[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.472173][ T26] audit: type=1800 audit(1568218296.578:25): pid=8667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.519023][ T26] audit: type=1800 audit(1568218296.578:26): pid=8667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.547673][ T26] audit: type=1800 audit(1568218296.588:27): pid=8667 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 '10.128.0.145' (ECDSA) to the list of known hosts. syzkaller login: [ 82.372154][ T8821] IPVS: ftp: loaded support on port[0] = 21 [ 82.426427][ T8821] chnl_net:caif_netlink_parms(): no params data found [ 82.455294][ T8821] bridge0: port 1(bridge_slave_0) entered blocking state [ 82.462982][ T8821] bridge0: port 1(bridge_slave_0) entered disabled state [ 82.470994][ T8821] device bridge_slave_0 entered promiscuous mode [ 82.478918][ T8821] bridge0: port 2(bridge_slave_1) entered blocking state [ 82.486119][ T8821] bridge0: port 2(bridge_slave_1) entered disabled state [ 82.493804][ T8821] device bridge_slave_1 entered promiscuous mode [ 82.510346][ T8821] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 82.520747][ T8821] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 82.538814][ T8821] team0: Port device team_slave_0 added [ 82.547000][ T8821] team0: Port device team_slave_1 added [ 82.601612][ T8821] device hsr_slave_0 entered promiscuous mode [ 82.669597][ T8821] device hsr_slave_1 entered promiscuous mode [ 82.768135][ T8821] bridge0: port 2(bridge_slave_1) entered blocking state [ 82.775535][ T8821] bridge0: port 2(bridge_slave_1) entered forwarding state [ 82.783420][ T8821] bridge0: port 1(bridge_slave_0) entered blocking state [ 82.790512][ T8821] bridge0: port 1(bridge_slave_0) entered forwarding state [ 82.824311][ T8821] 8021q: adding VLAN 0 to HW filter on device bond0 [ 82.837026][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 82.848098][ T2999] bridge0: port 1(bridge_slave_0) entered disabled state [ 82.856803][ T2999] bridge0: port 2(bridge_slave_1) entered disabled state [ 82.864867][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 82.876840][ T8821] 8021q: adding VLAN 0 to HW filter on device team0 [ 82.887620][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 82.896374][ T3504] bridge0: port 1(bridge_slave_0) entered blocking state [ 82.903500][ T3504] bridge0: port 1(bridge_slave_0) entered forwarding state [ 82.921692][ T8823] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 82.930884][ T8823] bridge0: port 2(bridge_slave_1) entered blocking state [ 82.938050][ T8823] bridge0: port 2(bridge_slave_1) entered forwarding state [ 82.946493][ T8823] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 82.956626][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 82.967366][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 82.982579][ T8821] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 82.994098][ T8821] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 83.006648][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 83.016408][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 83.025066][ T2999] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 83.042582][ T8821] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 188.269187][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 188.275949][ C0] rcu: 0-...!: (1 GPs behind) idle=82a/1/0x4000000000000002 softirq=9460/9462 fqs=5 [ 188.285613][ C0] (t=10501 jiffies g=7309 q=89) [ 188.290539][ C0] rcu: rcu_preempt kthread starved for 10492 jiffies! g7309 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 188.301910][ C0] rcu: RCU grace-period kthread stack dump: [ 188.307808][ C0] rcu_preempt I29440 10 2 0x80004000 [ 188.314147][ C0] Call Trace: [ 188.317439][ C0] __schedule+0x76e/0x17a0 [ 188.321857][ C0] ? __sched_text_start+0x8/0x8 [ 188.326715][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 188.332518][ C0] ? schedule_timeout+0x47c/0xc50 [ 188.337531][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 188.342808][ C0] schedule+0xd9/0x260 [ 188.346866][ C0] schedule_timeout+0x486/0xc50 [ 188.351716][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 188.357598][ C0] ? usleep_range+0x170/0x170 [ 188.362259][ C0] ? trace_hardirqs_on+0x67/0x240 [ 188.367285][ C0] ? __kasan_check_read+0x11/0x20 [ 188.372311][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 188.377848][ C0] ? swake_up_one+0x60/0x60 [ 188.382355][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 188.387282][ C0] ? invoke_rcu_core+0x230/0x230 [ 188.392208][ C0] ? trace_hardirqs_on+0x67/0x240 [ 188.397229][ C0] ? __kasan_check_read+0x11/0x20 [ 188.402247][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 188.408479][ C0] ? __kthread_parkme+0x108/0x1c0 [ 188.413564][ C0] ? __kasan_check_read+0x11/0x20 [ 188.418575][ C0] kthread+0x361/0x430 [ 188.422629][ C0] ? invoke_rcu_core+0x230/0x230 [ 