[....] 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. [ 61.515455][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 61.515465][ T26] audit: type=1800 audit(1568315607.289:29): pid=9611 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 [ 61.541665][ T26] audit: type=1800 audit(1568315607.289:30): pid=9611 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 '10.128.0.110' (ECDSA) to the list of known hosts. syzkaller login: [ 72.536180][ T9762] IPVS: ftp: loaded support on port[0] = 21 [ 72.576316][ T9762] chnl_net:caif_netlink_parms(): no params data found [ 72.599555][ T9762] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.606788][ T9762] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.614294][ T9762] device bridge_slave_0 entered promiscuous mode [ 72.621564][ T9762] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.628797][ T9762] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.636269][ T9762] device bridge_slave_1 entered promiscuous mode [ 72.650151][ T9762] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.660300][ T9762] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.675337][ T9762] team0: Port device team_slave_0 added [ 72.682170][ T9762] team0: Port device team_slave_1 added [ 72.738534][ T9762] device hsr_slave_0 entered promiscuous mode [ 72.776992][ T9762] device hsr_slave_1 entered promiscuous mode [ 72.821640][ T9762] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.828735][ T9762] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.836043][ T9762] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.843134][ T9762] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.868173][ T9762] 8021q: adding VLAN 0 to HW filter on device bond0 [ 72.879269][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 72.897646][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.905226][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.913199][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 72.923013][ T9762] 8021q: adding VLAN 0 to HW filter on device team0 [ 72.931967][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 72.940377][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.947422][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.957750][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 72.966021][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.973112][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.986067][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 72.995099][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.009283][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 73.017559][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.025570][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.034774][ T9762] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.049402][ T9762] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 178.096621][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 178.103266][ C0] rcu: 0-...!: (1 GPs behind) idle=a52/0/0x3 softirq=8899/8900 fqs=17 [ 178.111565][ C0] (t=10500 jiffies g=8985 q=88) [ 178.116485][ C0] rcu: rcu_preempt kthread starved for 10466 jiffies! g8985 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 178.127729][ C0] rcu: RCU grace-period kthread stack dump: [ 178.133595][ C0] rcu_preempt I29688 10 2 0x80004000 [ 178.139908][ C0] Call Trace: [ 178.143183][ C0] __schedule+0x755/0x1580 [ 178.147581][ C0] ? __sched_text_start+0x8/0x8 [ 178.152418][ C0] schedule+0xd9/0x260 [ 178.156468][ C0] schedule_timeout+0x486/0xc50 [ 178.161296][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 178.166209][ C0] ? usleep_range+0x170/0x170 [ 178.170874][ C0] ? trace_hardirqs_on+0x67/0x240 [ 178.175876][ C0] ? __kasan_check_read+0x11/0x20 [ 178.180881][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 178.186407][ C0] ? swake_up_one+0x60/0x60 [ 178.190911][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 178.195663][ C0] ? rcu_barrier+0x310/0x310 [ 178.200231][ C0] ? trace_hardirqs_on+0x67/0x240 [ 178.205231][ C0] ? __kasan_check_read+0x11/0x20 [ 178.210248][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 178.216466][ C0] ? __kthread_parkme+0x108/0x1c0 [ 178.221466][ C0] ? __kasan_check_read+0x11/0x20 [ 178.226481][ C0] kthread+0x361/0x430 [ 178.230527][ C0] ? rcu_barrier+0x310/0x310 [ 178.235093][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 178.241327][ C0] ret_from_fork+0x24/0x30 [ 178.245747][ C0] NMI backtrace for cpu 0 [ 178.250058][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc8+ #0 [ 178.257136][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 178.267163][ C0] Call Trace: [ 178.270423][ C0] [ 178.273251][ C0] dump_stack+0x172/0x1f0 [ 178.277566][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 178.282754][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 178.288986][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 178.294596][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 178.300554][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 178.306438][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 178.311528][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 178.317052][ C0] ? raise_softirq+0x138/0x340 [ 178.321814][ C0] update_process_times+0x32/0x80 [ 178.326817][ C0] tick_sched_handle+0xa2/0x190 [ 178.331660][ C0] tick_sched_timer+0x53/0x140 [ 178.336404][ C0] __hrtimer_run_queues+0x364/0xe40 [ 178.341581][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 178.346845][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 178.352369][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 178.358075][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 178.364119][ C0] hrtimer_interrupt+0x314/0x770 [ 178.369041][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 178.374578][ C0] apic_timer_interrupt+0xf/0x20 [ 178.379496][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x9/0x20 [ 178.386256][ C0] Code: 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6 fe ff ff 5d c3 0f 1f 40 [ 178.405860][ C0] RSP: 0018:ffff8880ae8095b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 178.414259][ C0] RAX: 0000000000000001 RBX: ffff888092b3ac38 RCX: ffffffff85c65b39 [ 178.422214][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 [ 178.430165][ C0] RBP: ffff8880ae809618 R08: ffffffff88c7a1c0 R09: 0000000000000000 [ 178.438374][ C0] R10: fffffbfff134afaf R11: ffffffff88c7a1c0 R12: dffffc0000000000 [ 178.446322][ C0] R13: ffff888092b3a940 R14: 0000000000000001 R15: 0000000000000000 [ 178.454283][ C0] ? apic_timer_interrupt+0xa/0x20 [ 178.459377][ C0] ? hhf_dequeue+0xb9/0xa20 [ 178.463861][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 178.468434][ C0] __qdisc_run+0x1e7/0x19d0 [ 178.472918][ C0] ? dev_queue_xmit+0x18/0x20 [ 178.477573][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 178.482581][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 178.487847][ C0] ? __ip6_finish_output+0x444/0xa50 [ 178.493109][ C0] ? ipv6_chk_mcast_addr+0x315/0x6f0 [ 178.498373][ C0] ? lock_downgrade+0x920/0x920 [ 178.503207][ C0] ? lock_acquire+0x190/0x410 [ 178.507860][ C0] ? __ip6_finish_output+0x444/0xa50 [ 178.513139][ C0] dev_queue_xmit+0x18/0x20 [ 178.517623][ C0] ? dev_queue_xmit+0x18/0x20 [ 178.522279][ C0] ip6_finish_output2+0xf58/0x2520 [ 178.527382][ C0] ? ip6_forward_finish+0x530/0x530 [ 178.532564][ C0] ? ip6_mtu+0x16f/0x460 [ 178.536791][ C0] __ip6_finish_output+0x444/0xa50 [ 178.541882][ C0] ? __ip6_finish_output+0x444/0xa50 [ 178.547156][ C0] ip6_finish_output+0x38/0x1f0 [ 178.552006][ C0] ip6_output+0x235/0x7c0 [ 178.556324][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 178.561417][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 178.566690][ C0] ? icmp6_dst_alloc+0x432/0x660 [ 178.571613][ C0] mld_sendpack+0x9c7/0xea0 [ 178.576100][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 178.581369][ C0] ? mld_ifc_timer_expire+0x437/0x8a0 [ 178.586722][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 178.592072][ C0] mld_ifc_timer_expire+0x449/0x8a0 [ 178.597254][ C0] call_timer_fn+0x1ac/0x780 [ 178.601822][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 178.607173][ C0] ? msleep_interruptible+0x150/0x150 [ 178.612522][ C0] ? trace_hardirqs_on+0x67/0x240 [ 178.617532][ C0] ? __kasan_check_read+0x11/0x20 [ 178.622535][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 178.627902][ C0] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 178.633253][ C0] run_timer_softirq+0x697/0x17a0 [ 178.638261][ C0] ? add_timer+0x930/0x930 [ 178.642669][ C0] ? kvm_clock_read+0x18/0x30 [ 178.647337][ C0] ? kvm_sched_clock_read+0x9/0x20 [ 178.652424][ C0] ? sched_clock+0x2e/0x50 [ 178.656821][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 178.661651][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 178.667877][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 178.674097][ C0] __do_softirq+0x262/0x98c [ 178.678580][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 178.683410][ C0] irq_exit+0x19b/0x1e0 [ 178.687551][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 178.693076][ C0] apic_timer_interrupt+0xf/0x20 [ 178.697986][ C0] [ 178.700907][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 178.706262][ C0] Code: 78 73 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 24 1b 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 14 1b 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 ee 32 22 fa e8 79 [ 178.725841][ C0] RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 178.734231][ C0] RAX: 1ffffffff11a5e8d RBX: ffffffff88c7a1c0 RCX: 1ffffffff134b5ee [ 178.742183][ C0] RDX: dffffc0000000000 RSI: ffffffff8177f14e RDI: ffffffff873e050c [ 178.750135][ C0] RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439 [ 178.758083][ C0] R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000 [ 178.766032][ C0] R13: ffffffff89a57d78 R14: 0000000000000000 R15: 0000000000000000 [ 178.773989][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 178.779002][ C0] ? default_idle+0x1c/0x360 [ 178.783570][ C0] ? default_idle+0x4e/0x360 [ 178.788143][ C0] arch_cpu_idle+0xa/0x10 [ 178.792448][ C0] default_idle_call+0x84/0xb0 [ 178.797191][ C0] do_idle+0x413/0x760 [ 178.801248][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 178.806249][ C0] ? trace_hardirqs_on+0x67/0x240 [ 178.811264][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 178.817482][ C0] ? debug_smp_processor_id+0x3c/0x214 [ 178.822922][ C0] cpu_startup_entry+0x1b/0x20 [ 178.827678][ C0] rest_init+0x245/0x37b [ 178.831900][ C0] arch_call_rest_init+0xe/0x1b [ 178.836729][ C0] start_kernel+0x912/0x951 [ 178.841210][ C0] ? mem_encrypt_init+0xb/0xb [ 178.845882][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 178.852098][ C0] ? x86_family+0x41/0x50 [ 178.856406][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 178.862630][ C0] x86_64_start_reservations+0x29/0x2b [ 178.868066][ C0] x86_64_start_kernel+0x77/0x7b [ 178.872982][ C0] secondary_startup_64+0xa4/0xb0