[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 57.054083][ T26] audit: type=1800 audit(1568002309.859:25): pid=8773 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.091442][ T26] audit: type=1800 audit(1568002309.859:26): pid=8773 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.168550][ T26] audit: type=1800 audit(1568002309.859:27): pid=8773 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.121' (ECDSA) to the list of known hosts. syzkaller login: [ 334.484160][ T8928] IPVS: ftp: loaded support on port[0] = 21 [ 334.561957][ T8928] chnl_net:caif_netlink_parms(): no params data found [ 334.590493][ T8928] bridge0: port 1(bridge_slave_0) entered blocking state [ 334.598084][ T8928] bridge0: port 1(bridge_slave_0) entered disabled state [ 334.606294][ T8928] device bridge_slave_0 entered promiscuous mode [ 334.614808][ T8928] bridge0: port 2(bridge_slave_1) entered blocking state [ 334.622088][ T8928] bridge0: port 2(bridge_slave_1) entered disabled state [ 334.630282][ T8928] device bridge_slave_1 entered promiscuous mode [ 334.647222][ T8928] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 334.658285][ T8928] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 334.678054][ T8928] team0: Port device team_slave_0 added [ 334.685632][ T8928] team0: Port device team_slave_1 added [ 334.742363][ T8928] device hsr_slave_0 entered promiscuous mode [ 334.799926][ T8928] device hsr_slave_1 entered promiscuous mode [ 334.848005][ T8928] bridge0: port 2(bridge_slave_1) entered blocking state [ 334.855617][ T8928] bridge0: port 2(bridge_slave_1) entered forwarding state [ 334.863682][ T8928] bridge0: port 1(bridge_slave_0) entered blocking state [ 334.870973][ T8928] bridge0: port 1(bridge_slave_0) entered forwarding state [ 334.904643][ T8928] 8021q: adding VLAN 0 to HW filter on device bond0 [ 334.916816][ T8930] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 334.937674][ T8930] bridge0: port 1(bridge_slave_0) entered disabled state [ 334.946508][ T8930] bridge0: port 2(bridge_slave_1) entered disabled state [ 334.955821][ T8930] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 334.967372][ T8928] 8021q: adding VLAN 0 to HW filter on device team0 [ 334.978666][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 334.987230][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 334.994331][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 335.010905][ T8932] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 335.020553][ T8932] bridge0: port 2(bridge_slave_1) entered blocking state [ 335.027690][ T8932] bridge0: port 2(bridge_slave_1) entered forwarding state [ 335.045070][ T8928] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 335.056161][ T8928] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 335.068830][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 335.077610][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 335.086085][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 335.094773][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 335.103714][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 335.111443][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 335.129935][ T8928] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 440.199401][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 440.206139][ C0] rcu: 0-...!: (10500 ticks this GP) idle=236/0/0x3 softirq=9219/9219 fqs=0 [ 440.215206][ C0] (t=10500 jiffies g=7497 q=48) [ 440.220227][ C0] rcu: rcu_preempt kthread starved for 10500 jiffies! g7497 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 440.231488][ C0] rcu: RCU grace-period kthread stack dump: [ 440.237714][ C0] rcu_preempt I29360 10 2 0x80004000 [ 440.244036][ C0] Call Trace: [ 440.247411][ C0] __schedule+0x76e/0x17a0 [ 440.251829][ C0] ? __sched_text_start+0x8/0x8 [ 440.256699][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 440.262516][ C0] ? schedule_timeout+0x47c/0xc50 [ 440.267541][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 440.272816][ C0] schedule+0xd9/0x260 [ 440.276883][ C0] schedule_timeout+0x486/0xc50 [ 440.281720][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 440.287522][ C0] ? usleep_range+0x170/0x170 [ 440.292365][ C0] ? trace_hardirqs_on+0x67/0x240 [ 440.297475][ C0] ? __kasan_check_read+0x11/0x20 [ 440.302491][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 440.308028][ C0] ? swake_up_one+0x60/0x60 [ 440.312533][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 