[....] 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. [ 66.122991][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 66.123001][ T26] audit: type=1800 audit(1564376768.833:29): pid=9646 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 [ 66.149379][ T26] audit: type=1800 audit(1564376768.833:30): pid=9646 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 '10.128.0.111' (ECDSA) to the list of known hosts. syzkaller login: [ 196.339483][ T9803] IPVS: ftp: loaded support on port[0] = 21 [ 196.382375][ T9803] chnl_net:caif_netlink_parms(): no params data found [ 196.403334][ T9803] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.410921][ T9803] bridge0: port 1(bridge_slave_0) entered disabled state [ 196.418697][ T9803] device bridge_slave_0 entered promiscuous mode [ 196.425838][ T9803] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.433077][ T9803] bridge0: port 2(bridge_slave_1) entered disabled state [ 196.440654][ T9803] device bridge_slave_1 entered promiscuous mode [ 196.454242][ T9803] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 196.464923][ T9803] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 196.480862][ T9803] team0: Port device team_slave_0 added [ 196.487812][ T9803] team0: Port device team_slave_1 added [ 196.569540][ T9803] device hsr_slave_0 entered promiscuous mode [ 196.608261][ T9803] device hsr_slave_1 entered promiscuous mode [ 196.663262][ T9803] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.670644][ T9803] bridge0: port 2(bridge_slave_1) entered forwarding state [ 196.678177][ T9803] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.685236][ T9803] bridge0: port 1(bridge_slave_0) entered forwarding state [ 196.709725][ T9803] 8021q: adding VLAN 0 to HW filter on device bond0 [ 196.721240][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 196.729930][ T23] bridge0: port 1(bridge_slave_0) entered disabled state [ 196.737429][ T23] bridge0: port 2(bridge_slave_1) entered disabled state [ 196.745334][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 196.755191][ T9803] 8021q: adding VLAN 0 to HW filter on device team0 [ 196.764671][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 196.773092][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.780159][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 196.789823][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 196.798777][ T23] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.805810][ T23] bridge0: port 2(bridge_slave_1) entered forwarding state [ 196.823604][ T9803] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 196.834078][ T9803] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 196.846494][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 196.855091][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 196.863624][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 196.872264][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 196.880631][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 196.888291][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 196.903353][ T9803] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 196.933060][ C1] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 302.107952][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 302.114722][ C0] rcu: 0-...!: (10503 ticks this GP) idle=d36/1/0x4000000000000002 softirq=9581/9582 fqs=1 [ 302.124852][ C0] (t=10501 jiffies g=9549 q=4) [ 302.129710][ C0] rcu: rcu_preempt kthread starved for 10500 jiffies! g9549 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 302.140785][ C0] rcu: RCU grace-period kthread stack dump: [ 302.146653][ C0] rcu_preempt R running task 29392 10 2 0x80004000 [ 302.154545][ C0] Call Trace: [ 302.157857][ C0] __schedule+0x755/0x15b0 [ 302.162259][ C0] ? __sched_text_start+0x8/0x8 [ 302.167093][ C0] schedule+0xa8/0x270 [ 302.171187][ C0] schedule_timeout+0x486/0xc50 [ 302.176035][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 302.180954][ C0] ? usleep_range+0x170/0x170 [ 302.185609][ C0] ? trace_hardirqs_on+0x67/0x240 [ 302.190617][ C0] ? __kasan_check_read+0x11/0x20 [ 302.195639][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 302.201168][ C0] ? swake_up_one+0x60/0x60 [ 302.205672][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 302.210420][ C0] ? rcu_barrier+0x310/0x310 [ 302.214992][ C0] ? trace_hardirqs_on+0x67/0x240 [ 302.219993][ C0] ? __kasan_check_read+0x11/0x20 [ 302.225003][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 302.231226][ C0] ? __kthread_parkme+0x108/0x1c0 [ 302.236242][ C0] ? __kasan_check_read+0x11/0x20 [ 302.241253][ C0] kthread+0x361/0x430 [ 302.245307][ C0] ? rcu_barrier+0x310/0x310 [ 302.249896][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 302.256132][ C0] ret_from_fork+0x24/0x30 [ 302.260536][ C0] NMI backtrace for cpu 0 [ 302.264850][ C0] CPU: 0 PID: 9803 Comm: syz-executor365 Not tainted 5.3.0-rc1-next-20190726 #53 [ 302.273933][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 302.284056][ C0] Call Trace: [ 302.287328][ C0] [ 302.290246][ C0] dump_stack+0x172/0x1f0 [ 302.294560][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 302.299751][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 302.305980][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 302.311599][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 302.317566][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 302.323726][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 302.329087][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 302.334620][ C0] ? raise_softirq+0x138/0x340 [ 302.339373][ C0] update_process_times+0x32/0x80 [ 302.344422][ C0] tick_sched_handle+0xa2/0x190 [ 302.349279][ C0] tick_sched_timer+0x53/0x140 [ 302.354034][ C0] __hrtimer_run_queues+0x364/0xe40 [ 302.359393][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 302.364754][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 302.370289][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 302.376869][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 302.382924][ C0] hrtimer_interrupt+0x314/0x770 [ 302.387853][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 302.393492][ C0] apic_timer_interrupt+0xf/0x20 [ 302.398431][ C0] RIP: 0010:__kasan_check_read+0x0/0x20 [ 302.403967][ C0] Code: e8 99 48 af ff 0f 0b 4c 8b 4d d0 e9 27 ee ff ff 48 8b 73 58 89 c2 48 c7 c7 c8 a9 89 88 f7 da e8 7a 48 af ff e9 da ee ff ff 90 <55> 89 f6 31 d2 48 89 e5 48 8b 4d 08 e8 cf 26 00 00 5d c3 0f 1f 00 [ 302.426174][ C0] RSP: 0018:ffff8880ae809208 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 302.434590][ C0] RAX: 0000000000000000 RBX: ffff888093282d08 RCX: ffffffff8159a3d7 [ 302.442755][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888093282d08 [ 302.450726][ C0] RBP: ffff8880ae8092d0 R08: 1ffff110126505a1 R09: ffffed10126505a2 [ 302.458695][ C0] R10: ffffed10126505a1 R11: ffff888093282d0b R12: 0000000000000001 [ 302.466669][ C0] R13: 0000000000000003 R14: ffffed10126505a1 R15: 0000000000000001 [ 302.474645][ C0] ? apic_timer_interrupt+0xa/0x20 [ 302.479759][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 302.486071][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 302.492382][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 302.498695][ C0] ? mark_held_locks+0xf0/0xf0 [ 302.503449][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 302.508281][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 302.513205][ C0] ? lock_acquire+0x190/0x410 [ 302.517933][ C0] ? release_sock+0x20/0x1c0 [ 302.522509][ C0] ? __kasan_check_read+0x11/0x20 [ 302.527518][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 302.532272][ C0] ? release_sock+0x20/0x1c0 [ 302.536873][ C0] release_sock+0x20/0x1c0 [ 302.541348][ C0] wait_on_pending_writer+0x20f/0x420 [ 302.546730][ C0] ? ip6_rcv_finish+0x1de/0x2f0 [ 302.551595][ C0] ? tls_init+0x560/0x560 [ 302.555936][ C0] ? process_backlog+0x206/0x750 [ 302.560855][ C0] ? net_rx_action+0x508/0x10c0 [ 302.565693][ C0] ? __do_softirq+0x262/0x98c [ 302.570364][ C0] ? prepare_to_wait_exclusive+0x320/0x320 [ 302.576209][ C0] ? inet_release+0xed/0x200 [ 302.580807][ C0] ? inet6_release+0x53/0x80 [ 302.585431][ C0] ? __sock_release+0xce/0x280 [ 302.590206][ C0] ? sock_close+0x1e/0x30 [ 302.594522][ C0] ? __fput+0x2ff/0x890 [ 302.598658][ C0] ? ____fput+0x16/0x20 [ 302.602811][ C0] ? task_work_run+0x145/0x1c0 [ 302.607559][ C0] ? exit_to_usermode_loop+0x316/0x380 [ 302.613021][ C0] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 302.618294][ C0] ? wait_on_pending_writer+0x420/0x420 [ 302.623839][ C0] tls_sk_proto_unhash+0x90/0x3f0 [ 302.629000][ C0] tcp_set_state+0x5b9/0x7d0 [ 302.633587][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 302.639821][ C0] ? __sk_mem_reduce_allocated+0x1b0/0x560 [ 302.645616][ C0] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 302.651057][ C0] ? __sk_mem_reclaim+0x55/0x70 [ 302.655893][ C0] ? tcp_write_queue_purge+0x5d8/0x1310 [ 302.661511][ C0] ? inet6_sk_rx_dst_set+0x244/0x6f0 [ 302.667225][ C0] tcp_done+0xe2/0x320 [ 302.671285][ C0] tcp_reset+0x132/0x500 [ 302.675512][ C0] tcp_validate_incoming+0xa2d/0x1660 [ 302.680870][ C0] tcp_rcv_established+0x6b5/0x1e70 [ 302.686053][ C0] ? mark_held_locks+0xf0/0xf0 [ 302.690866][ C0] ? sk_filter_trim_cap+0x45f/0xb30 [ 302.696049][ C0] ? tcp_data_queue+0x4860/0x4860 [ 302.701056][ C0] ? do_raw_spin_lock+0x12a/0x2e0 [ 302.706072][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 302.711001][ C0] ? lock_acquire+0x190/0x410 [ 302.715680][ C0] tcp_v6_do_rcv+0x41e/0x12c0 [ 302.720346][ C0] tcp_v6_rcv+0x31f1/0x3500 [ 302.724840][ C0] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 302.730420][ C0] ? nf_confirm+0x360/0x4d0 [ 302.734911][ C0] ? mark_held_locks+0xf0/0xf0 [ 302.739661][ C0] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 302.745293][ C0] ip6_input_finish+0x84/0x170 [ 302.750042][ C0] ip6_input+0xe4/0x3f0 [ 302.754181][ C0] ? ip6_input_finish+0x170/0x170 [ 302.759231][ C0] ? __kasan_check_read+0x11/0x20 [ 302.764241][ C0] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 302.770150][ C0] ? lock_downgrade+0x920/0x920 [ 302.774985][ C0] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 302.781218][ C0] ip6_rcv_finish+0x1de/0x2f0 [ 302.785893][ C0] ipv6_rcv+0x10e/0x420 [ 302.790030][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 302.795557][ C0] ? lock_downgrade+0x920/0x920 [ 302.800407][ C0] ? lock_downgrade+0x920/0x920 [ 302.805247][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 302.811735][ C0] ? trace_hardirqs_off+0x62/0x240 [ 302.817092][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 302.822636][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 302.828529][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 302.834409][ C0] ? lock_acquire+0x190/0x410 [ 302.839172][ C0] ? process_backlog+0x195/0x750 [ 302.844121][ C0] __netif_receive_skb+0x2c/0x1d0 [ 302.849131][ C0] process_backlog+0x206/0x750 [ 302.853911][ C0] ? lock_acquire+0x190/0x410 [ 302.858587][ C0] ? clockevents_program_event+0x15a/0x370 [ 302.864375][ C0] net_rx_action+0x508/0x10c0 [ 302.869050][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 302.874231][ C0] ? sched_clock+0x2e/0x50 [ 302.878644][ C0] ? kvm_clock_read+0x18/0x30 [ 302.883305][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 302.888831][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 302.895059][ C0] __do_softirq+0x262/0x98c [ 302.899546][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 302.905348][ C0] do_softirq_own_stack+0x2a/0x40 [ 302.910364][ C0] [ 302.913299][ C0] do_softirq.part.0+0x11a/0x170 [ 302.918218][ C0] __local_bh_enable_ip+0x211/0x270 [ 302.923399][ C0] inet_csk_listen_stop+0x1e0/0x850 [ 302.928581][ C0] tcp_close+0xd5b/0x10e0 [ 302.932893][ C0] ? ip_mc_drop_socket+0x211/0x270 [ 302.938001][ C0] ? down_write+0xdf/0x150 [ 302.942399][ C0] inet_release+0xed/0x200 [ 302.946803][ C0] inet6_release+0x53/0x80 [ 302.951204][ C0] __sock_release+0xce/0x280 [ 302.955780][ C0] sock_close+0x1e/0x30 [ 302.959921][ C0] __fput+0x2ff/0x890 [ 302.963888][ C0] ? __sock_release+0x280/0x280 [ 302.968746][ C0] ____fput+0x16/0x20 [ 302.972712][ C0] task_work_run+0x145/0x1c0 [ 302.977289][ C0] exit_to_usermode_loop+0x316/0x380 [ 302.982572][ C0] do_syscall_64+0x65f/0x760 [ 302.987148][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 302.993020][ C0] RIP: 0033:0x406581 [ 302.996922][ C0] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 303.016507][ C0] RSP: 002b:00007ffecb3086a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 303.024989][ C0] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406581 [ 303.032945][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 303.040897][ C0] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 303.048852][ C0] R10: 00007ffecb3086d0 R11: 0000000000000293 R12: 00007ffecb308700 [ 303.056813][ C0] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000008