[....] 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. [ 65.797939][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.797950][ T26] audit: type=1800 audit(1568548334.642:29): pid=9714 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 [ 65.835753][ T26] audit: type=1800 audit(1568548334.642:30): pid=9714 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 '10.128.0.195' (ECDSA) to the list of known hosts. syzkaller login: [ 226.617990][ T9865] IPVS: ftp: loaded support on port[0] = 21 [ 226.661414][ T9865] chnl_net:caif_netlink_parms(): no params data found [ 226.684040][ T9865] bridge0: port 1(bridge_slave_0) entered blocking state [ 226.691548][ T9865] bridge0: port 1(bridge_slave_0) entered disabled state [ 226.699197][ T9865] device bridge_slave_0 entered promiscuous mode [ 226.706458][ T9865] bridge0: port 2(bridge_slave_1) entered blocking state [ 226.713546][ T9865] bridge0: port 2(bridge_slave_1) entered disabled state [ 226.721340][ T9865] device bridge_slave_1 entered promiscuous mode [ 226.736538][ T9865] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 226.746638][ T9865] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 226.762376][ T9865] team0: Port device team_slave_0 added [ 226.769706][ T9865] team0: Port device team_slave_1 added [ 226.827836][ T9865] device hsr_slave_0 entered promiscuous mode [ 226.876478][ T9865] device hsr_slave_1 entered promiscuous mode [ 226.941373][ T9865] bridge0: port 2(bridge_slave_1) entered blocking state [ 226.948604][ T9865] bridge0: port 2(bridge_slave_1) entered forwarding state [ 226.958350][ T9865] bridge0: port 1(bridge_slave_0) entered blocking state [ 226.965534][ T9865] bridge0: port 1(bridge_slave_0) entered forwarding state [ 226.990340][ T9865] 8021q: adding VLAN 0 to HW filter on device bond0 [ 227.000799][ T3020] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 227.020271][ T3020] bridge0: port 1(bridge_slave_0) entered disabled state [ 227.028101][ T3020] bridge0: port 2(bridge_slave_1) entered disabled state [ 227.035780][ T3020] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 227.047082][ T9865] 8021q: adding VLAN 0 to HW filter on device team0 [ 227.057844][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 227.066235][ T9867] bridge0: port 1(bridge_slave_0) entered blocking state [ 227.073288][ T9867] bridge0: port 1(bridge_slave_0) entered forwarding state [ 227.080905][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 227.089734][ T9867] bridge0: port 2(bridge_slave_1) entered blocking state [ 227.096808][ T9867] bridge0: port 2(bridge_slave_1) entered forwarding state [ 227.115487][ T9865] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 227.126591][ T9865] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 227.138691][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 227.147107][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 227.155292][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 227.163753][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 227.172293][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 227.180287][ T9867] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 227.193907][ T9865] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 227.236714][ C0] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 389.576287][ T1057] INFO: task syz-executor834:9865 blocked for more than 143 seconds. [ 389.584416][ T1057] Not tainted 5.3.0-rc8+ #0 [ 389.589484][ T1057] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 389.598181][ T1057] syz-executor834 D24512 9865 9864 0x00004000 [ 389.604507][ T1057] Call Trace: [ 389.607833][ T1057] __schedule+0x755/0x1580 [ 389.612277][ T1057] ? __sched_text_start+0x8/0x8 [ 389.617144][ T1057] ? finish_task_switch+0x147/0x720 [ 389.622337][ T1057] schedule+0xd9/0x260 [ 389.626725][ T1057] schedule_timeout+0x717/0xc50 [ 389.632258][ T1057] ? trace_hardirqs_on+0x67/0x240 [ 389.641406][ T1057] ? usleep_range+0x170/0x170 [ 389.646109][ T1057] ? __kasan_check_write+0x14/0x20 [ 389.651824][ T1057] ? lock_downgrade+0x920/0x920 [ 389.656687][ T1057] ? rwlock_bug.part.0+0x90/0x90 [ 389.661615][ T1057] ? wait_for_completion+0x9e/0x440 [ 389.666843][ T1057] ? trace_hardirqs_on+0x67/0x240 [ 389.671858][ T1057] ? __kasan_check_read+0x11/0x20 [ 389.676897][ T1057] wait_for_completion+0x29c/0x440 [ 389.682086][ T1057] ? wait_for_completion_interruptible+0x470/0x470 [ 389.688633][ T1057] ? wake_up_q+0xf0/0xf0 [ 389.693750][ T1057] ? rcu_read_unlock_special+0x102/0x740 [ 389.699507][ T1057] __flush_work+0x508/0xa50 [ 389.704259][ T1057] ? __kernel_text_address+0xd/0x40 [ 389.709493][ T1057] ? alloc_unbound_pwq+0xcb0/0xcb0 [ 389.714595][ T1057] ? init_pwq+0x360/0x360 [ 389.718944][ T1057] ? __cancel_work_timer+0xc4/0x540 [ 389.724140][ T1057] ? trace_hardirqs_off+0x62/0x240 [ 389.729730][ T1057] ? trace_hardirqs_on+0x67/0x240 [ 389.734773][ T1057] __cancel_work_timer+0x3d9/0x540 [ 389.739901][ T1057] ? mod_delayed_work_on+0x200/0x200 [ 389.745179][ T1057] ? debug_object_active_state+0x28a/0x350 [ 389.751008][ T1057] ? __kasan_check_read+0x11/0x20 [ 389.756540][ T1057] ? __kasan_check_write+0x14/0x20 [ 389.761636][ T1057] ? lock_downgrade+0x920/0x920 [ 389.766505][ T1057] ? mark_held_locks+0xf0/0xf0 [ 389.771260][ T1057] cancel_delayed_work_sync+0x1b/0x20 [ 389.776661][ T1057] tls_sw_cancel_work_tx+0x68/0x80 [ 389.781781][ T1057] tls_sk_proto_close+0x4ac/0x990 [ 389.786821][ T1057] ? lock_acquire+0x190/0x410 [ 389.791490][ T1057] ? wait_on_pending_writer+0x420/0x420 [ 389.797047][ T1057] ? ip_mc_drop_socket+0x211/0x270 [ 389.802760][ T1057] ? down_write+0xdf/0x150 [ 389.807207][ T1057] inet_release+0xed/0x200 [ 389.811633][ T1057] inet6_release+0x53/0x80 [ 389.816124][ T1057] __sock_release+0xce/0x280 [ 389.820883][ T1057] sock_close+0x1e/0x30 [ 389.825017][ T1057] __fput+0x2ff/0x890 [ 389.829027][ T1057] ? __sock_release+0x280/0x280 [ 389.833870][ T1057] ____fput+0x16/0x20 [ 389.837872][ T1057] task_work_run+0x145/0x1c0 [ 389.842461][ T1057] exit_to_usermode_loop+0x316/0x380 [ 389.847890][ T1057] do_syscall_64+0x5a9/0x6a0 [ 389.852531][ T1057] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 389.858468][ T1057] RIP: 0033:0x401f40 [ 389.862451][ T1057] Code: ff ff ff 25 62 63 20 00 68 08 00 00 00 e9 60 ff ff ff ff 25 5a 63 20 00 68 09 00 00 00 e9 50 ff ff ff ff 25 52 63 20 00 68 0a <00> 00 00 e9 40 ff ff ff ff 25 4a 63 20 00 68 0b 00 00 00 e9 30 ff [ 389.882100][ T1057] RSP: 002b:00007ffdfc56ff18 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 389.890865][ T1057] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000401f40 [ 389.898863][ T1057] RDX: ffffffffffffffc1 RSI: 1201000000003618 RDI: 0000000000000004 [ 389.906859][ T1057] RBP: 00007ffdfc56ff30 R08: 0000000000000000 R09: 1201000000003618 [ 389.914808][ T1057] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 389.922792][ T1057] R13: 0000000000403170 R14: 0000000000000000 R15: 0000000000000000 [ 389.930795][ T1057] INFO: lockdep is turned off. [ 389.935534][ T1057] NMI backtrace for cpu 1 [ 389.939877][ T1057] CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc8+ #0 [ 389.947578][ T1057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 389.957622][ T1057] Call Trace: [ 389.960893][ T1057] dump_stack+0x172/0x1f0 [ 389.965199][ T1057] nmi_cpu_backtrace.cold+0x70/0xb2 [ 389.970384][ T1057] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 389.976634][ T1057] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 389.982246][ T1057] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 389.988419][ T1057] arch_trigger_cpumask_backtrace+0x14/0x20 [ 389.994300][ T1057] watchdog+0x9d0/0xef0 [ 389.998436][ T1057] kthread+0x361/0x430 [ 390.002478][ T1057] ? reset_hung_task_detector+0x30/0x30 [ 390.008020][ T1057] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 390.014245][ T1057] ret_from_fork+0x24/0x30 [ 390.018750][ T1057] Sending NMI from CPU 1 to CPUs 0: [ 390.023985][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 390.025245][ T1057] Kernel panic - not syncing: hung_task: blocked tasks [ 390.039054][ T1057] CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc8+ #0 [ 390.046495][ T1057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 390.056537][ T1057] Call Trace: [ 390.059829][ T1057] dump_stack+0x172/0x1f0 [ 390.064139][ T1057] panic+0x2dc/0x755 [ 390.068020][ T1057] ? add_taint.cold+0x16/0x16 [ 390.072687][ T1057] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 390.078309][ T1057] ? ___preempt_schedule+0x16/0x20 [ 390.083397][ T1057] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 390.089524][ T1057] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 390.096612][ T1057] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 390.102740][ T1057] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 390.108872][ T1057] watchdog+0x9e1/0xef0 [ 390.113148][ T1057] kthread+0x361/0x430 [ 390.117221][ T1057] ? reset_hung_task_detector+0x30/0x30 [ 390.122753][ T1057] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 390.128970][ T1057] ret_from_fork+0x24/0x30 [ 390.134730][ T1057] Kernel Offset: disabled [ 390.139060][ T1057] Rebooting in 86400 seconds..