[....] 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. [ 63.943343][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 63.943352][ T26] audit: type=1800 audit(1568497528.577:29): pid=9599 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 [ 63.976611][ T26] audit: type=1800 audit(1568497528.577:30): pid=9599 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 '10.128.1.62' (ECDSA) to the list of known hosts. syzkaller login: [ 237.968472][ T9752] IPVS: ftp: loaded support on port[0] = 21 [ 238.009070][ T9752] chnl_net:caif_netlink_parms(): no params data found [ 238.031329][ T9752] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.038429][ T9752] bridge0: port 1(bridge_slave_0) entered disabled state [ 238.046054][ T9752] device bridge_slave_0 entered promiscuous mode [ 238.053255][ T9752] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.060556][ T9752] bridge0: port 2(bridge_slave_1) entered disabled state [ 238.068176][ T9752] device bridge_slave_1 entered promiscuous mode [ 238.081708][ T9752] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 238.091830][ T9752] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 238.106798][ T9752] team0: Port device team_slave_0 added [ 238.113601][ T9752] team0: Port device team_slave_1 added [ 238.191772][ T9752] device hsr_slave_0 entered promiscuous mode [ 238.260619][ T9752] device hsr_slave_1 entered promiscuous mode [ 238.335130][ T9752] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.342241][ T9752] bridge0: port 2(bridge_slave_1) entered forwarding state [ 238.349516][ T9752] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.356588][ T9752] bridge0: port 1(bridge_slave_0) entered forwarding state [ 238.380543][ T9752] 8021q: adding VLAN 0 to HW filter on device bond0 [ 238.391172][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 238.399153][ T3024] bridge0: port 1(bridge_slave_0) entered disabled state [ 238.407611][ T3024] bridge0: port 2(bridge_slave_1) entered disabled state [ 238.415195][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 238.425171][ T9752] 8021q: adding VLAN 0 to HW filter on device team0 [ 238.434182][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 238.443993][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.451048][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 238.460259][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 238.468641][ T3024] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.475706][ T3024] bridge0: port 2(bridge_slave_1) entered forwarding state [ 238.489005][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 238.497847][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 238.507562][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 238.517879][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 238.528110][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 238.537180][ T9752] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 238.551212][ T9752] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 343.570186][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 343.576838][ C0] rcu: 0-...!: (10500 ticks this GP) idle=cf2/1/0x4000000000000002 softirq=8976/8976 fqs=0 [ 343.586973][ C0] (t=10500 jiffies g=9053 q=213) [ 343.591980][ C0] rcu: rcu_preempt kthread starved for 10500 jiffies! g9053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 343.603226][ C0] rcu: RCU grace-period kthread stack dump: [ 343.609096][ C0] rcu_preempt I29520 10 2 0x80004000 [ 343.615410][ C0] Call Trace: [ 343.618772][ C0] __schedule+0x755/0x1580 [ 343.623348][ C0] ? __sched_text_start+0x8/0x8 [ 343.628180][ C0] schedule+0xd9/0x260 [ 343.632227][ C0] schedule_timeout+0x486/0xc50 [ 343.637053][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 343.641970][ C0] ? usleep_range+0x170/0x170 [ 343.646628][ C0] ? trace_hardirqs_on+0x67/0x240 [ 343.651631][ C0] ? __kasan_check_read+0x11/0x20 [ 343.656635][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 343.662166][ C0] ? swake_up_one+0x60/0x60 [ 343.666649][ C0] ? trace_hardirqs_on+0x67/0x240 [ 343.671652][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 343.676395][ C0] ? rcu_barrier+0x310/0x310 [ 343.681049][ C0] ? trace_hardirqs_on+0x67/0x240 [ 343.686050][ C0] ? __kasan_check_read+0x11/0x20 [ 343.691060][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 343.697277][ C0] ? __kthread_parkme+0x108/0x1c0 [ 343.702277][ C0] ? __kasan_check_read+0x11/0x20 [ 343.707368][ C0] kthread+0x361/0x430 [ 343.711415][ C0] ? rcu_barrier+0x310/0x310 [ 343.715980][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 343.722215][ C0] ret_from_fork+0x24/0x30 [ 343.726641][ C0] NMI backtrace for cpu 0 [ 343.730963][ C0] CPU: 0 PID: 9752 Comm: syz-executor098 Not tainted 5.3.0-rc8+ #0 [ 343.738917][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 343.748966][ C0] Call Trace: [ 343.752242][ C0] [ 343.755152][ C0] dump_stack+0x172/0x1f0 [ 343.759466][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 343.764647][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 343.770866][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 343.776479][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 343.782449][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 343.788320][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 