[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.307528][ T26] audit: type=1800 audit(1568588387.266:25): pid=8675 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.346268][ T26] audit: type=1800 audit(1568588387.266:26): pid=8675 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.392192][ T26] audit: type=1800 audit(1568588387.276:27): pid=8675 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 '10.128.0.156' (ECDSA) to the list of known hosts. syzkaller login: [ 226.157889][ T8833] IPVS: ftp: loaded support on port[0] = 21 [ 226.222988][ T8833] chnl_net:caif_netlink_parms(): no params data found [ 226.252401][ T8833] bridge0: port 1(bridge_slave_0) entered blocking state [ 226.260453][ T8833] bridge0: port 1(bridge_slave_0) entered disabled state [ 226.268525][ T8833] device bridge_slave_0 entered promiscuous mode [ 226.277696][ T8833] bridge0: port 2(bridge_slave_1) entered blocking state [ 226.284918][ T8833] bridge0: port 2(bridge_slave_1) entered disabled state [ 226.292828][ T8833] device bridge_slave_1 entered promiscuous mode [ 226.311041][ T8833] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 226.321796][ T8833] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 226.342826][ T8833] team0: Port device team_slave_0 added [ 226.349968][ T8833] team0: Port device team_slave_1 added [ 226.408643][ T8833] device hsr_slave_0 entered promiscuous mode [ 226.446521][ T8833] device hsr_slave_1 entered promiscuous mode [ 226.505081][ T8833] bridge0: port 2(bridge_slave_1) entered blocking state [ 226.512421][ T8833] bridge0: port 2(bridge_slave_1) entered forwarding state [ 226.520440][ T8833] bridge0: port 1(bridge_slave_0) entered blocking state [ 226.527625][ T8833] bridge0: port 1(bridge_slave_0) entered forwarding state [ 226.560795][ T8833] 8021q: adding VLAN 0 to HW filter on device bond0 [ 226.574659][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 226.595385][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 226.604431][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 226.613908][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 226.625623][ T8833] 8021q: adding VLAN 0 to HW filter on device team0 [ 226.635803][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 226.644499][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 226.651938][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 226.663778][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 226.672801][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 226.680015][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 226.699112][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 226.708303][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 226.718942][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 226.729893][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 226.741586][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 226.752518][ T8833] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 226.771038][ T8833] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 331.926022][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 331.932862][ C0] rcu: 0-...!: (1 GPs behind) idle=056/1/0x4000000000000002 softirq=8835/8837 fqs=24 [ 331.942719][ C0] (t=10501 jiffies g=7413 q=24) [ 331.947653][ C0] rcu: rcu_preempt kthread starved for 10454 jiffies! g7413 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 331.958927][ C0] rcu: RCU grace-period kthread stack dump: [ 331.964808][ C0] rcu_preempt I29032 10 2 0x80004000 [ 331.971150][ C0] Call Trace: [ 331.974517][ C0] __schedule+0x76e/0x17a0 [ 331.978927][ C0] ? __sched_text_start+0x8/0x8 [ 331.983850][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 331.989641][ C0] ? schedule_timeout+0x47c/0xc50 [ 331.994649][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 331.999920][ C0] schedule+0xd9/0x260 [ 332.003975][ C0] schedule_timeout+0x486/0xc50 [ 332.008838][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 332.015526][ C0] ? usleep_range+0x170/0x170 [ 332.020192][ C0] ? trace_hardirqs_on+0x67/0x240 [ 332.025202][ C0] ? __kasan_check_read+0x11/0x20 [ 