188.427564][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 188.433797][ C0] ret_from_fork+0x24/0x30 [ 188.438245][ C0] NMI backtrace for cpu 0 [ 188.442575][ C0] CPU: 0 PID: 2999 Comm: kworker/0:2 Not tainted 5.3.0-rc6-next-20190830 #75 [ 188.451313][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 188.461375][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 188.467337][ C0] Call Trace: [ 188.470606][ C0] [ 188.473446][ C0] dump_stack+0x172/0x1f0 [ 188.477765][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 188.482950][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 188.489181][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 188.494807][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 188.500784][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 188.506685][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 188.511788][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 188.517320][ C0] ? raise_softirq+0x138/0x340 [ 188.522075][ C0] update_process_times+0x2d/0x70 [ 188.527092][ C0] tick_sched_handle+0xa2/0x190 [ 188.531937][ C0] tick_sched_timer+0x53/0x140 [ 188.536685][ C0] __hrtimer_run_queues+0x364/0xe40 [ 188.541883][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 188.547168][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 188.553134][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 188.558840][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 188.564914][ C0] hrtimer_interrupt+0x314/0x770 [ 188.569849][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 188.575382][ C0] apic_timer_interrupt+0xf/0x20 [ 188.580309][ C0] [ 188.583242][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 188.589296][ C0] 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 [ 188.608885][ C0] RSP: 0018:ffff88809f29f3f0 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 [ 188.617282][ C0] RAX: ffff888096a30af8 RBX: ffff888096a30af8 RCX: ffffffff85cb6f79 [ 188.625239][ C0] RDX: 0000000000000000 RSI: ffffffff85cb6e06 RDI: ffff888096a30b00 [ 188.633197][ C0] RBP: ffff88809f29f448 R08: ffff88809f31a100 R09: fffffbfff14ed341 [ 188.641168][ C0] R10: ffff88809f31aab8 R11: ffff88809f31a100 R12: dffffc0000000000 [ 188.649167][ C0] R13: ffff888096a30800 R14: ffff888096a30b90 R15: ffff888096a30b90 [ 188.657143][ C0] ? hhf_dequeue+0x679/0xa20 [ 188.661743][ C0] ? hhf_dequeue+0x506/0xa20 [ 188.666319][ C0] ? hhf_dequeue+0x7a/0xa20 [ 188.670811][ C0] __qdisc_run+0x1e7/0x19d0 [ 188.675314][ C0] ? dev_queue_xmit+0x18/0x20 [ 188.679982][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 188.684994][ C0] ? __kasan_check_read+0x11/0x20 [ 188.690100][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 188.695372][ C0] ? ip6_finish_output2+0x1034/0x2550 [ 188.700753][ C0] ? __kasan_check_read+0x11/0x20 [ 188.705768][ C0] ? mark_held_locks+0xa4/0xf0 [ 188.710525][ C0] dev_queue_xmit+0x18/0x20 [ 188.715016][ C0] ? dev_queue_xmit+0x18/0x20 [ 188.719684][ C0] neigh_resolve_output+0x5a5/0x970 [ 188.724874][ C0] ip6_finish_output2+0x1034/0x2550 [ 188.730064][ C0] ? ip6_forward_finish+0x570/0x570 [ 188.735267][ C0] ? lock_downgrade+0x920/0x920 [ 188.740107][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 188.746347][ C0] ? __kasan_check_read+0x11/0x20 [ 188.751363][ C0] __ip6_finish_output+0x444/0xaa0 [ 188.756498][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 188.761773][ C0] ip6_finish_output+0x38/0x1f0 [ 188.766612][ C0] ip6_output+0x235/0x7f0 [ 188.770937][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 188.776036][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 188.781311][ C0] ndisc_send_skb+0xf29/0x14a0 [ 188.786064][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 188.791341][ C0] ? skb_set_owner_w+0x21b/0x320 [ 188.796294][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 188.802021][ C0] ndisc_send_ns+0x3a9/0x850 [ 188.806685][ C0] ? mark_held_locks+0xa4/0xf0 [ 188.811450][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 188.816634][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 188.822013][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 188.827401][ C0] ? trace_hardirqs_on+0x67/0x240 [ 188.832471][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 188.837667][ C0] addrconf_dad_work+0xb88/0x1150 [ 188.842684][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 188.848246][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 188.854209][ C0] ? trace_hardirqs_on+0x67/0x240 [ 188.859226][ C0] process_one_work+0x9af/0x1740 [ 188.864156][ C0] ? __schedule+0x776/0x17a0 [ 188.868754][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 188.874111][ C0] ? lock_acquire+0x190/0x410 [ 188.878793][ C0] worker_thread+0x98/0xe40 [ 188.883297][ C0] ? trace_hardirqs_on+0x67/0x240 [ 188.888313][ C0] kthread+0x361/0x430 [ 188.892384][ C0] ? process_one_work+0x1740/0x1740 [ 188.897581][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 188.903808][ C0] ret_from_fork+0x24/0x30