440.317331][ C0] ? invoke_rcu_core+0x230/0x230 [ 440.322794][ C0] ? trace_hardirqs_on+0x67/0x240 [ 440.327816][ C0] ? __kasan_check_read+0x11/0x20 [ 440.332846][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 440.339170][ C0] ? __kthread_parkme+0x108/0x1c0 [ 440.344180][ C0] ? __kasan_check_read+0x11/0x20 [ 440.349325][ C0] kthread+0x361/0x430 [ 440.353378][ C0] ? invoke_rcu_core+0x230/0x230 [ 440.358301][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 440.364530][ C0] ret_from_fork+0x24/0x30 [ 440.368993][ C0] NMI backtrace for cpu 0 [ 440.373312][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc6-next-20190830 #75 [ 440.381635][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 440.391678][ C0] Call Trace: [ 440.394955][ C0] <IRQ> [ 440.397961][ C0] dump_stack+0x172/0x1f0 [ 440.402282][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 440.407468][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 440.413710][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 440.419432][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 440.425503][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 440.431403][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 440.436900][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 440.442473][ C0] ? raise_softirq+0x138/0x340 [ 440.447238][ C0] update_process_times+0x2d/0x70 [ 440.452510][ C0] tick_sched_handle+0xa2/0x190 [ 440.457350][ C0] tick_sched_timer+0x53/0x140 [ 440.462103][ C0] __hrtimer_run_queues+0x364/0xe40 [ 440.467440][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 440.472733][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 440.478722][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 440.484448][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 440.490610][ C0] hrtimer_interrupt+0x314/0x770 [ 440.495567][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 440.501144][ C0] apic_timer_interrupt+0xf/0x20 [ 440.507488][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 [ 440.514581][ C0] Code: 90 00 13 00 00 83 fa 02 75 20 48 8b 88 08 13 00 00 8b 80 04 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 <5d> c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 98 a7 8f 7e a9 [ 440.534349][ C0] RSP: 0018:ffff8880ae809028 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 440.547022][ C0] RAX: ffffffff88e7a180 RBX: ffff888093f8a2f8 RCX: ffffffff85cb6f79 [ 440.554980][ C0] RDX: 0000000000000100 RSI: ffffffff85cb6f8b RDI: 0000000000000001 [ 440.562948][ C0] RBP: ffff8880ae809028 R08: ffffffff88e7a180 R09: fffffbfff14ed341 [ 440.571001][ C0] R10: ffffffff88e7ab10 R11: ffffffff88e7a180 R12: dffffc0000000000 [ 440.578957][ C0] R13: ffff888093f8a000 R14: ffff888093f8a398 R15: ffff888093f8a390 [ 440.586936][ C0] ? apic_timer_interrupt+0xa/0x20 [ 440.592119][ C0] ? hhf_dequeue+0x679/0xa20 [ 440.596695][ C0] ? hhf_dequeue+0x68b/0xa20 [ 440.601290][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 440.607514][ C0] hhf_dequeue+0x68b/0xa20 [ 440.612075][ C0] __qdisc_run+0x1e7/0x19d0 [ 440.616573][ C0] ? dev_queue_xmit+0x18/0x20 [ 440.621246][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 440.626262][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 440.632511][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 440.637883][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 440.644524][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 440.649827][ C0] ? br_forward_finish+0x235/0x400 [ 440.654927][ C0] ? find_held_lock+0x35/0x130 [ 440.659681][ C0] ? br_forward_finish+0x235/0x400 [ 440.664872][ C0] dev_queue_xmit+0x18/0x20 [ 440.669545][ C0] ? dev_queue_xmit+0x18/0x20 [ 440.674235][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 440.679590][ C0] ? __kasan_check_read+0x11/0x20 [ 440.684783][ C0] br_forward_finish+0xfa/0x400 [ 440.689652][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 440.696836][ C0] ? br_fdb_add.cold+0x83/0x83 [ 440.701623][ C0] ? __kasan_check_read+0x11/0x20 [ 440.706647][ C0] __br_forward+0x641/0xb00 [ 440.711150][ C0] ? br_forward_finish+0x400/0x400 [ 440.716276][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 440.721813][ C0] deliver_clone+0x61/0xc0 [ 440.726425][ C0] maybe_deliver+0x2c7/0x390 [ 440.731176][ C0] br_flood+0x13a/0x3d0 [ 440.735421][ C0] br_dev_xmit+0x98c/0x15a0 [ 440.740033][ C0] ? br_poll_controller+0x10/0x10 [ 440.745043][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 440.751188][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 