343.793409][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 343.798933][ C0] ? raise_softirq+0x138/0x340 [ 343.803677][ C0] update_process_times+0x32/0x80 [ 343.808684][ C0] tick_sched_handle+0xa2/0x190 [ 343.813513][ C0] tick_sched_timer+0x53/0x140 [ 343.818258][ C0] __hrtimer_run_queues+0x364/0xe40 [ 343.823436][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 343.828697][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 343.834218][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 343.839926][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 343.845979][ C0] hrtimer_interrupt+0x314/0x770 [ 343.850961][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 343.856496][ C0] apic_timer_interrupt+0xf/0x20 [ 343.861404][ C0] [ 343.864323][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x20/0x50 [ 343.870462][ C0] Code: ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 f4 88 8f 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b <8b> 90 f0 12 00 00 83 fa 02 75 20 48 8b 88 f8 12 00 00 8b 80 f4 12 [ 343.890040][ C0] RSP: 0018:ffff888097e57338 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 343.898427][ C0] RAX: ffff88808d232140 RBX: ffff8880a572ec38 RCX: ffffffff85c670f9 [ 343.906378][ C0] RDX: 0000000000000000 RSI: ffffffff85c66ad1 RDI: ffff8880a572ec40 [ 343.915280][ C0] RBP: ffff888097e57338 R08: ffff88808d232140 R09: 0000000000000000 [ 343.923227][ C0] R10: fffffbfff134afaf R11: ffff88808d232140 R12: dffffc0000000000 [ 343.931262][ C0] R13: ffff8880a572e940 R14: ffff8880a572ecd8 R15: ffff8880a572ecd0 [ 343.939278][ C0] ? hhf_dequeue+0x679/0xa20 [ 343.943858][ C0] ? hhf_dequeue+0x51/0xa20 [ 343.948348][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 343.954650][ C0] hhf_dequeue+0x51/0xa20 [ 343.959004][ C0] __qdisc_run+0x1e7/0x19d0 [ 343.963510][ C0] ? dev_queue_xmit+0x18/0x20 [ 343.968174][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 343.973210][ C0] ? netlink_sendmsg+0x8a5/0xd60 [ 343.978137][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 343.984357][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 343.989672][ C0] ? __copy_skb_header+0x2e8/0x550 [ 343.994768][ C0] ? __skb_checksum_complete+0x3f0/0x3f0 [ 344.000382][ C0] ? kasan_slab_alloc+0xf/0x20 [ 344.005123][ C0] ? __kasan_check_write+0x14/0x20 [ 344.010221][ C0] ? __skb_clone+0x5c8/0x820 [ 344.014790][ C0] dev_queue_xmit+0x18/0x20 [ 344.019268][ C0] ? dev_queue_xmit+0x18/0x20 [ 344.023944][ C0] netlink_deliver_tap+0x8e2/0xbf0 [ 344.029036][ C0] __netlink_sendskb+0x62/0xc0 [ 344.033783][ C0] netlink_unicast+0x60a/0x710 [ 344.038526][ C0] ? netlink_attachskb+0x7c0/0x7c0 [ 344.043616][ C0] netlink_ack+0x63f/0xb30 [ 344.048010][ C0] ? netlink_sendmsg+0xd60/0xd60 [ 344.052925][ C0] ? __copy_skb_header+0x250/0x550 [ 344.058015][ C0] netlink_rcv_skb+0x376/0x450 [ 344.062803][ C0] ? rtnetlink_put_metrics+0x580/0x580 [ 344.068239][ C0] ? netlink_ack+0xb30/0xb30 [ 344.072813][ C0] ? netlink_deliver_tap+0x254/0xbf0 [ 344.078076][ C0] rtnetlink_rcv+0x1d/0x30 [ 344.082472][ C0] netlink_unicast+0x531/0x710 [ 344.087216][ C0] ? netlink_attachskb+0x7c0/0x7c0 [ 344.092306][ C0] ? _copy_from_iter_full+0x25d/0x8a0 [ 344.097742][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 344.103440][ C0] ? __check_object_size+0x3d/0x437 [ 344.108626][ C0] netlink_sendmsg+0x8a5/0xd60 [ 344.113387][ C0] ? netlink_unicast+0x710/0x710 [ 344.118313][ C0] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 344.123841][ C0] ? apparmor_socket_sendmsg+0x2a/0x30 [ 344.129278][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.135499][ C0] ? security_socket_sendmsg+0x8d/0xc0 [ 344.140938][ C0] ? netlink_unicast+0x710/0x710 [ 344.145910][ C0] sock_sendmsg+0xd7/0x130 [ 344.150307][ C0] ___sys_sendmsg+0x803/0x920 [ 344.154976][ C0] ? copy_msghdr_from_user+0x440/0x440 [ 344.161198][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 344.167777][ C0] ? tomoyo_path_number_perm+0x263/0x520 [ 344.173392][ C0] ? sock_ioctl+0x489/0x780 [ 344.177874][ C0] ? dlci_ioctl_set+0x40/0x40 [ 344.182756][ C0] ? dlci_ioctl_set+0x40/0x40 [ 344.187613][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.193934][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.200153][ C0] ? __fget_light+0x1a9/0x230 [ 344.204810][ C0] ? __fdget+0x1b/0x20 [ 344.208858][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 344.215089][ C0] __sys_sendmsg+0x105/0x1d0 [ 344.219660][ C0] ? __sys_sendmsg_sock+0xd0/0xd0 [ 344.224668][ C0] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 344.230714][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 344.235457][ C0] do_syscall_64+0xfd/0x6a0 [ 344.239937][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 344.245806][ C0] RIP: 0033:0x441b09 [ 344.249685][ C0] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 344.269268][ C0] RSP: 002b:00007fff54c46b68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 344.277658][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441b09 [ 344.285606][ C0] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 [ 344.293568][ C0] RBP: 00007fff54c46b80 R08: 0000000001bbbbbb R09: 0000000001bbbbbb [ 344.301519][ C0] R10: 0000000001bbbbbb R11: 0000000000000246 R12: 0000000000000000 [ 344.309469][ C0] R13: 00000000004030a0 R14: 0000000000000000 R15: 0000000000000000