332.030212][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 332.035744][ C0] ? swake_up_one+0x60/0x60 [ 332.040236][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 332.044988][ C0] ? invoke_rcu_core+0x230/0x230 [ 332.049908][ C0] ? trace_hardirqs_on+0x67/0x240 [ 332.054913][ C0] ? __kasan_check_read+0x11/0x20 [ 332.059935][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 332.066159][ C0] ? __kthread_parkme+0x108/0x1c0 [ 332.071207][ C0] ? __kasan_check_read+0x11/0x20 [ 332.076243][ C0] kthread+0x361/0x430 [ 332.080313][ C0] ? invoke_rcu_core+0x230/0x230 [ 332.085248][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 332.091501][ C0] ret_from_fork+0x24/0x30 [ 332.096200][ C0] NMI backtrace for cpu 0 [ 332.100578][ C0] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.3.0-rc6-next-20190830 #75 [ 332.110364][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 332.121665][ C0] Workqueue: events iterate_cleanup_work [ 332.127308][ C0] Call Trace: [ 332.130583][ C0] [ 332.133498][ C0] dump_stack+0x172/0x1f0 [ 332.137822][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 332.143005][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 332.149233][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 332.154857][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 332.160843][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 332.166736][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 332.171846][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 332.178435][ C0] ? raise_softirq+0x138/0x340 [ 332.183189][ C0] update_process_times+0x2d/0x70 [ 332.188199][ C0] tick_sched_handle+0xa2/0x190 [ 332.197370][ C0] tick_sched_timer+0x53/0x140 [ 332.202349][ C0] __hrtimer_run_queues+0x364/0xe40 [ 332.207627][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 332.212904][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 332.219922][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 332.225748][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 332.231841][ C0] hrtimer_interrupt+0x314/0x770 [ 332.236780][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 332.242457][ C0] apic_timer_interrupt+0xf/0x20 [ 332.247401][ C0] RIP: 0010:__list_del_entry_valid+0x45/0xf5 [ 332.253392][ C0] Code: 55 48 c1 ea 03 41 54 80 3c 02 00 0f 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 9d 00 00 00 48 b8 00 01 00 00 00 00 ad de 4d 8b 2e 49 39 c5 [ 332.273111][ C0] RSP: 0018:ffff8880ae809060 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 332.281520][ C0] RAX: dffffc0000000000 RBX: ffff8880a14d5af8 RCX: ffffffff85cb69b9 [ 332.289495][ C0] RDX: 1ffff1101429ab5f RSI: ffffffff85cb6e86 RDI: ffff8880a14d5b00 [ 332.297475][ C0] RBP: ffff8880ae809078 R08: ffff8880a9878140 R09: fffffbfff14ed341 [ 332.309182][ C0] R10: ffff8880a9878b20 R11: ffff8880a9878140 R12: ffff8880a14d5b90 [ 332.317154][ C0] R13: ffff8880a14d5800 R14: ffff8880a14d5af8 R15: 0000000000000000 [ 332.325147][ C0] ? apic_timer_interrupt+0xa/0x20 [ 332.330339][ C0] ? hhf_dequeue+0xb9/0xa20 [ 332.334869][ C0] ? hhf_dequeue+0x586/0xa20 [ 332.339496][ C0] hhf_dequeue+0x5c5/0xa20 [ 332.343998][ C0] __qdisc_run+0x1e7/0x19d0 [ 332.348510][ C0] ? dev_queue_xmit+0x18/0x20 [ 332.353180][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 332.358193][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 332.364335][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 332.369609][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 332.375906][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 332.381217][ C0] ? br_forward_finish+0x235/0x400 [ 332.386339][ C0] ? find_held_lock+0x35/0x130 [ 332.391262][ C0] ? br_forward_finish+0x235/0x400 [ 332.396365][ C0] dev_queue_xmit+0x18/0x20 [ 332.400853][ C0] ? dev_queue_xmit+0x18/0x20 [ 332.405514][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 332.411100][ C0] ? __kasan_check_read+0x11/0x20 [ 332.416134][ C0] br_forward_finish+0xfa/0x400 [ 332.421011][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 332.426549][ C0] ? br_fdb_add.cold+0x83/0x83 [ 332.431316][ C0] ? __kasan_check_read+0x11/0x20 [ 332.436351][ C0] __br_forward+0x641/0xb00 [ 332.440852][ C0] ? br_forward_finish+0x400/0x400 [ 332.446590][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 332.452165][ C0] deliver_clone+0x61/0xc0 [ 332.456591][ C0] maybe_deliver+0x2c7/0x390 [ 332.461189][ C0] br_flood+0x13a/0x3d0 [ 332.465381][ C0] br_dev_xmit+0x98c/0x15a0 [ 332.469893][ C0] ? br_poll_controller+0x10/0x10 [ 332.474905][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 332.481047][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 332.486578][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 332.492541][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 332.498775][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 332.503872][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 332.511050][ C0] __dev_queue_xmit+0x2b82/0x37c0 [ 332.516070][ C0] ? __kasan_check_read+0x11/0x20 [ 332.521079][ C0] ? __lock_acquire+0x293a/0x4a00 [ 332.526084][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 332.531008][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 332.536290][ C0] ? __kasan_check_read+0x11/0x20 [ 332.541300][ C0] ? mark_lock+0xc2/0x1220 [ 332.545795][ C0] ? mark_held_locks+0xa4/0xf0 [ 332.550623][ C0] ? ip_finish_output2+0x140e/0x2590 [ 332.555900][ C0] ? __ip_finish_output+0x5fc/0xbc0 [ 332.561076][ C0] ? ip_finish_output2+0x140e/0x2590 [ 332.566347][ C0] dev_queue_xmit+0x18/0x20 [ 332.570917][ C0] ? dev_queue_xmit+0x18/0x20 [ 332.575587][ C0] ip_finish_output2+0x1752/0x2590 [ 332.580827][ C0] ? nf_ct_deliver_cached_events+0x23d/0x6e0 [ 332.586799][ C0] ? ip_frag_next+0x910/0x910 [ 332.591487][ C0] __ip_finish_output+0x5fc/0xbc0 [ 332.596500][ C0] ? __ip_finish_output+0x5fc/0xbc0 [ 332.602169][ C0] ? alloc_chunk+0x120/0x220 [ 332.606759][ C0] ip_finish_output+0x38/0x1f0 [ 332.611507][ C0] ip_output+0x21f/0x670 [ 332.616099][ C0] ? ip_mc_output+0xf70/0xf70 [ 332.620853][ C0] ? __ip_finish_output+0xbc0/0xbc0 [ 332.626047][ C0] ip_local_out+0xbb/0x1b0 [ 332.630481][ C0] igmpv3_sendpack+0x1b5/0x2e0 [ 332.635318][ C0] igmp_ifc_timer_expire+0x687/0xa00 [ 332.640608][ C0] call_timer_fn+0x1ac/0x780 [ 332.645303][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 332.650425][ C0] ? msleep_interruptible+0x150/0x150 [ 332.655807][ C0] ? run_timer_softirq+0x6ae/0x17f0 [ 332.661008][ C0] ? trace_hardirqs_on+0x67/0x240 [ 332.666037][ C0] ? __kasan_check_read+0x11/0x20 [ 332.671073][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 332.677297][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 332.682741][ C0] run_timer_softirq+0x6c0/0x17f0 [ 332.687756][ C0] ? add_timer+0x930/0x930 [ 332.692162][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 332.698305][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 332.703834][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 332.709809][ C0] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 332.715249][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 332.721477][ C0] __do_softirq+0x262/0x98c [ 332.725968][ C0] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 332.732536][ C0] do_softirq_own_stack+0x2a/0x40 [ 332.737539][ C0] [ 332.740476][ C0] do_softirq.part.0+0x11a/0x170 [ 332.745393][ C0] __local_bh_enable_ip+0x211/0x270 [ 332.750585][ C0] nf_ct_iterate_cleanup+0x217/0x4e0 [ 332.755946][ C0] ? nf_ct_alloc_hashtable+0x150/0x150 [ 332.761393][ C0] nf_ct_iterate_cleanup_net+0x133/0x190 [ 332.767012][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 332.774187][ C0] ? nf_ct_iterate_cleanup+0x4e0/0x4e0 [ 332.779893][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 332.787164][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 332.792696][ C0] iterate_cleanup_work+0x4a/0xd7 [ 332.797720][ C0] process_one_work+0x9af/0x1740 [ 332.802660][ C0] ? __schedule+0x776/0x17a0 [ 332.807267][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 332.812623][ C0] ? lock_acquire+0x190/0x410 [ 332.817297][ C0] worker_thread+0x98/0xe40 [ 332.821792][ C0] kthread+0x361/0x430 [ 332.825844][ C0] ? process_one_work+0x1740/0x1740 [ 332.831110][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 332.837336][ C0] ret_from_fork+0x24/0x30