[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.873061][ T26] audit: type=1800 audit(1568449523.048:25): pid=8620 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.909102][ T26] audit: type=1800 audit(1568449523.048:26): pid=8620 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.952958][ T26] audit: type=1800 audit(1568449523.058:27): pid=8620 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 '10.128.0.54' (ECDSA) to the list of known hosts. syzkaller login: [ 95.742021][ T8775] IPVS: ftp: loaded support on port[0] = 21 [ 95.796225][ T8775] chnl_net:caif_netlink_parms(): no params data found [ 95.824335][ T8775] bridge0: port 1(bridge_slave_0) entered blocking state [ 95.832142][ T8775] bridge0: port 1(bridge_slave_0) entered disabled state [ 95.840031][ T8775] device bridge_slave_0 entered promiscuous mode [ 95.848150][ T8775] bridge0: port 2(bridge_slave_1) entered blocking state [ 95.855600][ T8775] bridge0: port 2(bridge_slave_1) entered disabled state [ 95.863350][ T8775] device bridge_slave_1 entered promiscuous mode [ 95.879959][ T8775] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 95.890755][ T8775] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 95.909210][ T8775] team0: Port device team_slave_0 added [ 95.917191][ T8775] team0: Port device team_slave_1 added [ 95.972654][ T8775] device hsr_slave_0 entered promiscuous mode [ 96.011030][ T8775] device hsr_slave_1 entered promiscuous mode [ 96.069345][ T8775] bridge0: port 2(bridge_slave_1) entered blocking state [ 96.076790][ T8775] bridge0: port 2(bridge_slave_1) entered forwarding state [ 96.084754][ T8775] bridge0: port 1(bridge_slave_0) entered blocking state [ 96.091931][ T8775] bridge0: port 1(bridge_slave_0) entered forwarding state [ 96.126300][ T8775] 8021q: adding VLAN 0 to HW filter on device bond0 [ 96.138775][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 96.149744][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 96.158451][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 96.166687][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 96.179505][ T8775] 8021q: adding VLAN 0 to HW filter on device team0 [ 96.190046][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 96.198775][ T3503] bridge0: port 1(bridge_slave_0) entered blocking state [ 96.206135][ T3503] bridge0: port 1(bridge_slave_0) entered forwarding state [ 96.232109][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 96.242152][ T3503] bridge0: port 2(bridge_slave_1) entered blocking state [ 96.249568][ T3503] bridge0: port 2(bridge_slave_1) entered forwarding state [ 96.258525][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 96.267254][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 96.275720][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 96.284336][ T3503] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 96.294262][ T8775] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 96.303850][ T8779] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 96.322735][ T8775] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 201.390638][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 201.397372][ C1] rcu: 1-...!: (1 GPs behind) idle=3f2/0/0x3 softirq=8968/8969 fqs=1 [ 201.405883][ C1] (t=10500 jiffies g=7089 q=46) [ 201.410802][ C1] rcu: rcu_preempt kthread starved for 10498 jiffies! g7089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 201.422047][ C1] rcu: RCU grace-period kthread stack dump: [ 201.427920][ C1] rcu_preempt I29440 10 2 0x80004000 [ 201.434269][ C1] Call Trace: [ 201.437551][ C1] __schedule+0x76e/0x17a0 [ 201.441952][ C1] ? __sched_text_start+0x8/0x8 [ 201.446792][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 201.452578][ C1] ? schedule_timeout+0x47c/0xc50 [ 201.457587][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 201.462859][ C1] schedule+0xd9/0x260 [ 201.466909][ C1] schedule_timeout+0x486/0xc50 [ 201.471737][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 201.477523][ C1] ? usleep_range+0x170/0x170 [ 201.482178][ C1] ? trace_hardirqs_on+0x67/0x240 [ 201.487183][ C1] ? __kasan_check_read+0x11/0x20 [ 201.492194][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 201.497733][ C1] ? swake_up_one+0x60/0x60 [ 201.502224][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 201.506975][ C1] ? invoke_rcu_core+0x230/0x230 [ 201.511891][ C1] ? trace_hardirqs_on+0x67/0x240 [ 201.516902][ C1] ? __kasan_check_read+0x11/0x20 [ 201.521910][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 201.528130][ C1] ? __kthread_parkme+0x108/0x1c0 [ 201.533134][ C1] ? __kasan_check_read+0x11/0x20 [ 201.538140][ C1] kthread+0x361/0x430 [ 201.542200][ C1] ? invoke_rcu_core+0x230/0x230 [ 201.547117][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 201.553349][ C1] ret_from_fork+0x24/0x30 [ 201.557784][ C1] NMI backtrace for cpu 1 [ 201.562096][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc6-next-20190830 #75 [ 201.570392][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 201.580424][ C1] Call Trace: [ 201.583687][ C1] [ 201.586523][ C1] dump_stack+0x172/0x1f0 [ 201.590839][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 201.596019][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 201.602250][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 201.607870][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 201.613833][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 201.619703][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 201.624797][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 201.630331][ C1] ? raise_softirq+0x138/0x340 [ 201.635080][ C1] update_process_times+0x2d/0x70 [ 201.640092][ C1] tick_sched_handle+0xa2/0x190 [ 201.644923][ C1] tick_sched_timer+0x53/0x140 [ 201.649669][ C1] __hrtimer_run_queues+0x364/0xe40 [ 201.654849][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 201.660129][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 201.666087][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 201.671786][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 201.677846][ C1] hrtimer_interrupt+0x314/0x770 [ 201.682772][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 201.688298][ C1] apic_timer_interrupt+0xf/0x20 [ 201.693216][ C1] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x11/0x20 [ 201.700050][ C1] Code: bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe [ 201.719635][ C1] RSP: 0018:ffff8880ae9095b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 201.728025][ C1] RAX: 0000000000000000 RBX: ffff8880a0300af8 RCX: ffffffff85cb69b9 [ 201.735976][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 201.743927][ C1] RBP: ffff8880ae9095b8 R08: ffff8880a98d0340 R09: fffffbfff14ed341 [ 201.751879][ C1] R10: ffff8880a98d0ca8 R11: ffff8880a98d0340 R12: dffffc0000000000 [ 201.759830][ C1] R13: ffff8880a0300800 R14: ffff8880a0300b90 R15: 0000000000000000 [ 201.767789][ C1] ? apic_timer_interrupt+0xa/0x20 [ 201.772885][ C1] ? hhf_dequeue+0xb9/0xa20 [ 201.777373][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 201.783591][ C1] hhf_dequeue+0xb9/0xa20 [ 201.787908][ C1] __qdisc_run+0x1e7/0x19d0 [ 201.792395][ C1] ? dev_queue_xmit+0x18/0x20 [ 201.797056][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 201.802063][ C1] ? __kasan_check_read+0x11/0x20 [ 201.807068][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 201.812076][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 201.817343][ C1] ? __kasan_check_read+0x11/0x20 [ 201.822346][ C1] ? mark_lock+0xc2/0x1220 [ 201.826747][ C1] ? mark_held_locks+0xa4/0xf0 [ 201.831510][ C1] ? ip6_finish_output2+0xc40/0x2550 [ 201.836783][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 201.842047][ C1] ? ip6_finish_output2+0xc40/0x2550 [ 201.847325][ C1] dev_queue_xmit+0x18/0x20 [ 201.851812][ C1] ? dev_queue_xmit+0x18/0x20 [ 201.856472][ C1] ip6_finish_output2+0xf58/0x2550 [ 201.861569][ C1] ? ip6_forward_finish+0x570/0x570 [ 201.866747][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 201.872975][ C1] ? __kasan_check_read+0x11/0x20 [ 201.877985][ C1] __ip6_finish_output+0x444/0xaa0 [ 201.883073][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 201.888349][ C1] ip6_finish_output+0x38/0x1f0 [ 201.893181][ C1] ip6_output+0x235/0x7f0 [ 201.897501][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 201.902600][ C1] ? __ip6_finish_output+0xaa0/0xaa0 [ 201.907872][ C1] ? icmp6_dst_alloc+0x432/0x660 [ 201.912790][ C1] mld_sendpack+0x9c7/0xed0 [ 201.917279][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 201.922551][ C1] ? mld_ifc_timer_expire+0x437/0x8a0 [ 201.927902][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 201.936553][ C1] mld_ifc_timer_expire+0x449/0x8a0 [ 201.941732][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 201.947262][ C1] call_timer_fn+0x1ac/0x780 [ 201.951838][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 201.957189][ C1] ? msleep_interruptible+0x150/0x150 [ 201.962540][ C1] ? run_timer_softirq+0x6ae/0x17f0 [ 201.968071][ C1] ? trace_hardirqs_on+0x67/0x240 [ 201.973083][ C1] ? __kasan_check_read+0x11/0x20 [ 201.978086][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 201.983439][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 201.988793][ C1] run_timer_softirq+0x6c0/0x17f0 [ 201.993802][ C1] ? add_timer+0x930/0x930 [ 201.998197][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 202.004341][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 202.009865][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 202.015827][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 202.022052][ C1] __do_softirq+0x262/0x98c [ 202.026544][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 202.031389][ C1] irq_exit+0x19b/0x1e0 [ 202.035527][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 202.041054][ C1] apic_timer_interrupt+0xf/0x20 [ 202.045968][ C1] [ 202.048888][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 202.054241][ C1] Code: 38 c1 69 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 64 b8 64 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 54 b8 64 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e a7 1c fa e8 69 [ 202.073833][ C1] RSP: 0018:ffff8880a98dfcd0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 202.082254][ C1] RAX: 1ffffffff11e5db7 RBX: 0000000000000000 RCX: 0000000000000000 [ 202.090205][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98d0bdc [ 202.098156][ C1] RBP: ffff8880a98dfd00 R08: ffff8880a98d0340 R09: 0000000000000000 [ 202.106106][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 202.114056][ C1] R13: 0000000000000000 R14: 0000000000000060 R15: 0000000000000001 [ 202.122025][ C1] ? default_idle+0x4e/0x360 [ 202.126603][ C1] default_enter_idle+0x71/0xf0 [ 202.131435][ C1] cpuidle_enter_state+0xef/0xfb0 [ 202.136444][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 202.142669][ C1] cpuidle_enter+0x4f/0xa0 [ 202.147067][ C1] do_idle+0x45f/0x6e0 [ 202.151121][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 202.156134][ C1] ? do_idle+0x381/0x6e0 [ 202.160457][ C1] cpu_startup_entry+0x1b/0x20 [ 202.165202][ C1] start_secondary+0x2f4/0x410 [ 202.169948][ C1] ? set_cpu_sibling_map+0x2180/0x2180 [ 202.176392][ C1] secondary_startup_64+0xa4/0xb0