[....] 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. [ 65.389183][ T27] kauditd_printk_skb: 7 callbacks suppressed [ 65.389192][ T27] audit: type=1800 audit(1564208933.639:29): pid=9674 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 [ 65.421835][ T27] audit: type=1800 audit(1564208933.639:30): pid=9674 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 '10.128.10.1' (ECDSA) to the list of known hosts. syzkaller login: [ 191.351930][ T9831] IPVS: ftp: loaded support on port[0] = 21 [ 191.395044][ T9831] chnl_net:caif_netlink_parms(): no params data found [ 191.415864][ T9831] bridge0: port 1(bridge_slave_0) entered blocking state [ 191.423804][ T9831] bridge0: port 1(bridge_slave_0) entered disabled state [ 191.431877][ T9831] device bridge_slave_0 entered promiscuous mode [ 191.439469][ T9831] bridge0: port 2(bridge_slave_1) entered blocking state [ 191.446842][ T9831] bridge0: port 2(bridge_slave_1) entered disabled state [ 191.454578][ T9831] device bridge_slave_1 entered promiscuous mode [ 191.468611][ T9831] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 191.479574][ T9831] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 191.495694][ T9831] team0: Port device team_slave_0 added [ 191.502212][ T9831] team0: Port device team_slave_1 added [ 191.549453][ T9831] device hsr_slave_0 entered promiscuous mode [ 191.598014][ T9831] device hsr_slave_1 entered promiscuous mode [ 191.663397][ T9831] bridge0: port 2(bridge_slave_1) entered blocking state [ 191.671117][ T9831] bridge0: port 2(bridge_slave_1) entered forwarding state [ 191.678474][ T9831] bridge0: port 1(bridge_slave_0) entered blocking state [ 191.685540][ T9831] bridge0: port 1(bridge_slave_0) entered forwarding state [ 191.711155][ T9831] 8021q: adding VLAN 0 to HW filter on device bond0 [ 191.722736][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 191.731573][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 191.740255][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 191.748877][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 191.759443][ T9831] 8021q: adding VLAN 0 to HW filter on device team0 [ 191.769032][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 191.777397][ T3013] bridge0: port 1(bridge_slave_0) entered blocking state [ 191.784502][ T3013] bridge0: port 1(bridge_slave_0) entered forwarding state [ 191.802882][ T9831] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 191.813941][ T9831] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 191.826104][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 191.834975][ T3013] bridge0: port 2(bridge_slave_1) entered blocking state [ 191.842180][ T3013] bridge0: port 2(bridge_slave_1) entered forwarding state [ 191.850454][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready executing program [ 191.858945][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 191.867361][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 191.876663][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 191.884939][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 191.892463][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 191.907174][ T9831] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 297.087531][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 297.094325][ C1] rcu: 1-...!: (10500 ticks this GP) idle=87a/1/0x4000000000000002 softirq=10093/10093 fqs=0 [ 297.104674][ C1] (t=10500 jiffies g=9209 q=23) [ 297.109644][ C1] rcu: rcu_preempt kthread starved for 10500 jiffies! g9209 