440.756781][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 440.762784][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 440.769109][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 440.774263][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 440.780591][ C0] __dev_queue_xmit+0x2b82/0x37c0 [ 440.785614][ C0] ? __kasan_check_read+0x11/0x20 [ 440.790623][ C0] ? __lock_acquire+0x293a/0x4a00 [ 440.795991][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 440.800928][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 440.806881][ C0] ? __kasan_check_read+0x11/0x20 [ 440.811898][ C0] ? mark_lock+0xc2/0x1220 [ 440.816492][ C0] ? mark_held_locks+0xa4/0xf0 [ 440.821312][ C0] ? ip_finish_output2+0x140e/0x2590 [ 440.826604][ C0] ? __ip_finish_output+0x5fc/0xbc0 [ 440.831885][ C0] ? ip_finish_output2+0x140e/0x2590 [ 440.837614][ C0] dev_queue_xmit+0x18/0x20 [ 440.842199][ C0] ? dev_queue_xmit+0x18/0x20 [ 440.846874][ C0] ip_finish_output2+0x1752/0x2590 [ 440.852335][ C0] ? nf_ct_deliver_cached_events+0x23d/0x6e0 [ 440.858318][ C0] ? ip_frag_next+0x910/0x910 [ 440.862987][ C0] __ip_finish_output+0x5fc/0xbc0 [ 440.868007][ C0] ? __ip_finish_output+0x5fc/0xbc0 [ 440.873195][ C0] ? alloc_chunk+0x120/0x220 [ 440.878044][ C0] ip_finish_output+0x38/0x1f0 [ 440.883239][ C0] ip_output+0x21f/0x670 [ 440.888693][ C0] ? ip_mc_output+0xf70/0xf70 [ 440.893361][ C0] ? __ip_finish_output+0xbc0/0xbc0 [ 440.898657][ C0] ip_local_out+0xbb/0x1b0 [ 440.903099][ C0] igmpv3_sendpack+0x1b5/0x2e0 [ 440.907852][ C0] igmp_ifc_timer_expire+0x687/0xa00 [ 440.913146][ C0] call_timer_fn+0x1ac/0x780 [ 440.917732][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 440.922832][ C0] ? msleep_interruptible+0x150/0x150 [ 440.928195][ C0] ? run_timer_softirq+0x6ae/0x17f0 [ 440.933470][ C0] ? trace_hardirqs_on+0x67/0x240 [ 440.938478][ C0] ? __kasan_check_read+0x11/0x20 [ 440.943484][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 440.948587][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 440.953682][ C0] run_timer_softirq+0x6c0/0x17f0 [ 440.958788][ C0] ? add_timer+0x930/0x930 [ 440.963191][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 440.969330][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 440.974871][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 440.980840][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 440.987079][ C0] __do_softirq+0x262/0x98c [ 440.991577][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 440.996454][ C0] irq_exit+0x19b/0x1e0 [ 441.000682][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 441.006213][ C0] apic_timer_interrupt+0xf/0x20 [ 441.011153][ C0] </IRQ> [ 441.014271][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 441.019631][ C0] 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 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e a7 1c fa e8 69 [ 441.039226][ C0] RSP: 0018:ffffffff88e07c50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 441.047633][ C0] RAX: 1ffffffff11e5db7 RBX: 0000000000000000 RCX: 0000000000000000 [ 441.055590][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88e7aa1c [ 441.063638][ C0] RBP: ffffffff88e07c80 R08: ffffffff88e7a180 R09: 0000000000000000 [ 441.071609][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 441.079652][ C0] R13: 0000000000000000 R14: 0000000000000060 R15: 0000000000000001 [ 441.087631][ C0] ? default_idle+0x4e/0x360 [ 441.092293][ C0] default_enter_idle+0x71/0xf0 [ 441.097577][ C0] cpuidle_enter_state+0xef/0xfb0 [ 441.102587][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 441.108825][ C0] cpuidle_enter+0x4f/0xa0 [ 441.113230][ C0] do_idle+0x45f/0x6e0 [ 441.117290][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 441.122299][ C0] ? trace_hardirqs_on+0x30/0x240 [ 441.127387][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 441.133813][ C0] ? debug_smp_processor_id+0x3c/0x214 [ 441.139265][ C0] cpu_startup_entry+0x1b/0x20 [ 441.144023][ C0] rest_init+0x245/0x37b [ 441.148418][ C0] arch_call_rest_init+0xe/0x1b [ 441.153260][ C0] start_kernel+0x904/0x943 [ 441.157749][ C0] ? mem_encrypt_init+0xb/0xb [ 441.162419][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 441.168750][ C0] ? x86_family+0x41/0x50 [ 441.173064][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 441.179293][ C0] x86_64_start_reservations+0x29/0x2b [ 441.184740][ C0] x86_64_start_kernel+0x77/0x7b [ 441.189665][ C0] secondary_startup_64+0xa4/0xb0