_acquire+0x190/0x410 [ 462.165542][ C0] worker_thread+0x98/0xe40 [ 462.170025][ C0] ? trace_hardirqs_on+0x67/0x240 [ 462.175046][ C0] kthread+0x361/0x430 [ 462.179095][ C0] ? process_one_work+0x1740/0x1740 [ 462.184290][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 462.190510][ C0] ret_from_fork+0x24/0x30