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 297.120902][ C1] rcu: RCU grace-period kthread stack dump: [ 297.126785][ C1] rcu_preempt I29120 10 2 0x80004000 [ 297.133212][ C1] Call Trace: [ 297.136495][ C1] __schedule+0x755/0x15b0 [ 297.140979][ C1] ? __sched_text_start+0x8/0x8 [ 297.145808][ C1] schedule+0xa8/0x270 [ 297.149854][ C1] schedule_timeout+0x486/0xc50 [ 297.154701][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 297.159617][ C1] ? usleep_range+0x170/0x170 [ 297.164271][ C1] ? trace_hardirqs_on+0x67/0x240 [ 297.169373][ C1] ? __kasan_check_read+0x11/0x20 [ 297.174377][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 297.180007][ C1] ? swake_up_one+0x60/0x60 [ 297.184506][ C1] ? trace_hardirqs_on+0x67/0x240 [ 297.189514][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 297.194280][ C1] ? rcu_barrier+0x310/0x310 [ 297.198955][ C1] ? trace_hardirqs_on+0x67/0x240 [ 297.203959][ C1] ? __kasan_check_read+0x11/0x20 [ 297.209183][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 297.215405][ C1] ? __kthread_parkme+0x108/0x1c0 [ 297.220405][ C1] ? __kasan_check_read+0x11/0x20 [ 297.225405][ C1] kthread+0x361/0x430 [ 297.229622][ C1] ? rcu_barrier+0x310/0x310 [ 297.234188][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 297.240407][ C1] ret_from_fork+0x24/0x30 [ 297.244822][ C1] NMI backtrace for cpu 1 [ 297.249138][ C1] CPU: 1 PID: 9831 Comm: syz-executor373 Not tainted 5.3.0-rc1-next-20190726 #53 [ 297.258215][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 297.268248][ C1] Call Trace: [ 297.271509][ C1] [ 297.274355][ C1] dump_stack+0x172/0x1f0 [ 297.278840][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 297.284018][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 297.290240][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 297.295856][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 297.301824][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 297.307695][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 297.312796][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 297.318410][ C1] ? raise_softirq+0x138/0x340 [ 297.323157][ C1] update_process_times+0x32/0x80 [ 297.328163][ C1] tick_sched_handle+0xa2/0x190 [ 297.332999][ C1] tick_sched_timer+0x53/0x140 [ 297.337744][ C1] __hrtimer_run_queues+0x364/0xe40 [ 297.342921][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 297.348186][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 297.353712][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 297.359424][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 297.365470][ C1] hrtimer_interrupt+0x314/0x770 [ 297.370396][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 297.375919][ C1] apic_timer_interrupt+0xf/0x20 [ 297.380838][ C1] RIP: 0010:native_queued_spin_lock_slowpath+0x132/0x9f0 [ 297.387926][ C1] Code: 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 37 07 00 00 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 73 ff ff ff 8b 45 98 4c 8d 65 d8 3d 00 01 00 00 0f 84 e5 00 00 [ 297.407509][ C1] RSP: 0018:ffff8880ae909210 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 297.415895][ C1] RAX: 0000000000000000 RBX: ffff888096ea0d48 RCX: ffffffff8159a3d7 [ 297.423844][ C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888096ea0d48 [ 297.431899][ C1] RBP: ffff8880ae9092d0 R08: 1ffff11012dd41a9 R09: ffffed1012dd41aa [ 297.439859][ C1] R10: ffffed1012dd41a9 R11: ffff888096ea0d4b R12: 0000000000000001 [ 297.447830][ C1] R13: 0000000000000003 R14: ffffed1012dd41a9 R15: 0000000000000001 [ 297.455786][ C1] ? apic_timer_interrupt+0xa/0x20 [ 297.460896][ C1] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 297.467204][ C1] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 297.473425][ C1] ? mark_held_locks+0xf0/0xf0 [ 297.478171][ C1] do_raw_spin_lock+0x20e/0x2e0 [ 297.483001][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 297.487914][ C1] ? lock_acquire+0x190/0x410 [ 297.492570][ C1] ? release_sock+0x20/0x1c0 [ 297.497157][ C1] ? __kasan_check_read+0x11/0x20 [ 297.502162][ C1] _raw_spin_lock_bh+0x3b/0x50 [ 297.506921][ C1] ? release_sock+0x20/0x1c0 [ 297.511492][ C1] release_sock+0x20/0x1c0 [ 297.516064][ C1] wait_on_pending_writer+0x20f/0x420 [ 297.521414][ C1] ? ip6_rcv_finish+0x1de/0x2f0 [ 297.526242][ C1] ? tls_init+0x560/0x560 [ 297.530550][ C1] ? process_backlog+0x206/0x750 [ 297.535463][ C1] ? net_rx_action+0x508/0x10c0 [ 297.540296][ C1] ? __do_softirq+0x262/0x98c [ 297.544955][ C1] ? prepare_to_wait_exclusive+0x320/0x320 [ 297.550744][ C1] ? inet_release+0xed/0x200 [ 297.555311][ C1] ? inet6_release+0x53/0x80 [ 297.559885][ C1] ? __sock_release+0xce/0x280 [ 297.564626][ C1] ? sock_close+0x1e/0x30 [ 297.568933][ C1] ? __fput+0x2ff/0x890 [ 297.573070][ C1] ? ____fput+0x16/0x20 [ 297.577205][ C1] ? task_work_run+0x145/0x1c0 [ 297.581948][ C1] ? exit_to_usermode_loop+0x316/0x380 [ 297.587391][ C1] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 297.592579][ C1] ? wait_on_pending_writer+0x420/0x420 [ 297.598106][ C1] tls_sk_proto_unhash+0x90/0x3f0 [ 297.603207][ C1] tcp_set_state+0x5b9/0x7d0 [ 297.607797][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 297.614010][ C1] ? __sk_mem_reduce_allocated+0x1b0/0x560 [ 297.619794][ C1] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 297.625317][ C1] ? __sk_mem_reclaim+0x55/0x70 [ 297.630146][ C1] ? tcp_write_queue_purge+0x5d8/0x1310 [ 297.635667][ C1] ? lock_downgrade+0x920/0x920 [ 297.640496][ C1] tcp_done+0xe2/0x320 [ 297.644546][ C1] tcp_reset+0x132/0x500 [ 297.648783][ C1] tcp_validate_incoming+0xa2d/0x1660 [ 297.654928][ C1] tcp_rcv_established+0x6b5/0x1e70 [ 297.660107][ C1] ? tcp_data_queue+0x4860/0x4860 [ 297.665112][ C1] tcp_v6_do_rcv+0x41e/0x12c0 [ 297.669767][ C1] tcp_v6_rcv+0x31f1/0x3500 [ 297.674263][ C1] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 297.679787][ C1] ? nf_confirm+0x360/0x4d0 [ 297.685072][ C1] ? mark_held_locks+0xf0/0xf0 [ 297.689814][ C1] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 297.695439][ C1] ip6_input_finish+0x84/0x170 [ 297.700192][ C1] ip6_input+0xe4/0x3f0 [ 297.704322][ C1] ? ip6_input_finish+0x170/0x170 [ 297.709334][ C1] ? __kasan_check_read+0x11/0x20 [ 297.714339][ C1] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 297.720227][ C1] ? lock_downgrade+0x920/0x920 [ 297.725064][ C1] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 297.731302][ C1] ip6_rcv_finish+0x1de/0x2f0 [ 297.735974][ C1] ipv6_rcv+0x10e/0x420 [ 297.740108][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 297.745647][ C1] ? lock_downgrade+0x920/0x920 [ 297.750486][ C1] ? lock_downgrade+0x920/0x920 [ 297.755320][ C1] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 297.761278][ C1] ? trace_hardirqs_off+0x62/0x240 [ 297.766453][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 297.772584][ C1] __netif_receive_skb_one_core+0x113/0x1a0 [ 297.778718][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 297.784591][ C1] ? lock_acquire+0x190/0x410 [ 297.789245][ C1] ? process_backlog+0x195/0x750 [ 297.794162][ C1] __netif_receive_skb+0x2c/0x1d0 [ 297.799276][ C1] process_backlog+0x206/0x750 [ 297.804015][ C1] ? lock_acquire+0x190/0x410 [ 297.808688][ C1] ? clockevents_program_event+0x15a/0x370 [ 297.814476][ C1] net_rx_action+0x508/0x10c0 [ 297.819133][ C1] ? napi_complete_done+0x4b0/0x4b0 [ 297.824309][ C1] ? sched_clock+0x2e/0x50 [ 297.828705][ C1] ? kvm_clock_read+0x18/0x30 [ 297.833362][ C1] ? inet_csk_listen_stop+0x1bc/0x850 [ 297.838797][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 297.845031][ C1] __do_softirq+0x262/0x98c [ 297.849514][ C1] ? inet_csk_listen_stop+0x1bc/0x850 [ 297.854866][ C1] do_softirq_own_stack+0x2a/0x40 [ 297.859861][ C1] [ 297.862867][ C1] do_softirq.part.0+0x11a/0x170 [ 297.867782][ C1] __local_bh_enable_ip+0x211/0x270 [ 297.872981][ C1] inet_csk_listen_stop+0x1e0/0x850 [ 297.878170][ C1] tcp_close+0xd5b/0x10e0 [ 297.882495][ C1] ? ip_mc_drop_socket+0x211/0x270 [ 297.887602][ C1] ? down_write+0xdf/0x150 [ 297.892018][ C1] inet_release+0xed/0x200 [ 297.897238][ C1] inet6_release+0x53/0x80 [ 297.901637][ C1] __sock_release+0xce/0x280 [ 297.906210][ C1] sock_close+0x1e/0x30 [ 297.910367][ C1] __fput+0x2ff/0x890 [ 297.914329][ C1] ? __sock_release+0x280/0x280 [ 297.919161][ C1] ____fput+0x16/0x20 [ 297.923246][ C1] task_work_run+0x145/0x1c0 [ 297.927820][ C1] exit_to_usermode_loop+0x316/0x380 [ 297.933085][ C1] do_syscall_64+0x65f/0x760 [ 297.937660][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 297.943615][ C1] RIP: 0033:0x406571 [ 297.947499][ C1] 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 [ 297.967188][ C1] RSP: 002b:00007ffeec3c5fa0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 297.975580][ C1] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406571 [ 297.983535][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 297.991496][ C1] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 297.999449][ C1] R10: 00007ffeec3c5fd0 R11: 0000000000000293 R12: 00007ffeec3c6000 [ 298.007398][ C1] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007 [ 301.667569][ T5] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10928 jiffies s: 105 root: 0x2/. [ 301.679726][ T5] rcu: blocking rcu_node structures: [ 301.685008][ T5] Task dump for CPU 1: [ 301.689349][ T5] syz-executor373 R running task 24368 9831 9830 0x8000000a [ 301.697245][ T5] Call Trace: [ 301.701113][ T5] ? __kasan_check_read+0x11/0x20 [ 301.706215][ T5] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.712627][ T5] ? lock_downgrade+0x920/0x920 [ 301.717471][ T5] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.724208][ T5] ? __this_cpu_preempt_check+0x3a/0x210 [ 301.729975][ T5] ? inet_csk_listen_stop+0x1bc/0x850 [ 301.735330][ T5] ? ksoftirqd_running+0x16/0x70 [ 301.740726][ T5] ? inet_csk_listen_stop+0x1bc/0x850 [ 301.746089][ T5] ? do_softirq.part.0+0x11a/0x170 [ 301.751451][ T5] ? __local_bh_enable_ip+0x211/0x270 [ 301.757079][ T5] ? inet_csk_listen_stop+0x1e0/0x850 [ 301.762972][ T5] ? tcp_close+0xd5b/0x10e0 [ 301.769263][ T5] ? ip_mc_drop_socket+0x211/0x270 [ 301.774356][ T5] ? down_write+0xdf/0x150 [ 301.779243][ T5] ? inet_release+0xed/0x200 [ 301.783921][ T5] ? inet6_release+0x53/0x80 [ 301.788645][ T5] ? __sock_release+0xce/0x280 [ 301.793411][ T5] ? sock_close+0x1e/0x30 [ 301.798218][ T5] ? __fput+0x2ff/0x890 [ 301.802363][ T5] ? __sock_release+0x280/0x280 [ 301.807279][ T5] ? ____fput+0x16/0x20 [ 301.811596][ T5] ? task_work_run+0x145/0x1c0 [ 301.816377][ T5] ? exit_to_usermode_loop+0x316/0x380 [ 301.822396][ T5] ? do_syscall_64+0x65f/0x760 [ 301.827175][ T5] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe